/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.hdfs.server.namenode;
import org.apache.commons.logging.*;
import org.apache.hadoop.conf.*;
import org.apache.hadoop.hdfs.DFSUtil;
import org.apache.hadoop.hdfs.util.LightWeightHashSet;
import org.apache.hadoop.hdfs.util.PathValidator;
import org.apache.hadoop.hdfs.protocol.*;
import org.apache.hadoop.hdfs.server.common.GenerationStamp;
import org.apache.hadoop.hdfs.server.common.HdfsConstants;
import org.apache.hadoop.hdfs.server.common.HdfsConstants.StartupOption;
import org.apache.hadoop.hdfs.server.common.Storage;
import org.apache.hadoop.hdfs.server.common.UpgradeStatusReport;
import org.apache.hadoop.hdfs.server.namenode.BlocksMap.BlockInfo;
import org.apache.hadoop.hdfs.server.namenode.ClusterJspHelper.NameNodeKey;
import org.apache.hadoop.hdfs.server.namenode.DatanodeDescriptor.DecommissioningStatus;
import org.apache.hadoop.hdfs.server.namenode.DecommissionManager.Monitor;
import org.apache.hadoop.hdfs.server.namenode.metrics.FSNamesystemMBean;
import org.apache.hadoop.hdfs.server.namenode.metrics.FSNamesystemMetrics;
import org.apache.hadoop.security.AccessControlException;
import org.apache.hadoop.security.PermissionChecker;
import org.apache.hadoop.security.UnixUserGroupInformation;
import org.apache.hadoop.security.UserGroupInformation;
import org.apache.hadoop.util.*;
import org.apache.hadoop.metrics.util.MBeanUtil;
import org.apache.hadoop.net.CachedDNSToSwitchMapping;
import org.apache.hadoop.net.DNSToSwitchMapping;
import org.apache.hadoop.net.NetworkTopology;
import org.apache.hadoop.net.Node;
import org.apache.hadoop.net.NodeBase;
import org.apache.hadoop.net.ScriptBasedMapping;
import org.apache.hadoop.hdfs.server.namenode.LeaseManager.Lease;
import org.apache.hadoop.hdfs.server.namenode.UnderReplicatedBlocks.BlockIterator;
import org.apache.hadoop.hdfs.server.protocol.BlockAlreadyCommittedException;
import org.apache.hadoop.hdfs.server.protocol.BlockCommand;
import org.apache.hadoop.hdfs.server.protocol.BlockReport;
import org.apache.hadoop.hdfs.server.protocol.BlocksWithLocations;
import org.apache.hadoop.hdfs.server.protocol.BlocksWithLocations.BlockWithLocations;
import org.apache.hadoop.hdfs.server.protocol.BlockFlags;
import org.apache.hadoop.hdfs.server.protocol.DatanodeCommand;
import org.apache.hadoop.hdfs.server.protocol.DatanodeRegistration;
import org.apache.hadoop.hdfs.server.protocol.DisallowedDatanodeException;
import org.apache.hadoop.hdfs.server.protocol.IncrementalBlockReport;
import org.apache.hadoop.hdfs.server.protocol.NamespaceInfo;
import org.apache.hadoop.hdfs.server.protocol.ReceivedDeletedBlockInfo;
import org.apache.hadoop.hdfs.server.protocol.UpgradeCommand;
import org.apache.hadoop.hdfs.util.LightWeightLinkedSet;
import org.apache.hadoop.hdfs.FileStatusExtended;
import org.apache.hadoop.hdfs.OpenFilesInfo;
import org.apache.hadoop.fs.ContentSummary;
import org.apache.hadoop.fs.FileAlreadyExistsException;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.OpenFileInfo;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.permission.*;
import org.apache.hadoop.ipc.ProtocolSignature;
import org.apache.hadoop.ipc.Server;
import org.apache.hadoop.io.IOUtils;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.InterruptedIOException;
import java.io.PrintWriter;
import java.io.DataOutputStream;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.URL;
import java.net.URLConnection;
import java.util.*;
import java.util.Map.Entry;
import java.util.concurrent.locks.ReentrantReadWriteLock;
import java.lang.management.ManagementFactory;
import javax.management.NotCompliantMBeanException;
import javax.management.ObjectName;
import javax.management.ObjectInstance;
import javax.management.StandardMBean;
import javax.security.auth.login.LoginException;
import org.mortbay.util.ajax.JSON;
import javax.management.MBeanServer;
/**
* ************************************************
* FSNamesystem does the actual bookkeeping work for the
* DataNode.
* <p/>
* It tracks several important tables.
* <p/>
* 1) valid fsname --> blocklist (kept on disk, logged)
* 2) Set of all valid blocks (inverted #1)
* 3) block --> machinelist (kept in memory, rebuilt dynamically from reports)
* 4) machine --> blocklist (inverted #2)
* 5) LRU cache of updated-heartbeat machines
* *************************************************
*/
public class FSNamesystem extends ReconfigurableBase
implements FSConstants, FSNamesystemMBean, FSClusterStats,
NameNodeMXBean {
public static final Log LOG = LogFactory.getLog(FSNamesystem.class);
public static int BLOCK_DELETION_INCREMENT = 1000;
public static final String AUDIT_FORMAT =
"ugi=%s\t" + // ugi
"ip=%s\t" + // remote IP
"cmd=%s\t" + // command
"src=%s\t" + // src path
"dst=%s\t" + // dst path (optional)
"perm=%s"; // permissions (optional)
private static final ThreadLocal<Formatter> auditFormatter =
new ThreadLocal<Formatter>() {
protected Formatter initialValue() {
return new Formatter(new StringBuilder(AUDIT_FORMAT.length() * 4));
}
};
private static final ThreadLocal<StringBuilder> auditStringBuilder =
new ThreadLocal<StringBuilder>() {
protected StringBuilder initialValue() {
return new StringBuilder(AUDIT_FORMAT.length() * 4);
}
};
private static final void logAuditEvent(UserGroupInformation ugi,
InetAddress addr, String cmd, String src, String dst,
INode node) {
final StringBuilder builder = auditStringBuilder.get();
builder.setLength(0);
builder.append("ugi=").append(ugi).append("\t").
append("ip=").append(addr).append("\t").
append("cmd=").append(cmd).append("\t").
append("src=").append(src).append("\t").
append("dst=").append(dst).append("\t").
append("perm=");
if (node == null) {
builder.append("null");
} else {
builder.append(node.getUserName() + ':' +
node.getGroupName() + ':' + node.getFsPermission());
}
auditLog.info(builder.toString());
}
public static final Log auditLog = LogFactory.getLog(
FSNamesystem.class.getName() + ".audit");
// Default initial capacity and load factor of map
public static final int DEFAULT_INITIAL_MAP_CAPACITY = 16;
public static final float DEFAULT_MAP_LOAD_FACTOR = 0.75f;
public static final int DEFAULT_MAX_CORRUPT_FILEBLOCKS_RETURNED = 500;
private boolean isPermissionEnabled;
private boolean persistBlocks;
private UserGroupInformation fsOwner;
private String supergroup;
private PermissionStatus defaultPermission;
// FSNamesystemMetrics counter variables
private FSNamesystemMetrics myFSMetrics;
private long capacityTotal = 0L, capacityUsed = 0L, capacityRemaining = 0L, capacityNamespaceUsed = 0L;
private int totalLoad = 0;
// number of datanodes that have reported (used during safemode only)
private int dnReporting = 0;
volatile long pendingReplicationBlocksCount = 0L;
volatile long corruptReplicaBlocksCount = 0L;
volatile long underReplicatedBlocksCount = 0L;
volatile long numInvalidFilePathOperations = 0L;
volatile long scheduledReplicationBlocksCount = 0L;
volatile long excessBlocksCount = 0L;
volatile long pendingDeletionBlocksCount = 0L;
volatile long upgradeStartTime = 0L;
//
// Stores the correct file name hierarchy
//
public FSDirectory dir;
//
// Mapping: Block -> { INode, datanodes, self ref }
// Updated only in response to client-sent information.
//
final BlocksMap blocksMap = new BlocksMap(DEFAULT_INITIAL_MAP_CAPACITY,
DEFAULT_MAP_LOAD_FACTOR, this);
//
// Store blocks-->datanodedescriptor(s) map of corrupt replicas
//
public CorruptReplicasMap corruptReplicas = new CorruptReplicasMap();
/**
* Stores the datanode -> block map.
* <p/>
* Done by storing a set of {@link DatanodeDescriptor} objects, sorted by
* storage id. In order to keep the storage map consistent it tracks
* all storages ever registered with the namenode.
* A descriptor corresponding to a specific storage id can be
* <ul>
* <li>added to the map if it is a new storage id;</li>
* <li>updated with a new datanode started as a replacement for the old one
* with the same storage id; and </li>
* <li>removed if and only if an existing datanode is restarted to serve a
* different storage id.</li>
* </ul> <br>
* The list of the {@link DatanodeDescriptor}s in the map is checkpointed
* in the namespace image file. Only the {@link DatanodeInfo} part is
* persistent, the list of blocks is restored from the datanode block
* reports.
* <p/>
* Mapping: StorageID -> DatanodeDescriptor
*/
NavigableMap<String, DatanodeDescriptor> datanodeMap =
new TreeMap<String, DatanodeDescriptor>();
//
// Keeps a Collection for every named machine containing
// blocks that have recently been invalidated and are thought to live
// on the machine in question.
// Mapping: StorageID -> ArrayList<Block>
//
private Map<String, LightWeightHashSet<Block>> recentInvalidateSets =
new TreeMap<String, LightWeightHashSet<Block>>();
//
// Keeps a TreeSet for every named node. Each treeset contains
// a list of the blocks that are "extra" at that location. We'll
// eventually remove these extras.
// Mapping: StorageID -> TreeSet<Block>
//
Map<String, Collection<Block>> excessReplicateMap =
new TreeMap<String, Collection<Block>>();
Random r = new Random();
/**
* Stores a set of DatanodeDescriptor objects.
* This is a subset of {@link #datanodeMap}, containing nodes that are
* considered alive.
* The {@link HeartbeatMonitor} periodically checks for outdated entries,
* and removes them from the list.
*/
ArrayList<DatanodeDescriptor> heartbeats = new ArrayList<DatanodeDescriptor>();
//
// Store set of Blocks that need to be replicated 1 or more times.
// We also store pending replication-orders.
// Set of: Block
//
private UnderReplicatedBlocks neededReplications = new UnderReplicatedBlocks();
private PendingReplicationBlocks pendingReplications;
// list of blocks that need to be checked for possible overreplication
private LightWeightLinkedSet<Block> overReplicatedBlocks = new LightWeightLinkedSet<Block>();
public LeaseManager leaseManager = new LeaseManager(this);
//
// Threaded object that checks to see if we have been
// getting heartbeats from all clients.
//
Daemon hbthread = null; // HeartbeatMonitor thread
public Daemon lmthread = null; // LeaseMonitor thread
Daemon smmthread = null; // SafeModeMonitor thread
public Daemon underreplthread = null; // Replication thread for under replicated blocks
public Daemon overreplthread = null; // Replication thread for over replicated blocks
private volatile boolean fsRunning = true;
long systemStart = 0;
// The maximum number of replicates we should allow for a single block
private int maxReplication;
// How many outgoing replication streams a given node should have at one time
private int maxReplicationStreams;
// MIN_REPLICATION is how many copies we need in place or else we disallow the write
private int minReplication;
// Min replication for closing a file
private int minCloseReplication;
// Default replication
private int defaultReplication;
// Variable to stall new replication checks for testing purposes
private volatile boolean stallReplicationWork = false;
// How many entries are returned by getCorruptInodes()
int maxCorruptFilesReturned;
// How many blocks (heartbeats.size() * multiplier) are replicated in a round
private float replicationWorkMultiplier;
// heartbeat interval from configuration
long heartbeatInterval;
// heartbeatRecheckInterval is how often namenode checks for expired datanodes
long heartbeatRecheckInterval;
// heartbeatExpireInterval is how long namenode waits for datanode to report
// heartbeat
private long heartbeatExpireInterval;
// underReplicationRecheckInterval is how often namenode checks for new under replication work
private long underReplicationRecheckInterval;
// overReplicationRecheckInterval is how often namenode checks for new over replication work
private long overReplicationRecheckInterval;
// default block size of a file
private long defaultBlockSize = 0;
// allow appending to hdfs files
private boolean supportAppends = true;
/**
* Last block index used for replication work per priority
*/
private int[] replIndex = new int[UnderReplicatedBlocks.LEVEL];
/**
* NameNode RPC address
*/
private InetSocketAddress nameNodeAddress = null; // TODO: name-node has this field, it should be removed here
private NameNode nameNode = null;
private SafeModeInfo safeMode; // safe mode information
private Host2NodesMap host2DataNodeMap = new Host2NodesMap();
// datanode networktoplogy
NetworkTopology clusterMap = null;
DNSToSwitchMapping dnsToSwitchMapping;
// for block replicas placement
BlockPlacementPolicy replicator;
private boolean syncAddBlock;
private HostsFileReader hostsReader;
private Daemon dnthread = null;
private long maxFsObjects = 0; // maximum number of fs objects
/**
* The global generation stamp for this file system.
*/
private final GenerationStamp generationStamp = new GenerationStamp();
// Ask Datanode only up to this many blocks to delete.
int blockInvalidateLimit;
// precision of access times.
private long accessTimePrecision = 0;
// lock to protect FSNamesystem.
private ReentrantReadWriteLock fsLock;
boolean hasRwLock = false; // shall we use read/write locks?
// do not use manual override to exit safemode
volatile boolean manualOverrideSafeMode = false;
private PathValidator pathValidator;
// Permission violations only result in entries in the namenode log.
// The operation does not actually fail.
private boolean permissionAuditOnly = false;
// set of absolute path names that cannot be deleted
Set<String> neverDeletePaths = new TreeSet<String>();
// dynamic loading of config files
private ConfigManager configManager;
/** Denotes the number of safe blocks during safe mode */
protected long blocksSafe = 0;
/** flag indicating whether replication queues have been initialized */
protected boolean initializedReplQueues = false;
/**
* FSNamesystem constructor.
*/
FSNamesystem(NameNode nn, Configuration conf) throws IOException {
super(conf);
try {
clusterMap = new NetworkTopology(conf);
initialize(nn, getConf());
pathValidator = new PathValidator(conf);
} catch (IOException e) {
LOG.error(getClass().getSimpleName() + " initialization failed.", e);
close();
throw e;
}
}
/**
* For testing.
*/
FSNamesystem() {
}
/**
* Initialize FSNamesystem.
*/
private void initialize(NameNode nn, Configuration conf) throws IOException {
// Register MBean first since pedingReplication refers to myFSMetrics
this.registerMBean(conf); // register the MBean for the FSNamesystemStutus
// This needs to be initialized first, since it is referenced by other
// operations in the initialization.
pendingReplications = new PendingReplicationBlocks(
conf.getInt("dfs.replication.pending.timeout.sec",
-1) * 1000L, myFSMetrics);
this.systemStart = now();
this.fsLock = new ReentrantReadWriteLock(); // non-fair
configManager = new ConfigManager(this, conf);
setConfigurationParameters(conf);
// This can be null if two ports are running. Should not rely on the value.
// The getter for this is deprecated
this.nameNodeAddress = nn.getNameNodeAddress();
this.nameNode = nn;
this.dir = new FSDirectory(this, conf);
StartupOption startOpt = NameNode.getStartupOption(conf);
this.dir.loadFSImage(getNamespaceDirs(conf),
getNamespaceEditsDirs(conf), startOpt);
long timeTakenToLoadFSImage = now() - systemStart;
LOG.info("Finished loading FSImage in " + timeTakenToLoadFSImage + " msecs");
NameNode.getNameNodeMetrics().fsImageLoadTime.set(
(int) timeTakenToLoadFSImage);
this.safeMode = SafeModeUtil.getInstance(conf, this);
this.safeMode.checkMode();
if ("true".equals(conf.get("dfs.namenode.initialize.counting"))) {
LOG.info("Start counting items in the file tree");
dir.rootDir.countItems();
LOG.info("Finish counting items in the file tree");
INodeDirectory.ItemCounts counts = dir.rootDir.getItemCounts();
LOG.info("Counting result: " +
counts.numDirectories + " directories, " +
counts.numFiles + " files, and " +
counts.numBlocks + " blocks in file tree. " +
blocksMap.size() + " blocks in block map.");
} else {
LOG.info("Skip counting items in the file tree");
}
// initialize heartbeat & leasemanager threads
this.hbthread = new Daemon(new HeartbeatMonitor());
this.lmthread = new Daemon(leaseManager.new Monitor());
// start heartbeat & leasemanager threads
hbthread.start();
lmthread.start();
// initialize replication threads
this.underreplthread = new Daemon(new UnderReplicationMonitor());
this.overreplthread = new Daemon(new OverReplicationMonitor());
// start replication threds
underreplthread.start();
overreplthread.start();
this.hostsReader = new HostsFileReader(conf.get("dfs.hosts", ""),
conf.get("dfs.hosts.exclude", ""));
this.dnthread = new Daemon(new DecommissionManager(this).new Monitor(
conf.getInt("dfs.namenode.decommission.interval", 30),
conf.getInt("dfs.namenode.decommission.nodes.per.interval", 5)));
dnthread.start();
this.dnsToSwitchMapping = ReflectionUtils.newInstance(
conf.getClass("topology.node.switch.mapping.impl", ScriptBasedMapping.class,
DNSToSwitchMapping.class), conf);
/* If the dns to swith mapping supports cache, resolve network
* locations of those hosts in the include list,
* and store the mapping in the cache; so future calls to resolve
* will be fast.
*/
if (dnsToSwitchMapping instanceof CachedDNSToSwitchMapping) {
dnsToSwitchMapping.resolve(new ArrayList<String>(hostsReader.getHostNames()));
}
this.replicator = BlockPlacementPolicy.getInstance(
conf,
this,
this.clusterMap,
this.hostsReader,
this.dnsToSwitchMapping,
this);
this.registerMXBean();
// Whether or not to sync each addBlock() operation to the edit log.
this.syncAddBlock = conf.getBoolean("dfs.sync.on.every.addblock", false);
}
public static Collection<File> getNamespaceDirs(Configuration conf) {
Collection<String> dirNames = conf.getStringCollection("dfs.name.dir");
if (dirNames.isEmpty()) {
dirNames.add("/tmp/hadoop/dfs/name");
}
Collection<File> dirs = new ArrayList<File>(dirNames.size());
for (String name : dirNames) {
dirs.add(new File(name));
}
return dirs;
}
public static Collection<File> getNamespaceEditsDirs(Configuration conf) {
Collection<String> editsDirNames =
conf.getStringCollection("dfs.name.edits.dir");
if (editsDirNames.isEmpty()) {
editsDirNames.add("/tmp/hadoop/dfs/name");
}
Collection<File> dirs = new ArrayList<File>(editsDirNames.size());
for (String name : editsDirNames) {
dirs.add(new File(name));
}
return dirs;
}
/**
* dirs is a list of directories where the filesystem directory state
* is stored
*/
FSNamesystem(FSImage fsImage, Configuration conf) throws IOException {
super(conf);
this.clusterMap = new NetworkTopology(conf);
this.fsLock = new ReentrantReadWriteLock();
setConfigurationParameters(conf);
this.dir = new FSDirectory(fsImage, this, conf);
}
// utility methods to acquire and release read lock and write lock
// If hasRwLock is false, then a readLock actually turns into write lock.
void readLock() {
if (this.hasRwLock) {
this.fsLock.readLock().lock();
} else {
writeLock();
}
}
void readUnlock() {
if (this.hasRwLock) {
this.fsLock.readLock().unlock();
} else {
writeUnlock();
}
}
void writeLock() {
this.fsLock.writeLock().lock();
}
void writeUnlock() {
this.fsLock.writeLock().unlock();
}
boolean hasWriteLock() {
return this.fsLock.isWriteLockedByCurrentThread();
}
/**
* Set parameters derived from heartbeat interval.
*/
private void setHeartbeatInterval(long heartbeatInterval,
long heartbeatRecheckInterval) {
this.heartbeatInterval = heartbeatInterval;
this.heartbeatRecheckInterval = heartbeatRecheckInterval;
this.heartbeatExpireInterval = 2 * heartbeatRecheckInterval +
10 * heartbeatInterval;
this.blockInvalidateLimit =
Math.max(this.blockInvalidateLimit,
20 * (int) (heartbeatInterval/1000L));
}
/**
* Initializes some of the members from configuration
*/
private void setConfigurationParameters(Configuration conf)
throws IOException {
if (conf.getBoolean("hadoop.disable.shell", false)) {
conf.setStrings(UnixUserGroupInformation.UGI_PROPERTY_NAME, new String[]{"hadoop", "hadoop"});
Shell.setDisabled(true);
}
try {
fsOwner = UnixUserGroupInformation.login(conf);
} catch (LoginException e) {
throw new IOException(StringUtils.stringifyException(e));
}
LOG.info("fsOwner=" + fsOwner);
this.hasRwLock = conf.getBoolean("dfs.rwlock", false);
this.supergroup = conf.get("dfs.permissions.supergroup", "supergroup");
this.isPermissionEnabled = conf.getBoolean("dfs.permissions", true);
this.setPersistBlocks(conf.getBoolean("dfs.persist.blocks", false));
LOG.info("supergroup=" + supergroup);
LOG.info("isPermissionEnabled=" + isPermissionEnabled);
short filePermission = (short) conf.getInt("dfs.upgrade.permission", 0777);
this.defaultPermission = PermissionStatus.createImmutable(
fsOwner.getUserName(), supergroup, new FsPermission(filePermission));
this.maxCorruptFilesReturned = conf.getInt("dfs.corruptfilesreturned.max",
DEFAULT_MAX_CORRUPT_FILEBLOCKS_RETURNED);
this.defaultReplication = conf.getInt("dfs.replication", 3);
this.maxReplication = conf.getInt("dfs.replication.max", 512);
this.minReplication = conf.getInt("dfs.replication.min", 1);
this.minCloseReplication = conf.getInt("dfs.close.replication.min",
minReplication);
if (minReplication <= 0) {
throw new IOException(
"Unexpected configuration parameters: dfs.replication.min = "
+ minReplication
+ " must be greater than 0");
}
if (maxReplication >= (int) Short.MAX_VALUE) {
throw new IOException(
"Unexpected configuration parameters: dfs.replication.max = "
+ maxReplication + " must be less than " + (Short.MAX_VALUE));
}
if (maxReplication < minReplication) {
throw new IOException(
"Unexpected configuration parameters: dfs.replication.min = "
+ minReplication
+ " must be less than dfs.replication.max = "
+ maxReplication);
}
if (minCloseReplication < minReplication) {
throw new IOException(
"Unexpected configuration parameters: dfs.close.replication.min = "
+ minCloseReplication
+ " must be no less than dfs.replication.min = "
+ minReplication);
}
if (minCloseReplication > maxReplication) {
throw new IOException(
"Unexpected configuration paramerters: dfs.close.replication.min = "
+ minCloseReplication
+ " must be no greater than dfs.replication.max = "
+ maxReplication);
}
blockInvalidateLimit = conf.getInt("dfs.block.invalidate.limit",
FSConstants.BLOCK_INVALIDATE_CHUNK);
this.maxReplicationStreams = conf.getInt("dfs.max-repl-streams", 2);
this.replicationWorkMultiplier =
conf.getFloat("dfs.replication.iteration.multiplier",
UnderReplicationMonitor.REPLICATION_WORK_MULTIPLIER_PER_ITERATION);
long heartbeatInterval = conf.getLong("dfs.heartbeat.interval", 3) * 1000;
long heartbeatRecheckInterval = conf.getInt(
"heartbeat.recheck.interval", 5 * 60 * 1000); // 5 minutes
setHeartbeatInterval(heartbeatInterval, heartbeatRecheckInterval);
this.underReplicationRecheckInterval =
conf.getInt("dfs.replication.interval", 3) * 1000L;
this.overReplicationRecheckInterval = 2 * underReplicationRecheckInterval;
this.defaultBlockSize = conf.getLong("dfs.block.size", DEFAULT_BLOCK_SIZE);
this.maxFsObjects = conf.getLong("dfs.max.objects", 0);
this.accessTimePrecision = conf.getLong("dfs.access.time.precision", 0);
this.supportAppends = conf.getBoolean("dfs.support.append", false);
long editPreallocateSize = conf.getLong("dfs.edit.preallocate.size",
HdfsConstants.DEFAULT_EDIT_PREALLOCATE_SIZE);
FSEditLog.setPreallocateSize(editPreallocateSize);
int editBufferSize = conf.getInt("dfs.edit.buffer.size",
HdfsConstants.DEFAULT_EDIT_BUFFER_SIZE);
FSEditLog.setBufferCapacity(editBufferSize);
int maxBufferedTransactions = conf.getInt("dfs.max.buffered.transactions",
HdfsConstants.DEFAULT_MAX_BUFFERED_TRANSACTIONS);
FSEditLog.setMaxBufferedTransactions(maxBufferedTransactions);
// Permission violations are logged in the namenode logs. The operation
// does not fail.
this.permissionAuditOnly = conf.getBoolean("dfs.permissions.audit.log", false);
// set soft and hard lease period
long hardLeaseLimit = conf.getLong(FSConstants.DFS_HARD_LEASE_KEY,
FSConstants.LEASE_HARDLIMIT_PERIOD);
long softLeaseLimit = conf.getLong(FSConstants.DFS_SOFT_LEASE_KEY,
FSConstants.LEASE_SOFTLIMIT_PERIOD);
this.leaseManager.setLeasePeriod(
Math.min(hardLeaseLimit, softLeaseLimit), hardLeaseLimit);
}
/**
* Return the default path permission when upgrading from releases with no
* permissions (<=0.15) to releases with permissions (>=0.16)
*/
protected PermissionStatus getUpgradePermission() {
return defaultPermission;
}
NamespaceInfo getNamespaceInfo() {
writeLock();
try {
return new NamespaceInfo(dir.fsImage.getNamespaceID(),
dir.fsImage.getCTime(),
getDistributedUpgradeVersion());
} finally {
writeUnlock();
}
}
/**
* Retrieves a list of random files with some information.
*
* @param maxFiles
* the maximum number of files to return
* @return the list of files
*/
public List<FileStatusExtended> getRandomFiles(int maxFiles) {
return dir.getRandomFileStats(maxFiles);
}
public OpenFilesInfo getOpenFiles() throws IOException {
List <FileStatusExtended> openFiles = new ArrayList <FileStatusExtended>();
for (Lease lease : leaseManager.getSortedLeases()) {
for (String path : lease.getPaths()) {
FileStatusExtended stat = this.getFileInfoExtended(path,
lease.getHolder());
if (stat != null) {
openFiles.add(stat);
}
}
}
return new OpenFilesInfo(openFiles, this.getGenerationStamp());
}
/**
* Close down this file system manager.
* Causes heartbeat and lease daemons to stop; waits briefly for
* them to finish, but a short timeout returns control back to caller.
*/
public void close() {
fsRunning = false;
try {
if (pendingReplications != null) {
pendingReplications.stop();
}
if (hbthread != null) {
hbthread.interrupt();
}
if (underreplthread != null) {
underreplthread.interrupt();
}
if (overreplthread != null) {
overreplthread.interrupt();
}
if (dnthread != null) {
dnthread.interrupt();
}
if (safeMode != null) {
safeMode.shutdown();
}
} catch (Exception e) {
LOG.warn("Exception shutting down FSNamesystem", e);
} finally {
// using finally to ensure we also wait for lease daemon
try {
if (lmthread != null) {
lmthread.interrupt();
lmthread.join(3000);
}
if (getConf().getBoolean("dfs.simulate.editlog.crash", false)) {
LOG.warn("Simulating edit log crash, not closing edit log cleanly as"
+ "part of shutdown");
} else {
dir.close();
}
blocksMap.close();
} catch (InterruptedException ie) {
} catch (IOException ie) {
LOG.error("Error closing FSDirectory", ie);
IOUtils.cleanup(LOG, dir);
}
}
}
/**
* Is this name system running?
*/
boolean isRunning() {
return fsRunning;
}
/**
* Dump all metadata into specified file
*/
void metaSave(String filename) throws IOException {
readLock();
try {
checkSuperuserPrivilege();
File file = new File(System.getProperty("hadoop.log.dir"),
filename);
PrintWriter out = new PrintWriter(new BufferedWriter(
new FileWriter(file, true)));
//
// Dump contents of neededReplication
//
synchronized (neededReplications) {
out.println("Metasave: Blocks waiting for replication: " +
neededReplications.size());
for (Block block : neededReplications) {
List<DatanodeDescriptor> containingNodes =
new ArrayList<DatanodeDescriptor>();
NumberReplicas numReplicas = new NumberReplicas();
// source node returned is not used
chooseSourceDatanode(block, containingNodes, numReplicas);
int usableReplicas = numReplicas.liveReplicas() +
numReplicas.decommissionedReplicas();
// l: == live:, d: == decommissioned c: == corrupt e: == excess
out.print(block + ((usableReplicas > 0) ? "" : " MISSING") +
" size: " + block.getNumBytes() +
" (replicas:" +
" l: " + numReplicas.liveReplicas() +
" d: " + numReplicas.decommissionedReplicas() +
" c: " + numReplicas.corruptReplicas() +
" e: " + numReplicas.excessReplicas() + ") ");
Collection<DatanodeDescriptor> corruptNodes =
corruptReplicas.getNodes(block);
for (Iterator<DatanodeDescriptor> jt = blocksMap.nodeIterator(block);
jt.hasNext();) {
DatanodeDescriptor node = jt.next();
String state = "";
if (corruptNodes != null && corruptNodes.contains(node)) {
state = "(corrupt)";
} else if (node.isDecommissioned() ||
node.isDecommissionInProgress()) {
state = "(decommissioned)";
}
out.print(" " + node + state + " : ");
}
out.println("");
}
}
//
// Dump blocks from pendingReplication
//
pendingReplications.metaSave(out);
//
// Dump blocks that are waiting to be deleted
//
dumpRecentInvalidateSets(out);
//
// Dump all datanodes
//
datanodeDump(out);
out.flush();
out.close();
} finally {
readUnlock();
}
}
long getDefaultBlockSize() {
return defaultBlockSize;
}
long getAccessTimePrecision() {
return accessTimePrecision;
}
private boolean isAccessTimeSupported() {
return accessTimePrecision > 0;
}
/* get replication factor of a block */
private int getReplication(Block block) {
INodeFile fileINode = blocksMap.getINode(block);
if (fileINode == null) { // block does not belong to any file
return 0;
}
assert !fileINode.isDirectory() : "Block cannot belong to a directory.";
return fileINode.getReplication();
}
/* updates a block in under replication queue */
void updateNeededReplications(Block block,
int curReplicasDelta, int expectedReplicasDelta) {
writeLock();
try {
NumberReplicas repl = countNodes(block);
int curExpectedReplicas = getReplication(block);
neededReplications.update(block,
repl.liveReplicas(),
repl.decommissionedReplicas(),
curExpectedReplicas,
curReplicasDelta, expectedReplicasDelta);
} finally {
writeUnlock();
}
}
/////////////////////////////////////////////////////////
//
// These methods are called by secondary namenodes
//
/////////////////////////////////////////////////////////
/**
* return a list of blocks & their locations on <code>datanode</code> whose
* total size is <code>size</code>
*
* @param datanode on which blocks are located
* @param size total size of blocks
*/
BlocksWithLocations getBlocks(DatanodeID datanode, long size)
throws IOException {
readLock();
try {
checkSuperuserPrivilege();
DatanodeDescriptor node = getDatanode(datanode);
if (node == null) {
NameNode.stateChangeLog.warn("BLOCK* NameSystem.getBlocks: "
+ "Asking for blocks from an unrecorded node " + datanode.getName());
throw new IllegalArgumentException(
"Unexpected exception. Got getBlocks message for datanode " +
datanode.getName() + ", but there is no info for it");
}
int numBlocks = node.numBlocks();
if (numBlocks == 0) {
return new BlocksWithLocations(new BlockWithLocations[0]);
}
Iterator<Block> iter = node.getBlockIterator();
int startBlock = r.nextInt(numBlocks); // starting from a random block
// skip blocks
for (int i = 0; i < startBlock; i++) {
iter.next();
}
List<BlockWithLocations> results = new ArrayList<BlockWithLocations>();
long totalSize = 0;
while (totalSize < size && iter.hasNext()) {
totalSize += addBlock(iter.next(), results);
}
if (totalSize < size) {
iter = node.getBlockIterator(); // start from the beginning
for (int i = 0; i < startBlock && totalSize < size; i++) {
totalSize += addBlock(iter.next(), results);
}
}
return new BlocksWithLocations(
results.toArray(new BlockWithLocations[results.size()]));
} finally {
readUnlock();
}
}
/**
* Get all valid locations of the block & add the block to results
* return the length of the added block; 0 if the block is not added
*/
private long addBlock(Block block, List<BlockWithLocations> results) {
ArrayList<String> machineSet =
new ArrayList<String>(blocksMap.numNodes(block));
for (Iterator<DatanodeDescriptor> it =
blocksMap.nodeIterator(block); it.hasNext();) {
String storageID = it.next().getStorageID();
// filter invalidate replicas
LightWeightHashSet<Block> blocks = recentInvalidateSets.get(storageID);
if (blocks == null || !blocks.contains(block)) {
machineSet.add(storageID);
}
}
if (machineSet.size() == 0) {
return 0;
} else {
results.add(new BlockWithLocations(block,
machineSet.toArray(new String[machineSet.size()])));
return block.getNumBytes();
}
}
/////////////////////////////////////////////////////////
//
// These methods are called by HadoopFS clients
//
/////////////////////////////////////////////////////////
/**
* Set permissions for an existing file.
*
* @throws IOException
*/
public void setPermission(String src, FsPermission permission
) throws IOException {
INode[] inodes = null;
writeLock();
try {
if (isInSafeMode()) {
throw new SafeModeException("Cannot set permission for " + src, safeMode);
}
inodes = dir.getExistingPathINodes(src);
checkOwner(src, inodes);
dir.setPermission(src, permission);
} finally {
writeUnlock();
}
getEditLog().logSync(false);
if (auditLog.isInfoEnabled()) {
logAuditEvent(getCurrentUGI(),
Server.getRemoteIp(),
"setPermission", src, null, getLastINode(inodes));
}
}
/**
* Set owner for an existing file.
*
* @throws IOException
*/
public void setOwner(String src, String username, String group
) throws IOException {
INode[] inodes = null;
writeLock();
try {
if (isInSafeMode()) {
throw new SafeModeException("Cannot set permission for " + src, safeMode);
}
inodes = dir.getExistingPathINodes(src);
FSPermissionChecker pc = checkOwner(src, inodes);
if (!pc.isSuper) {
if (username != null && !pc.user.equals(username)) {
throw new AccessControlException("Non-super user cannot change owner.");
}
if (group != null && !pc.containsGroup(group)) {
throw new AccessControlException("User does not belong to " + group
+ " .");
}
}
dir.setOwner(src, username, group);
} finally {
writeUnlock();
}
getEditLog().logSync(false);
if (auditLog.isInfoEnabled()) {
logAuditEvent(getCurrentUGI(),
Server.getRemoteIp(),
"setOwner", src, null, getLastINode(inodes));
}
}
enum BlockMetaInfoType {
NONE, // no meta info
VERSION, // data transfer version#
VERSION_AND_NAMESPACEID // namespaceid + data transfer version#
}
/**
* Updates DatanodeInfo for each LocatedBlock in locatedBlocks.
*/
LocatedBlocksWithMetaInfo updateDatanodeInfo(LocatedBlocks locatedBlocks)
throws IOException {
if (locatedBlocks.getLocatedBlocks().size() == 0)
return new LocatedBlocksWithMetaInfo(locatedBlocks.getFileLength(),
locatedBlocks.getLocatedBlocks(), false,
DataTransferProtocol.DATA_TRANSFER_VERSION, getNamespaceId(),
this.nameNode.getClientProtocolMethodsFingerprint());
List<LocatedBlock> newBlocks = new ArrayList<LocatedBlock>();
readLock();
try {
for (LocatedBlock locBlock: locatedBlocks.getLocatedBlocks()) {
Block block = locBlock.getBlock();
int numNodes = blocksMap.numNodes(block);
int numCorruptNodes = countNodes(block).corruptReplicas();
int numCorruptReplicas = corruptReplicas.numCorruptReplicas(block);
if (numCorruptNodes != numCorruptReplicas) {
LOG.warn("Inconsistent number of corrupt replicas for " +
block + "blockMap has " + numCorruptNodes +
" but corrupt replicas map has " + numCorruptReplicas);
}
boolean blockCorrupt = numCorruptNodes == numNodes;
int numMachineSet = blockCorrupt ? numNodes : (numNodes - numCorruptNodes);
DatanodeDescriptor[] machineSet = new DatanodeDescriptor[numMachineSet];
if (numMachineSet > 0) {
numNodes = 0;
for(Iterator<DatanodeDescriptor> it = blocksMap.nodeIterator(block);
it.hasNext();) {
DatanodeDescriptor dn = it.next();
boolean replicaCorrupt = corruptReplicas.isReplicaCorrupt(block, dn);
if (blockCorrupt || (!blockCorrupt && !replicaCorrupt))
machineSet[numNodes++] = dn;
}
}
LocatedBlock newBlock = new LocatedBlock(block, machineSet, 0, blockCorrupt);
newBlocks.add(newBlock);
}
} finally {
readUnlock();
}
return new LocatedBlocksWithMetaInfo(locatedBlocks.getFileLength(),
newBlocks, false, DataTransferProtocol.DATA_TRANSFER_VERSION,
getNamespaceId(), this.nameNode.getClientProtocolMethodsFingerprint());
}
/**
* Get block locations within the specified range.
*
* @see #getBlockLocations(String, long, long)
*/
LocatedBlocks getBlockLocations(String clientMachine, String src,
long offset, long length,
BlockMetaInfoType type) throws IOException {
INode[] inodes = dir.getExistingPathINodes(src);
if (isPermissionEnabled) {
checkPathAccess(src, inodes, FsAction.READ);
}
LocatedBlocks blocks = getBlockLocations(src, inodes[inodes.length-1],
offset, length, false, type);
if (blocks != null) {
//sort the blocks
DatanodeDescriptor client = host2DataNodeMap.getDatanodeByHost(
clientMachine);
for (LocatedBlock b : blocks.getLocatedBlocks()) {
clusterMap.pseudoSortByDistance(client, b.getLocations());
// Move decommissioned datanodes to the bottom
Arrays.sort(b.getLocations(), DFSUtil.DECOM_COMPARATOR);
}
}
return blocks;
}
/**
* Get block locations within the specified range.
*
* @see ClientProtocol#getBlockLocations(String, long, long)
*/
public LocatedBlocks getBlockLocations(String src, long offset, long length) throws IOException {
INode[] inodes = dir.getExistingPathINodes(src);
return getBlockLocations(src, inodes[inodes.length-1],
offset, length, false, BlockMetaInfoType.NONE);
}
/**
* Get block locations within the specified range.
*
* @see ClientProtocol#getBlockLocations(String, long, long)
*/
public LocatedBlocks getBlockLocations(String src, INode inode, long offset, long length,
boolean doAccessTime, BlockMetaInfoType type)
throws IOException {
if (offset < 0) {
throw new IOException("Negative offset is not supported. File: " + src);
}
if (length < 0) {
throw new IOException("Negative length is not supported. File: " + src);
}
final LocatedBlocks ret = getBlockLocationsInternal(src, inode,
offset, length, Integer.MAX_VALUE, doAccessTime, type);
if (auditLog.isInfoEnabled()) {
logAuditEvent(getCurrentUGI(),
Server.getRemoteIp(),
"open", src, null, null);
}
return ret;
}
private LocatedBlocks getBlockLocationsInternal(String src,
INode inode,
long offset,
long length,
int nrBlocksToReturn,
boolean doAccessTime,
BlockMetaInfoType type)
throws IOException {
boolean doneSetTimes = false;
for (int attempt = 0; attempt < 2; attempt++) {
if (attempt == 0) { // first attempt is with readlock
readLock();
} else { // second attempt is with write lock
writeLock(); // writelock is needed to set accesstime
// We need to refetch the node in case it was deleted
// while the lock was not held
INode[] inodes = dir.getExistingPathINodes(src);
inode = inodes[inodes.length - 1];
}
// if the namenode is in safemode, then do not update access time
if (isInSafeMode()) {
doAccessTime = false;
}
try {
long now = now();
if (inode == null || inode.isDirectory()) {
return null;
}
INodeFile fileInode = (INodeFile)inode;
if (doAccessTime && isAccessTimeSupported()) {
if (now > inode.getAccessTime() + getAccessTimePrecision()) {
// if we have to set access time but we only have the readlock, then
// restart this entire operation with the writeLock.
if (attempt == 0) {
continue;
}
dir.setTimes(src, fileInode, -1, now, false);
doneSetTimes = true; // successful setTime call
}
}
return getBlockLocationsInternal(fileInode, offset, length,
nrBlocksToReturn, type);
} finally {
if (attempt == 0) {
readUnlock();
} else {
writeUnlock();
}
if (doneSetTimes) {
getEditLog().logSyncIfNeeded(); // sync if too many transactions in buffer
}
}
}
return null; // can never reach here
}
LocatedBlocks getBlockLocationsInternal(INodeFile inode,
long offset, long length,
int nrBlocksToReturn) throws IOException {
return getBlockLocationsInternal(inode, offset, length,
nrBlocksToReturn, BlockMetaInfoType.NONE);
}
LocatedBlocks getBlockLocationsInternal(INodeFile inode,
long offset, long length,
int nrBlocksToReturn,
BlockMetaInfoType type)
throws IOException {
readLock();
try {
Block[] blocks = inode.getBlocks();
if (blocks == null) {
return null;
}
if (blocks.length == 0) {
return inode.createLocatedBlocks(
new ArrayList<LocatedBlock>(blocks.length),
type, this.getFSImage().namespaceID,
this.nameNode.getClientProtocolMethodsFingerprint());
}
List<LocatedBlock> results;
results = new ArrayList<LocatedBlock>(blocks.length);
int curBlk = 0;
long curPos = 0, blkSize = 0;
int nrBlocks = (blocks[0].getNumBytes() == 0) ? 0 : blocks.length;
for (curBlk = 0; curBlk < nrBlocks; curBlk++) {
blkSize = blocks[curBlk].getNumBytes();
assert blkSize > 0 : "Block of size 0";
if (curPos + blkSize > offset) {
break;
}
curPos += blkSize;
}
if (nrBlocks > 0 && curBlk == nrBlocks) // offset >= end of file
{
return null;
}
long endOff = offset + length;
do {
// get block locations
int numNodes = blocksMap.numNodes(blocks[curBlk]);
int numCorruptNodes = countNodes(blocks[curBlk]).corruptReplicas();
int numCorruptReplicas = corruptReplicas.numCorruptReplicas(blocks[curBlk]);
if (numCorruptNodes != numCorruptReplicas) {
LOG.warn("Inconsistent number of corrupt replicas for " +
blocks[curBlk] + "blockMap has " + numCorruptNodes +
" but corrupt replicas map has " + numCorruptReplicas);
}
DatanodeDescriptor[] machineSet = null;
boolean blockCorrupt = false;
if (inode.isUnderConstruction() && curBlk == blocks.length - 1
&& blocksMap.numNodes(blocks[curBlk]) == 0) {
// get unfinished block locations
INodeFileUnderConstruction cons = (INodeFileUnderConstruction)inode;
machineSet = cons.getTargets();
blockCorrupt = false;
} else {
blockCorrupt = (numCorruptNodes == numNodes);
int numMachineSet = blockCorrupt ? numNodes :
(numNodes - numCorruptNodes);
machineSet = new DatanodeDescriptor[numMachineSet];
if (numMachineSet > 0) {
numNodes = 0;
for(Iterator<DatanodeDescriptor> it =
blocksMap.nodeIterator(blocks[curBlk]); it.hasNext();) {
DatanodeDescriptor dn = it.next();
boolean replicaCorrupt = corruptReplicas.isReplicaCorrupt(blocks[curBlk], dn);
if (blockCorrupt || (!blockCorrupt && !replicaCorrupt))
machineSet[numNodes++] = dn;
}
}
}
results.add(new LocatedBlock(blocks[curBlk], machineSet, curPos,
blockCorrupt));
curPos += blocks[curBlk].getNumBytes();
curBlk++;
} while (curPos < endOff
&& curBlk < blocks.length
&& results.size() < nrBlocksToReturn);
return inode.createLocatedBlocks(results, type,
this.getFSImage().namespaceID, this.nameNode
.getClientProtocolMethodsFingerprint());
} finally {
readUnlock();
}
}
/**
* Moves all the blocks from srcs and appends them to trg
* To avoid rollbacks we will verify validitity of ALL of the args
* before we start actual move.
* @param target
* @param srcs
* @param restricted - true if equal block sizes are to be enforced,
* false otherwise
* @throws IOException
*/
public void concat(String target, String [] srcs, boolean restricted)
throws IOException {
if(FSNamesystem.LOG.isDebugEnabled()) {
FSNamesystem.LOG.debug("concat " + Arrays.toString(srcs) +
" to " + target);
}
// check safe mode
if (isInSafeMode()) {
throw new SafeModeException("concat: cannot concat " + target, safeMode);
}
// verify args
if(target.isEmpty()) {
throw new IllegalArgumentException("concat: trg file name is empty");
}
if(srcs == null || srcs.length == 0) {
throw new IllegalArgumentException("concat: srcs list is empty or null");
}
// currently we require all the files to be in the same dir
String trgParent =
target.substring(0, target.lastIndexOf(Path.SEPARATOR_CHAR));
for(String s : srcs) {
String srcParent = s.substring(0, s.lastIndexOf(Path.SEPARATOR_CHAR));
if(! srcParent.equals(trgParent)) {
throw new IllegalArgumentException
("concat: srcs and target shoould be in same dir");
}
}
INode[] targetInodes = null;
writeLock();
try {
// write permission for the target
if (isPermissionEnabled) {
targetInodes = dir.getExistingPathINodes(target);
checkPathAccess(target, targetInodes, FsAction.WRITE);
// and srcs
for(String aSrc: srcs) {
INode[] srcNodes = dir.getExistingPathINodes(aSrc);
checkPathAccess(aSrc, srcNodes, FsAction.READ); // read the file
checkParentAccess(aSrc, srcNodes, FsAction.WRITE); // for delete
}
}
// to make sure no two files are the same
Set<INode> si = new HashSet<INode>();
// we put the following prerequisite for the operation
// replication and blocks sizes should be the same for ALL the blocks
// check the target
INode inode = dir.getInode(target);
if(inode == null) {
throw new IllegalArgumentException("concat: trg file doesn't exist");
}
if(inode.isUnderConstruction()) {
throw new IllegalArgumentException("concat: trg file is uner construction");
}
INodeFile trgInode = (INodeFile) inode;
// per design trg shouldn't be empty and all the blocks same size
if(trgInode.blocks.length == 0) {
throw new IllegalArgumentException("concat: "+ target + " file is empty");
}
long blockSize = trgInode.getPreferredBlockSize();
// check the end block to be full
if(restricted && blockSize != trgInode.blocks[trgInode.blocks.length-1].getNumBytes()) {
throw new IllegalArgumentException(target
+ " file: last block should be full. " + " PreferredBlockSize is "
+ blockSize + " block size is: "
+ trgInode.blocks[trgInode.blocks.length - 1].getNumBytes());
}
si.add(trgInode);
short repl = trgInode.getReplication();
// now check the srcs
boolean endSrc = false; // final src file doesn't have to have full end block
for(int i=0; i<srcs.length; i++) {
String src = srcs[i];
if(i==srcs.length-1)
endSrc=true;
INodeFile srcInode = dir.getFileINode(src);
if(src.isEmpty()
|| srcInode == null
|| srcInode.isUnderConstruction()
|| srcInode.blocks.length == 0) {
throw new IllegalArgumentException("concat: file " + src +
" is invalid or empty or underConstruction");
}
// check replication and blocks size
if(repl != srcInode.getReplication()) {
throw new IllegalArgumentException(src + " and " + target + " " +
"should have same replication: "
+ repl + " vs. " + srcInode.getReplication());
}
// verify that all the blocks are of the same length as target
// should be enough to check the end blocks
if (restricted) {
int idx = srcInode.blocks.length-1;
if(endSrc)
idx = srcInode.blocks.length-2; // end block of endSrc is OK not to be full
if(idx >= 0 && srcInode.blocks[idx].getNumBytes() != blockSize) {
throw new IllegalArgumentException("concat: blocks sizes of " +
src + " and " + target + " should all be the same");
}
}
si.add(srcInode);
}
// make sure no two files are the same
if(si.size() < srcs.length+1) { // trg + srcs
// it means at least two files are the same
throw new IllegalArgumentException("at least two files are the same");
}
if(NameNode.stateChangeLog.isDebugEnabled()) {
NameNode.stateChangeLog.debug("DIR* NameSystem.concat: " +
Arrays.toString(srcs) + " to " + target);
}
dir.concatInternal(target,srcs);
} finally {
writeUnlock();
}
getEditLog().logSync();
if (auditLog.isInfoEnabled()) {
logAuditEvent(getCurrentUGI(),
Server.getRemoteIp(),
"concat", Arrays.toString(srcs), target,
getLastINode(targetInodes));
}
}
/**
* stores the modification and access time for this inode.
* The access time is precise upto an hour. The transaction, if needed, is
* written to the edits log but is not flushed.
*/
public void setTimes(String src, long mtime, long atime) throws IOException {
setTimesInternal(src, mtime, atime);
getEditLog().logSync(false);
}
private void setTimesInternal(String src, long mtime, long atime)
throws IOException {
writeLock();
try {
if (isInSafeMode()) {
throw new SafeModeException("Cannot set accesstimes for " + src, safeMode);
}
//
// The caller needs to have write access to set access & modification times.
if (isPermissionEnabled) {
INode[] inodes = dir.getExistingPathINodes(src);
checkPathAccess(src, inodes, FsAction.WRITE);
}
INodeFile inode = dir.getFileINode(src);
if (inode != null) {
dir.setTimes(src, inode, mtime, atime, true);
if (auditLog.isInfoEnabled()) {
logAuditEvent(getCurrentUGI(),
Server.getRemoteIp(),
"setTimes", src, null, inode);
}
} else {
throw new FileNotFoundException("File " + src + " does not exist.");
}
} finally {
writeUnlock();
}
}
/**
* Set replication for an existing file.
* <p/>
* The NameNode sets new replication and schedules either replication of
* under-replicated data blocks or removal of the eccessive block copies
* if the blocks are over-replicated.
*
* @param src file name
* @param replication new replication
* @return true if successful;
* false if file does not exist or is a directory
* @see ClientProtocol#setReplication(String, short)
*/
public boolean setReplication(String src, short replication)
throws IOException {
boolean status = setReplicationInternal(src, replication);
getEditLog().logSync(false);
if (status && auditLog.isInfoEnabled()) {
logAuditEvent(getCurrentUGI(),
Server.getRemoteIp(),
"setReplication", src, null, null);
}
return status;
}
private boolean setReplicationInternal(String src,
short replication
) throws IOException {
writeLock();
try {
if (isInSafeMode()) {
throw new SafeModeException("Cannot set replication for " + src, safeMode);
}
verifyReplication(src, replication, null);
if (isPermissionEnabled) {
INode[] inodes = dir.getExistingPathINodes(src);
checkPathAccess(src, inodes, FsAction.WRITE);
}
int[] oldReplication = new int[1];
Block[] fileBlocks;
fileBlocks = dir.setReplication(src, replication, oldReplication);
if (fileBlocks == null) // file not found or is a directory
{
return false;
}
int oldRepl = oldReplication[0];
if (oldRepl == replication) // the same replication
{
return true;
}
// update needReplication priority queues
for (int idx = 0; idx < fileBlocks.length; idx++) {
updateNeededReplications(fileBlocks[idx], 0, replication - oldRepl);
}
if (oldRepl > replication) {
// old replication > the new one; need to remove copies
LOG.info("Reducing replication for file " + src
+ ". New replication is " + replication);
for (int idx = 0; idx < fileBlocks.length; idx++) {
overReplicatedBlocks.add(fileBlocks[idx]);
}
} else { // replication factor is increased
LOG.info("Increasing replication for file " + src
+ ". New replication is " + replication);
}
return true;
} finally {
writeUnlock();
}
}
long getPreferredBlockSize(String filename) throws IOException {
if (isPermissionEnabled) {
INode[] inodes = dir.getExistingPathINodes(filename);
checkTraverse(filename, inodes);
}
return dir.getPreferredBlockSize(filename);
}
/**
* Check whether the replication parameter is within the range
* determined by system configuration.
*/
private void verifyReplication(String src,
short replication,
String clientName
) throws IOException {
String text = "file " + src
+ ((clientName != null) ? " on client " + clientName : "")
+ ".\n"
+ "Requested replication " + replication;
if (replication > maxReplication) {
throw new IOException(text + " exceeds maximum " + maxReplication);
}
if (replication < minReplication) {
throw new IOException(
text + " is less than the required minimum " + minReplication);
}
}
/*
* Verify that parent dir exists
*/
private void verifyParentDir(String src) throws FileAlreadyExistsException,
FileNotFoundException {
Path parent = new Path(src).getParent();
if (parent != null) {
INode[] pathINodes = dir.getExistingPathINodes(parent.toString());
if (pathINodes[pathINodes.length - 1] == null) {
throw new FileNotFoundException("Parent directory doesn't exist: "
+ parent.toString());
} else if (!pathINodes[pathINodes.length - 1].isDirectory()) {
throw new FileAlreadyExistsException("Parent path is not a directory: "
+ parent.toString());
}
}
}
/**
* Create a new file entry in the namespace.
*
* @throws IOException if file name is invalid
* {@link FSDirectory#isValidToCreate(String)}.
* @see ClientProtocol#create(String, FsPermission, String, boolean, short, long)
*/
void startFile(String src, PermissionStatus permissions,
String holder, String clientMachine,
boolean overwrite, boolean createParent, short replication, long blockSize
) throws IOException {
INodeFileUnderConstruction file =
startFileInternal(src, permissions, holder, clientMachine, overwrite, false,
createParent, replication, blockSize);
getEditLog().logSync(false);
if (auditLog.isInfoEnabled()) {
logAuditEvent(getCurrentUGI(),
Server.getRemoteIp(),
"create", src, null, file);
}
}
private INodeFileUnderConstruction startFileInternal(String src,
PermissionStatus permissions,
String holder,
String clientMachine,
boolean overwrite,
boolean append,
boolean createParent,
short replication,
long blockSize
) throws IOException {
// tokenize the filename into components
String[] names = INodeDirectory.getPathNames(src);
if (!pathValidator.isValidName(src, names)) {
numInvalidFilePathOperations++;
throw new IOException("Invalid file name: " + src);
}
// convert names to array of bytes w/o holding lock
byte[][] components = INodeDirectory.getPathComponents(names);
if (NameNode.stateChangeLog.isDebugEnabled()) {
NameNode.stateChangeLog.debug("DIR* NameSystem.startFile: src=" + src
+ ", holder=" + holder
+ ", clientMachine=" + clientMachine
+ ", createParent=" + createParent
+ ", replication=" + replication
+ ", overwrite=" + overwrite
+ ", append=" + append);
}
writeLock();
try {
if (isInSafeMode()) {
throw new SafeModeException("Cannot create file" + src, safeMode);
}
INode[] inodes = new INode[components.length];
dir.rootDir.getExistingPathINodes(components, inodes);
INode inode = inodes[inodes.length-1];
boolean pathExists = inode != null &&
(inode.isDirectory() || ((INodeFile)inode).getBlocks() != null);
if (pathExists && inode.isDirectory()) {
throw new IOException("Cannot create file " + src + "; already exists as a directory.");
}
if (isPermissionEnabled) {
if (append || (overwrite && pathExists)) {
checkPathAccess(src, inodes, FsAction.WRITE);
} else {
checkAncestorAccess(src, inodes, FsAction.WRITE);
}
}
if (!createParent) {
verifyParentDir(src);
}
try {
INode myFile = (INodeFile) inode;
recoverLeaseInternal(myFile, src, holder, clientMachine, false, false);
try {
verifyReplication(src, replication, clientMachine);
} catch (IOException e) {
throw new IOException("failed to create " + e.getMessage());
}
if (append) {
if (myFile == null) {
throw new FileNotFoundException("failed to append to non-existent file "
+ src + " on client " + clientMachine);
} else if (myFile.isDirectory()) {
throw new IOException("failed to append to directory " + src
+ " on client " + clientMachine);
}
} else if (myFile != null) {
if (overwrite) {
deleteInternal(src, inodes, false, true);
} else {
throw new IOException("failed to create file " + src
+ " on client " + clientMachine
+ " either because the filename is invalid or the file exists");
}
}
DatanodeDescriptor clientNode =
host2DataNodeMap.getDatanodeByHost(clientMachine);
if (append) {
//
// Replace current node with a INodeUnderConstruction.
// Recreate in-memory lease record.
//
INodeFile node = (INodeFile) myFile;
// cannot append the hard linked file if its reference cnt is more than 1
if (node instanceof INodeHardLinkFile) {
throw new IOException("failed to append file " + src
+ " on client " + clientMachine
+ " because the file is hard linked !");
}
INodeFileUnderConstruction cons = new INodeFileUnderConstruction(
node.getLocalNameBytes(),
node.getReplication(),
node.getModificationTime(),
node.getPreferredBlockSize(),
node.getBlocks(),
node.getPermissionStatus(),
holder,
clientMachine,
clientNode);
dir.replaceNode(src, inodes, node, cons, true);
leaseManager.addLease(cons.clientName, src,
cons.getModificationTime());
return cons;
} else {
// Now we can add the name to the filesystem. This file has no
// blocks associated with it.
//
checkFsObjectLimit();
// increment global generation stamp
long genstamp = nextGenerationStamp();
INodeFileUnderConstruction newNode = dir.addFile(
src, names, components, inodes, permissions,
replication, blockSize, holder, clientMachine, clientNode, genstamp);
if (newNode == null) {
throw new IOException("DIR* NameSystem.startFile: " +
"Unable to add file to namespace.");
}
leaseManager.addLease(newNode.clientName, src,
newNode.getModificationTime());
if (NameNode.stateChangeLog.isDebugEnabled()) {
NameNode.stateChangeLog.debug("DIR* NameSystem.startFile: "
+ "add " + src + " to namespace for " + holder);
}
return newNode;
}
} catch (IOException ie) {
NameNode.stateChangeLog.warn("DIR* NameSystem.startFile: "
+ ie.getMessage());
throw ie;
}
} finally {
writeUnlock();
}
}
/**
* Recover lease;
* Immediately revoke the lease of the current lease holder and start lease
* recovery so that the file can be forced to be closed.
*
* @param src the path of the file to start lease recovery
* @param holder the lease holder's name
* @param clientMachine the client machine's name
* @param discardLastBlock if true, then drop last block if hsync not
* yet invoked on last block
* @return if the lease recovery completes or not
* @throws IOException
*/
boolean recoverLease(String src, String holder, String clientMachine,
boolean discardLastBlock) throws IOException {
// convert names to array of bytes w/o holding lock
byte[][] components = INodeDirectory.getPathComponents(src);
writeLock();
try {
if (isInSafeMode()) {
throw new SafeModeException(
"Cannot recover the lease of " + src, safeMode);
}
INode inode = dir.getFileINode(components);
if (inode == null) {
throw new FileNotFoundException("File not found " + src);
}
if (!inode.isUnderConstruction()) {
return true;
}
if (isPermissionEnabled) {
INode[] inodes = dir.getExistingPathINodes(src);
checkPathAccess(src, inodes, FsAction.WRITE);
}
return recoverLeaseInternal(inode, src, holder, clientMachine,
true, discardLastBlock);
} finally {
writeUnlock();
}
}
private boolean recoverLeaseInternal(INode fileInode,
String src, String holder, String clientMachine, boolean force,
boolean discardLastBlock)
throws IOException {
if (fileInode != null && fileInode.isUnderConstruction()) {
INodeFileUnderConstruction pendingFile = (INodeFileUnderConstruction) fileInode;
//
// If the file is under construction , then it must be in our
// leases. Find the appropriate lease record.
//
Lease lease = leaseManager.getLease(holder);
//
// We found the lease for this file. And surprisingly the original
// holder is trying to recreate this file. This should never occur.
//
if (!force && lease != null) {
Lease leaseFile = leaseManager.getLeaseByPath(src);
if (leaseFile != null && leaseFile.equals(lease)) {
throw new AlreadyBeingCreatedException(
"failed to create file " + src + " for " + holder +
" on client " + clientMachine +
" because current leaseholder is trying to recreate file.");
}
}
//
// Find the original holder.
//
lease = leaseManager.getLease(pendingFile.clientName);
if (lease == null) {
throw new AlreadyBeingCreatedException(
"failed to create file " + src + " for " + holder +
" on client " + clientMachine +
" because pendingCreates is non-null but no leases found.");
}
if (force) {
// close now: no need to wait for soft lease expiration and
// close only the file src
LOG.info("recoverLease: recover lease " + lease + ", src=" + src +
" from client " + pendingFile.clientName +
" discardLastBloc = " + discardLastBlock);
// We have to tell the client that the lease recovery has succeeded e.g. in case the file
// has no blocks. Otherwise, the client will get stuck in an infinite loop.
return internalReleaseLeaseOne(lease, src, pendingFile, discardLastBlock);
} else {
//
// If the original holder has not renewed in the last SOFTLIMIT
// period, then start lease recovery.
//
if (lease.expiredSoftLimit()) {
LOG.info("startFile: recover lease " + lease + ", src=" + src +
" from client " + pendingFile.clientName);
internalReleaseLease(lease, src, pendingFile);
}
throw new AlreadyBeingCreatedException(
"failed to create file " + src + " for " + holder +
" on client " + clientMachine +
", because this file is already being created by " +
pendingFile.getClientName() +
" on " + pendingFile.getClientMachine());
}
}
// This does not necessarily mean lease recovery has failed, but we will
// have the client retry.
return false;
}
/**
* Append to an existing file in the namespace.
*/
public LocatedBlock appendFile(String src, String holder, String clientMachine
) throws IOException {
return appendFile(src, holder, clientMachine, BlockMetaInfoType.NONE);
}
/**
* Append to an existing file in the namespace.
*/
public LocatedBlock appendFile(String src, String holder, String clientMachine,
BlockMetaInfoType type) throws IOException {
if (supportAppends == false) {
throw new IOException("Append to hdfs not supported." +
" Please refer to dfs.support.append configuration parameter.");
}
startFileInternal(src, null, holder, clientMachine, false, true,
false, (short) maxReplication, (long) 0);
getEditLog().logSync();
//
// Create a LocatedBlock object for the last block of the file
// to be returned to the client. Return null if the file does not
// have a partial block at the end.
//
LocatedBlock lb = null;
writeLock();
try {
// Need to re-check existence here, since the file may have been deleted
// in between the synchronized blocks
INodeFileUnderConstruction file = checkLease(src, holder);
Block[] blocks = file.getBlocks();
if (blocks != null && blocks.length > 0) {
Block last = blocks[blocks.length - 1];
BlockInfo storedBlock = blocksMap.getStoredBlock(last);
if (file.getPreferredBlockSize() > storedBlock.getNumBytes()) {
long fileLength = file.computeContentSummary().getLength();
DatanodeDescriptor[] targets = new DatanodeDescriptor[blocksMap.numNodes(last)];
Iterator<DatanodeDescriptor> it = blocksMap.nodeIterator(last);
for (int i = 0; it != null && it.hasNext(); i++) {
targets[i] = it.next();
}
// remove the replica locations of this block from the blocksMap
for (int i = 0; i < targets.length; i++) {
targets[i].removeBlock(storedBlock);
}
// set the locations of the last block in the lease record
file.setLastBlock(storedBlock, targets);
lb = createLocatedBlock(last, targets, fileLength - storedBlock.getNumBytes(),
DataTransferProtocol.DATA_TRANSFER_VERSION, type);
// Remove block from replication queue.
neededReplications.remove(last, -1);
// remove this block from the list of pending blocks to be deleted.
// This reduces the possibility of triggering HADOOP-1349.
//
for (DatanodeDescriptor dd : targets) {
String datanodeId = dd.getStorageID();
LightWeightHashSet<Block> v = recentInvalidateSets.get(datanodeId);
if (v != null && v.remove(last)) {
if (v.isEmpty()) {
recentInvalidateSets.remove(datanodeId);
}
pendingDeletionBlocksCount--;
}
}
}
}
} finally {
writeUnlock();
}
if (lb != null) {
if (NameNode.stateChangeLog.isDebugEnabled()) {
NameNode.stateChangeLog.debug("DIR* NameSystem.appendFile: file "
+ src + " for " + holder + " at " + clientMachine
+ " block " + lb.getBlock()
+ " block size " + lb.getBlock().getNumBytes());
}
}
if (auditLog.isInfoEnabled()) {
logAuditEvent(getCurrentUGI(),
Server.getRemoteIp(),
"append", src, null, null);
}
return lb;
}
/**
* Stub for old callers pre-HDFS-630
*/
public LocatedBlock getAdditionalBlock(String src,
String clientName
) throws IOException {
return getAdditionalBlock(src, clientName, null);
}
/**
* Given information about a datanode, returns the DatanodeDescriptor for the
* same, or if it doesn't find the datanode, it looks for a machine local and
* then rack local datanode, if a rack local datanode is not possible either,
* it returns the DatanodeDescriptor of any random node in the cluster.
*
* @param info
* the datanode to look for
* @return the best match for the given datanode
* @throws IOException
*/
private DatanodeDescriptor findBestDatanodeInCluster(DatanodeInfo info)
throws IOException {
DatanodeDescriptor node = getDatanode(info);
if (node == null) {
node = host2DataNodeMap.getDatanodeByName(info.getName());
}
if (node == null) {
node = host2DataNodeMap.getDatanodeByHost(info.getHostName());
}
if (node == null) {
if (info.getNetworkLocation() == null
|| info.getNetworkLocation().equals(NetworkTopology.DEFAULT_RACK)) {
resolveNetworkLocation(info);
}
// If the current cluster doesn't contain the node, fallback to
// something machine local and then rack local.
List<Node> rackNodes = clusterMap.getDatanodesInRack(info
.getNetworkLocation());
if (rackNodes != null) {
// Try something machine local.
for (Node rackNode : rackNodes) {
if (((DatanodeDescriptor) rackNode).getHost().equals(info.getHost())) {
node = (DatanodeDescriptor) rackNode;
break;
}
}
// Try something rack local.
if (node == null && !rackNodes.isEmpty()) {
node = (DatanodeDescriptor) (rackNodes
.get(r.nextInt(rackNodes.size())));
}
}
// If we can't even choose rack local, just choose any node in the
// cluster.
if (node == null) {
node = (DatanodeDescriptor) clusterMap.chooseRandom(NodeBase.ROOT);
}
}
if (node == null) {
throw new IOException("Could not find any node in the cluster for : "
+ info);
}
return node;
}
public DatanodeDescriptor[] computeTargets(String src, int replication,
DatanodeDescriptor clientNode, List<Node> excludedNodes, long blockSize,
List<DatanodeInfo> favoredNodes) throws IOException {
DatanodeDescriptor targets[];
// If excluded nodes null, then instantiate for future use in this method.
if (excludedNodes == null) {
excludedNodes = new ArrayList<Node>();
}
if (favoredNodes == null) {
// Favored nodes not specified, fall back to regular block placement.
targets = replicator.chooseTarget(src, replication, clientNode,
new ArrayList<DatanodeDescriptor>(), excludedNodes, blockSize);
} else {
// If favored nodes are specified choose a target for each.
List<DatanodeDescriptor> results = new ArrayList<DatanodeDescriptor>();
for (int i = 0; i < Math.min(favoredNodes.size(), replication); i++) {
DatanodeDescriptor favoredNode = findBestDatanodeInCluster(favoredNodes
.get(i));
// Choose a single node which is local to favoredNode.
DatanodeDescriptor[] locations = replicator.chooseTarget(src, 1,
favoredNode, new ArrayList<DatanodeDescriptor>(),
excludedNodes, blockSize);
if (locations.length != 1) {
LOG.warn("Could not find a target for file " + src
+ " with favored node " + favoredNode);
continue;
}
DatanodeDescriptor target = locations[0];
results.add(target);
excludedNodes.add(target);
}
// Not enough nodes computed, place the remaining replicas.
if (results.size() < replication) {
// Not enough favored nodes, use replicator to choose other nodes.
replication -= results.size();
DatanodeDescriptor[] remainingTargets = replicator.chooseTarget(src,
replication, clientNode,
results, excludedNodes, blockSize);
for (int i = 0; i < remainingTargets.length; i++) {
results.add(remainingTargets[i]);
}
}
targets = new DatanodeDescriptor[results.size()];
results.toArray(targets);
clusterMap.getPipeline(clientNode, targets);
}
return targets;
}
/**
* The client would like to obtain an additional block for the indicated
* filename (which is being written-to). Return an array that consists
* of the block, plus a set of machines. The first on this list should
* be where the client writes data. Subsequent items in the list must
* be provided in the connection to the first datanode.
* <p/>
* Make sure the previous blocks have been reported by datanodes and
* are replicated. Will return an empty 2-elt array if we want the
* client to "try again later".
*/
public LocatedBlock getAdditionalBlock(String src,
String clientName,
List<Node> excludedNodes)
throws IOException {
return getAdditionalBlock(src, clientName, excludedNodes, null,
-1, null, BlockMetaInfoType.NONE);
}
public LocatedBlock getAdditionalBlock(String src,
String clientName,
List<Node> excludedNodes,
List<DatanodeInfo> favoredNodes,
long startPos,
Block lastBlock,
BlockMetaInfoType type)
throws IOException {
long fileLength = -1, blockSize = -1;
int replication = 0;
DatanodeDescriptor clientNode = null;
Block newBlock = null;
DatanodeDescriptor[] targets = null;
// convert path string into an array of bytes w/o holding lock
byte[][] components = INodeDirectory.getPathComponents(src);
INode[] pathINodes = new INode[components.length];
if (NameNode.stateChangeLog.isDebugEnabled()) {
NameNode.stateChangeLog.debug("BLOCK* NameSystem.getAdditionalBlock: file "
+ src + " for " + clientName);
}
boolean returnLastBlock = false;
INodeFileUnderConstruction pendingFile;
readLock();
try {
// have we exceeded the configured limit of fs objects.
checkFsObjectLimit();
dir.rootDir.getExistingPathINodes(components, pathINodes);
pendingFile =
checkLease(src, clientName, pathINodes[pathINodes.length - 1]);
fileLength = pendingFile.computeContentSummary().getLength();
int numExistingBlocks = pendingFile.getBlocks().length;
if (startPos != numExistingBlocks * pendingFile.getPreferredBlockSize()
&& startPos != -1) {
// If the file size from client size matches the the size
// before the last block, there is a possible that it is a
// duplicated RPC from client, when the previous operation
// succeeded but the client failed to receive the suceess
// ack. If the last block is empty from namenode's knowlege
// and last block the client knows is the second last one,
// name-node will just return the last block.
//
if (lastBlock != null
&& startPos == (numExistingBlocks - 1)
* pendingFile.getPreferredBlockSize()
&& pendingFile.getLastBlock().getNumBytes() == 0
&& numExistingBlocks > 1
&& pendingFile.getBlocks()[numExistingBlocks - 2]
.equals(lastBlock)) {
returnLastBlock = true;
newBlock = pendingFile.getLastBlock();
targets = pendingFile.getTargets();
if (getPersistBlocks()) {
dir.persistBlocks(src, pendingFile);
}
} else {
throw new IOException(
"File size from client side doesn't match name-node. Pos: "
+ startPos + " #block: " + numExistingBlocks
+ " block size: " + pendingFile.getPreferredBlockSize());
}
} else {
if (!checkFileProgress(pendingFile, false)) {
throw new NotReplicatedYetException("Not replicated yet:" + src);
}
blockSize = pendingFile.getPreferredBlockSize();
clientNode = pendingFile.getClientNode();
replication = (int) pendingFile.getReplication();
}
} finally {
readUnlock();
}
if (returnLastBlock) {
if (getPersistBlocks()) {
if (syncAddBlock) {
getEditLog().logSync(); // sync every block.
} else {
getEditLog().logSyncIfNeeded(); // sync if too many transactions in buffer
}
}
return createLocatedBlock(newBlock,
targets, fileLength,
DataTransferProtocol.DATA_TRANSFER_VERSION, type);
}
targets = computeTargets(src, replication, clientNode,
excludedNodes, blockSize, favoredNodes);
if (targets.length < this.minReplication) {
throw new IOException("File " + src + " could only be replicated to " +
targets.length + " nodes, instead of " +
minReplication);
}
// Allocate a new block and record it in the INode.
writeLock();
try {
if (isInSafeMode()) {
throw new SafeModeException("Cannot add block to " + src, safeMode);
}
Arrays.fill((Object[])pathINodes, null);
dir.rootDir.getExistingPathINodes(components, pathINodes);
pendingFile =
checkLease(src, clientName, pathINodes[pathINodes.length - 1]);
if (!checkFileProgress(pendingFile, false)) {
throw new NotReplicatedYetException("Not replicated yet:" + src);
}
// set current last (soon to be second to last) block's
// size to be the file's default block size
setLastBlockSize(pendingFile);
// replicate current last (soon to be second to last) block
// if under-replicated
replicateLastBlock(src, pendingFile);
// allocate new block record block locations in INode.
newBlock = allocateBlock(src, pathINodes);
pendingFile.setTargets(targets);
for (DatanodeDescriptor dn : targets) {
dn.incBlocksScheduled();
}
if (getPersistBlocks()) {
dir.persistBlocks(src, pendingFile);
}
} finally {
writeUnlock();
}
if (getPersistBlocks()) {
if (syncAddBlock) {
getEditLog().logSync(); // sync every block.
} else {
getEditLog().logSyncIfNeeded(); // sync if too many transactions in buffer
}
}
// log the newly created block
StringBuilder msg = new StringBuilder();
msg.append("BLOCK* NameSystem.allocateBlock: " + src + ". "
+ newBlock + " allocated to " + targets.length + " datanodes:");
for (DatanodeDescriptor dn : targets) {
msg.append(" " + dn);
}
NameNode.stateChangeLog.info(msg.toString());
// Create next block
return createLocatedBlock(newBlock, targets, fileLength,
DataTransferProtocol.DATA_TRANSFER_VERSION, type);
}
private LocatedBlock createLocatedBlock(Block block,
DatanodeDescriptor[] targets,
long fileLen, int transferProtocolVersion, BlockMetaInfoType type) {
switch (type) {
case VERSION_AND_NAMESPACEID:
return new LocatedBlockWithMetaInfo(block, targets, fileLen,
transferProtocolVersion, this.getFSImage().namespaceID, this.nameNode
.getClientProtocolMethodsFingerprint());
case VERSION:
return new VersionedLocatedBlock(block, targets, fileLen,
transferProtocolVersion);
default:
return new LocatedBlock(block, targets, fileLen);
}
}
/**
* Set last block's block size to be the file's default block size
* @param file file inode under construction
*/
private void setLastBlockSize(INodeFileUnderConstruction pendingFile) {
Block block = pendingFile.getLastBlock();
if (block != null) {
block.setNumBytes(pendingFile.getPreferredBlockSize());
}
}
/**
* Check last block of the file under construction
* Replicate it if it is under replicated
* @param src the file name
* @param file the file's inode
*/
private void replicateLastBlock(String src, INodeFileUnderConstruction file) {
if (file.blocks == null || file.blocks.length == 0)
return;
BlockInfo block = file.blocks[file.blocks.length-1];
DatanodeDescriptor[] targets = file.getTargets();
final int numOfTargets = targets == null ? 0 : targets.length;
NumberReplicas status = countNodes(block);
int totalReplicas = status.getTotal();
if (numOfTargets > totalReplicas) {
pendingReplications.add(block, numOfTargets-totalReplicas);
}
int expectedReplicas = file.getReplication();
if (numOfTargets < expectedReplicas ||
status.decommissionedReplicas != 0 ||
status.corruptReplicas != 0) {
LOG.info("Add " + block + " of " + src + " to needReplication queue: " +
" numOfTargets = " + numOfTargets +
" decomissionedReplicas = " + status.decommissionedReplicas +
" corruptReplicas = " + status.corruptReplicas);
neededReplications.add(block, status.liveReplicas,
status.decommissionedReplicas, expectedReplicas);
}
// update metrics
if (numOfTargets < expectedReplicas) {
if (numOfTargets == 1) {
myFSMetrics.numNewBlocksWithOneReplica.inc();
}
} else {
myFSMetrics.numNewBlocksWithoutFailure.inc();
}
myFSMetrics.numNewBlocks.inc();
}
/**
* The client would like to let go of the given block
*/
public boolean abandonBlock(Block b, String src, String holder
) throws IOException {
writeLock();
try {
//
// Remove the block from the pending creates list
//
if (NameNode.stateChangeLog.isDebugEnabled()) {
NameNode.stateChangeLog.debug("BLOCK* NameSystem.abandonBlock: "
+ b + "of file " + src);
}
if (isInSafeMode()) {
throw new SafeModeException("Cannot abandon block " + b +
" for fle" + src, safeMode);
}
INodeFileUnderConstruction file = checkLease(src, holder);
dir.removeBlock(src, file, b);
if (NameNode.stateChangeLog.isDebugEnabled()) {
NameNode.stateChangeLog.debug("BLOCK* NameSystem.abandonBlock: "
+ b
+ " is removed from pendingCreates");
}
return true;
} finally {
writeUnlock();
}
}
/**
* * The client would like to let go of a given file
* */
public boolean abandonFile(String src, String holder
) throws IOException {
writeLock();
try {
if (NameNode.stateChangeLog.isDebugEnabled()) {
NameNode.stateChangeLog.debug("FILE* NameSystem.abandonFile: " + src);
}
if (isInSafeMode()) {
throw new SafeModeException("Cannot abandon file " + src, safeMode);
}
checkLease(src, holder);
internalReleaseLeaseOne(leaseManager.getLease(holder), src);
if (NameNode.stateChangeLog.isDebugEnabled()) {
NameNode.stateChangeLog.debug("FILE* NameSystem.abandonFile: "
+ " has been scheduled for lease recovery");
}
return true;
} finally {
writeUnlock();
}
}
// make sure that we still have the lease on this file.
private INodeFileUnderConstruction checkLease(String src, String holder)
throws IOException {
INodeFile file = dir.getFileINode(src);
return checkLease(src, holder, file);
}
private INodeFileUnderConstruction checkLease(String src, String holder, INode file)
throws IOException {
if (file == null || file.isDirectory()) {
Lease lease = leaseManager.getLease(holder);
throw new LeaseExpiredException("No lease on " + src +
" File does not exist. " +
(lease != null ? lease.toString() :
"Holder " + holder +
" does not have any open files."));
}
if (!file.isUnderConstruction()) {
Lease lease = leaseManager.getLease(holder);
throw new LeaseExpiredException("No lease on " + src +
" File is not open for writing. " +
(lease != null ? lease.toString() :
"Holder " + holder +
" does not have any open files."));
}
INodeFileUnderConstruction pendingFile = (INodeFileUnderConstruction) file;
if (holder != null && !pendingFile.getClientName().equals(holder)) {
throw new LeaseExpiredException("Lease mismatch on " + src + " owned by "
+ pendingFile.getClientName() + " but is accessed by " + holder);
}
return pendingFile;
}
/**
* The FSNamesystem will already know the blocks that make up the file.
* Before we return, we make sure that all the file's blocks have
* been reported by datanodes and are replicated correctly.
*/
enum CompleteFileStatus {
OPERATION_FAILED,
STILL_WAITING,
COMPLETE_SUCCESS
}
public CompleteFileStatus completeFile(String src, String holder,
long fileLen, Block lastBlock) throws IOException {
CompleteFileStatus status = completeFileInternal(src, holder, fileLen,
lastBlock);
getEditLog().logSync();
return status;
}
private void checkFilePath(String src, INode[] inodes) throws IOException {
if (inodes.length == 0 || inodes.length == 1) {
throw new IOException("Illegal file path: " + src +
"! Must start from root.");
}
for (int i=0; i<inodes.length-1; i++) {
if (inodes[i]==null || !inodes[i].isDirectory()) {
throw new IOException("Path doesn't exist: " + src);
}
}
}
private CompleteFileStatus completeFileInternal(String src,
String holder,
long fileLen,
Block lastBlock)
throws IOException {
// convert path string into an array of bytes w/o holding lock
byte[][] components = INodeDirectory.getPathComponents(src);
writeLock();
try {
if (NameNode.stateChangeLog.isDebugEnabled()) {
NameNode.stateChangeLog.debug("DIR* NameSystem.completeFile: " + src
+ " for " + holder
+ ((fileLen != -1) ? (" file length " + fileLen) : "")
+ ((lastBlock != null) ? (" last block: " + lastBlock) : ""));
}
if (isInSafeMode()) {
throw new SafeModeException("Cannot complete file " + src, safeMode);
}
INode[] inodes = new INode[components.length];
dir.rootDir.getExistingPathINodes(components, inodes);
checkFilePath(src, inodes);
INode inode = inodes[inodes.length-1];
if (inode != null && !inode.isUnderConstruction() && !inode.isDirectory()
&& fileLen != -1 && lastBlock != null && inode instanceof INodeFile) {
// We assume it is a duplicate call if the file is not under
// construction. In that case, we'll compare file size and
// the last block ID that the client knows, instead of checking
// leases. Then it'll just recommit the edit log and return
// success. If client doesn't send the last block metadata
// (most likely because it uses older protocol), we'll simply
// fail the call.
//
INodeFile inf = (INodeFile) inode;
long sumBlockLen = 0;
for (Block blk : inf.getBlocks()) {
sumBlockLen += blk.getNumBytes();
}
if (sumBlockLen != fileLen) {
throw new IOException(
"Try close a closed file: file size in client side "
+ "doesn't match name-node. client: " + fileLen
+ " name-node: " + sumBlockLen);
}
if (!inf.getLastBlock().equals(lastBlock)) {
throw new IOException(
"Try close a closed file: last block from client side "
+ "doesn't match name-node. client: " + lastBlock
+ " name-node: " + inf.getLastBlock());
}
// we need to write logs again in case the log was not synced
// for the previous request.
dir.closeFile(src, inf);
NameNode.stateChangeLog
.info("DIR* NameSystem.completeFile: process duplicate request: file "
+ src
+ " is closed by "
+ holder
+ ((fileLen != -1) ? (" file length " + fileLen) : "")
+ ((lastBlock != null) ? (" last block: " + lastBlock) : ""));
return CompleteFileStatus.COMPLETE_SUCCESS;
}
INodeFileUnderConstruction pendingFile = checkLease(
src, holder, inode);
Block[] fileBlocks = pendingFile.getBlocks();
if (fileBlocks == null) {
NameNode.stateChangeLog.warn("DIR* NameSystem.completeFile: "
+ "failed to complete " + src
+ " because dir.getFileBlocks() is null " +
" and pendingFile is " +
((pendingFile == null) ? "null" :
("from " + pendingFile.getClientMachine()))
);
return CompleteFileStatus.OPERATION_FAILED;
} else if (!checkFileProgress(pendingFile, true)) {
return CompleteFileStatus.STILL_WAITING;
}
if (fileLen != -1) {
long sumBlockLen = 0;
for (Block blk : fileBlocks) {
sumBlockLen += blk.getNumBytes();
}
if (sumBlockLen != fileLen) {
throw new IOException(
"file size in client side doesn't match the closed file. client: "
+ fileLen + " name-node: " + sumBlockLen);
}
}
finalizeINodeFileUnderConstruction(src, inodes, pendingFile);
} finally {
writeUnlock();
}
if (NameNode.stateChangeLog.isDebugEnabled()) {
NameNode.stateChangeLog.info("DIR* NameSystem.completeFile: file " + src
+ " is closed by " + holder
+ ((fileLen != -1) ? (" file length " + fileLen) : "")
+ ((lastBlock != null) ? (" last block: " + lastBlock) : ""));
} else {
NameNode.stateChangeLog.info("DIR* NameSystem.completeFile: file " + src
+ " is closed by " + holder + " - lease removed");
}
return CompleteFileStatus.COMPLETE_SUCCESS;
}
static Random randBlockId = new Random();
/**
* Allocate a block at the given pending filename
*
* @param src path to the file
* @param inodes INode representing each of the components of src.
* <code>inodes[inodes.length-1]</code> is the INode for the file.
*/
private Block allocateBlock(String src, INode[] inodes) throws IOException {
Block b = new Block(FSNamesystem.randBlockId.nextLong(), 0, 0);
while (isValidBlock(b)) {
b.setBlockId(FSNamesystem.randBlockId.nextLong());
}
b.setGenerationStamp(getGenerationStamp());
b = dir.addBlock(src, inodes, b);
return b;
}
/**
* Check that the indicated file's blocks are present and
* replicated. If not, return false. If checkall is true, then check
* all blocks, otherwise check only penultimate block.
*/
boolean checkFileProgress(INodeFile v, boolean checkall) {
if (checkall) {
//
// check all blocks of the file.
//
int closeFileReplicationMin =
Math.min(v.getReplication(), this.minCloseReplication);
for (Block block : v.getBlocks()) {
int numNodes = blocksMap.numNodes(block);
if (numNodes < closeFileReplicationMin) {
LOG.info(
"Closing INodeFile " + v + " block " + block + " has replication " +
numNodes + " and requires " + closeFileReplicationMin
);
return false;
}
}
} else {
//
// check the penultimate block of this file
//
Block b = v.getPenultimateBlock();
if (b != null) {
int numNodes = blocksMap.numNodes(b);
if (numNodes < this.minReplication) {
LOG.info(
"INodeFile " + v + " block " + b + " has replication " +
numNodes + " and requires " + this.minReplication
);
return false;
}
}
}
return true;
}
/**
* Remove a datanode from the invalidatesSet
*
* @param n datanode
*/
void removeFromInvalidates(String storageID) {
LightWeightHashSet<Block> blocks = recentInvalidateSets.remove(storageID);
if (blocks != null) {
pendingDeletionBlocksCount -= blocks.size();
}
}
/**
* Adds block to list of blocks which will be invalidated on
* specified datanode and log the move
*
* @param b block
* @param n datanode
*/
void addToInvalidates(Block b, DatanodeInfo n, boolean ackRequired) {
addToInvalidatesNoLog(b, n, ackRequired);
NameNode.stateChangeLog.info("BLOCK* NameSystem.addToInvalidates: "
+ b.getBlockName() + " is added to invalidSet of " + n.getName());
}
/**
* Adds block to list of blocks which will be invalidated on
* specified datanode
*
* @param b block
* @param n datanode
*/
void addToInvalidatesNoLog(Block b, DatanodeInfo n, boolean ackRequired) {
// We are the standby avatar and we don't want to add blocks to the
// invalidates list.
if (this.getNameNode().shouldRetryAbsentBlocks()) {
return;
}
LightWeightHashSet<Block> invalidateSet = recentInvalidateSets.get(n
.getStorageID());
if (invalidateSet == null) {
invalidateSet = new LightWeightHashSet<Block>();
recentInvalidateSets.put(n.getStorageID(), invalidateSet);
}
if(!ackRequired){
b.setNumBytes(BlockFlags.NO_ACK);
}
if (invalidateSet.add(b)) {
pendingDeletionBlocksCount++;
}
}
/**
* Adds block to list of blocks which will be invalidated on
* all its datanodes.
*/
private void addToInvalidates(Block b, boolean ackRequired) {
StringBuilder sb = new StringBuilder();
for (Iterator<DatanodeDescriptor> it =
blocksMap.nodeIterator(b); it.hasNext();) {
DatanodeDescriptor node = it.next();
addToInvalidatesNoLog(b, node, ackRequired);
sb.append(node.getName());
sb.append(' ');
}
NameNode.stateChangeLog.info("BLOCK* NameSystem.addToInvalidates: "
+ b.getBlockName() + " is added to invalidSet of " + sb);
}
/**
* dumps the contents of recentInvalidateSets
*/
private void dumpRecentInvalidateSets(PrintWriter out) {
int size = recentInvalidateSets.values().size();
out.println("Metasave: Blocks " + pendingDeletionBlocksCount
+ " waiting deletion from " + size + " datanodes.");
if (size == 0) {
return;
}
for (Map.Entry<String, LightWeightHashSet<Block>> entry : recentInvalidateSets
.entrySet()) {
LightWeightHashSet<Block> blocks = entry.getValue();
if (blocks.size() > 0) {
out.println(datanodeMap.get(entry.getKey()).getName() + blocks);
}
}
}
/**
* Mark the block belonging to datanode as corrupt
*
* @param blk Block to be marked as corrupt
* @param dn Datanode which holds the corrupt replica
*/
public void markBlockAsCorrupt(Block blk, DatanodeInfo dn)
throws IOException {
writeLock();
try {
DatanodeDescriptor node = getDatanode(dn);
if (node == null) {
throw new IOException("Cannot mark block" + blk.getBlockName() +
" as corrupt because datanode " + dn.getName() +
" does not exist. ");
}
final BlockInfo storedBlockInfo = blocksMap.getStoredBlock(blk);
if (storedBlockInfo == null) {
// Check if the replica is in the blockMap, if not
// ignore the request for now. This could happen when BlockScanner
// thread of Datanode reports bad block before Block reports are sent
// by the Datanode on startup
NameNode.stateChangeLog.info("BLOCK NameSystem.markBlockAsCorrupt: " +
"block " + blk + " could not be marked " +
"as corrupt as it does not exists in " +
"blocksMap");
} else {
INodeFile inode = storedBlockInfo.getINode();
if (inode == null) {
NameNode.stateChangeLog.info("BLOCK NameSystem.markBlockAsCorrupt: " +
"block " + blk + " could not be marked " +
"as corrupt as it does not belong to " +
"any file");
addToInvalidates(storedBlockInfo, node, false);
return;
}
// Add this replica to corruptReplicas Map
if (!corruptReplicas.addToCorruptReplicasMap(storedBlockInfo, node)) {
return;
}
NumberReplicas num = countNodes(storedBlockInfo);
if (num.liveReplicas() > inode.getReplication()) {
// the block is over-replicated so invalidate the replicas immediately
invalidateBlock(storedBlockInfo, node, true);
} else if (isPopulatingReplQueues()) {
// add the block to neededReplication
int numCurrentReplicas = num.liveReplicas() +
pendingReplications.getNumReplicas(storedBlockInfo);
updateNeededReplicationQueue(storedBlockInfo, -1, numCurrentReplicas,
num.decommissionedReplicas, node, inode.getReplication());
}
}
} finally {
writeUnlock();
}
}
/**
* Invalidates the given block on the given datanode.
*/
private void invalidateBlock(Block blk, DatanodeInfo dn, boolean ackRequired)
throws IOException {
assert (hasWriteLock());
NameNode.stateChangeLog.info("DIR* NameSystem.invalidateBlock: "
+ blk + " on "
+ dn.getName());
DatanodeDescriptor node = getDatanode(dn);
if (node == null) {
throw new IOException("Cannot invalidate block " + blk +
" because datanode " + dn.getName() +
" does not exist.");
}
// Check how many copies we have of the block. If we have at least one
// copy on a live node, then we can delete it.
int count = countNodes(blk).liveReplicas();
if (count > 1) {
// delete with ACK
addToInvalidates(blk, dn, ackRequired);
removeStoredBlock(blk, node);
if (NameNode.stateChangeLog.isDebugEnabled()) {
NameNode.stateChangeLog.debug("BLOCK* NameSystem.invalidateBlocks: "
+ blk + " on "
+ dn.getName() + " listed for deletion.");
}
} else {
NameNode.stateChangeLog.info("BLOCK* NameSystem.invalidateBlocks: "
+ blk + " on "
+ dn.getName() + " is the only copy and was not deleted.");
}
}
////////////////////////////////////////////////////////////////
// Here's how to handle block-copy failure during client write:
// -- As usual, the client's write should result in a streaming
// backup write to a k-machine sequence.
// -- If one of the backup machines fails, no worries. Fail silently.
// -- Before client is allowed to close and finalize file, make sure
// that the blocks are backed up. Namenode may have to issue specific backup
// commands to make up for earlier datanode failures. Once all copies
// are made, edit namespace and return to client.
////////////////////////////////////////////////////////////////
/**
* Create the hard link from src file to the dest file.
*/
public boolean hardLinkTo(String src, String dst) throws IOException {
INode dstNode = hardLinkToInternal(src, dst);
getEditLog().logSync(false);
if (dstNode != null && auditLog.isInfoEnabled()) {
logAuditEvent(getCurrentUGI(), Server.getRemoteIp(),
"hardlink", src, dst, dstNode);
}
return dstNode != null;
}
private INode hardLinkToInternal(String src, String dst) throws IOException {
// Check the dst name
String[] dstNames = INode.getPathNames(dst);
if (!pathValidator.isValidName(dst, dstNames)) {
numInvalidFilePathOperations++;
throw new IOException("Invalid name: " + dst);
}
// Get the src and dst components
String[] srcNames = INode.getPathNames(src);
byte[][] srcComponents = INode.getPathComponents(srcNames);
byte[][] dstComponents = INode.getPathComponents(dstNames);
if (NameNode.stateChangeLog.isDebugEnabled()) {
NameNode.stateChangeLog.debug("DIR* NameSystem.hardLinkTo: src: " + src + " dst: " + dst);
}
writeLock();
try {
if (isInSafeMode()) {
throw new SafeModeException("Cannot hard link to src: " + src, safeMode);
}
INode[] srcInodes = new INode[srcComponents.length];
dir.rootDir.getExistingPathINodes(srcComponents, srcInodes);
INode[] dstInodes = new INode[dstComponents.length];
dir.rootDir.getExistingPathINodes(dstComponents, dstInodes);
// Check permission
if (isPermissionEnabled) {
checkParentAccess(src, srcInodes, FsAction.EXECUTE);
checkParentAccess(dst, dstInodes, FsAction.WRITE_EXECUTE);
}
// Create the hard link
if (dir.hardLinkTo(src, srcNames[srcNames.length-1],
srcComponents[srcComponents.length-1], srcInodes,
dst, dstInodes, dstComponents[dstComponents.length-1])) {
return dstInodes[dstInodes.length-1];
}
return null;
} finally {
writeUnlock();
}
}
/**
* Change the indicated filename.
*/
public boolean renameTo(String src, String dst) throws IOException {
INode dstNode = renameToInternal(src, dst);
getEditLog().logSync(false);
if (dstNode != null && auditLog.isInfoEnabled()) {
logAuditEvent(getCurrentUGI(),
Server.getRemoteIp(),
"rename", src, dst, dstNode);
}
return dstNode != null;
}
private INode renameToInternal(String src, String dst
) throws IOException {
String[] dstNames = INode.getPathNames(dst);
if (!pathValidator.isValidName(dst, dstNames)) {
numInvalidFilePathOperations++;
throw new IOException("Invalid name: " + dst);
}
String[] srcNames = INode.getPathNames(src);
byte[][] srcComponents = INode.getPathComponents(srcNames);
byte[][] dstComponents = INode.getPathComponents(dstNames);
if (NameNode.stateChangeLog.isDebugEnabled()) {
NameNode.stateChangeLog.debug("DIR* NameSystem.renameTo: " + src + " to " + dst);
}
writeLock();
try {
if (isInSafeMode()) {
throw new SafeModeException("Cannot rename " + src, safeMode);
}
INode[] srcInodes = new INode[srcComponents.length];
dir.rootDir.getExistingPathINodes(srcComponents, srcInodes);
INode[] dstInodes = new INode[dstComponents.length];
dir.rootDir.getExistingPathINodes(dstComponents, dstInodes);
INode dstNode = dstInodes[dstInodes.length-1];
String actualDst = dst;
byte[] lastDstComponent = dstComponents[dstComponents.length-1];
if (isPermissionEnabled) {
//We should not be doing this. This is move() not renameTo().
//but for now,
checkParentAccess(src, srcInodes, FsAction.WRITE);
INode[] actualDstInodes = dstInodes;
if (dstNode != null && dstNode.isDirectory()) {
actualDst = dst + Path.SEPARATOR + srcNames[srcNames.length-1];
actualDstInodes = Arrays.copyOf(dstInodes, dstInodes.length+1);
lastDstComponent = srcComponents[srcComponents.length-1];
actualDstInodes[actualDstInodes.length-1] = ((INodeDirectory)dstNode).
getChildINode(lastDstComponent);
}
checkAncestorAccess(actualDst, actualDstInodes, FsAction.WRITE);
}
if (neverDeletePaths.contains(src)) {
NameNode.stateChangeLog.warn("DIR* NameSystem.delete: " +
" Trying to rename a whitelisted path " + src +
" by user " + getCurrentUGI() +
" from server " + Server.getRemoteIp());
throw new IOException("Rename a whitelisted directory is not allowed " + src);
}
HdfsFileStatus dinfo = dstNode==null ? null : FSDirectory.getHdfsFileInfo(dstNode);
if (dir.renameTo(src, srcNames[srcNames.length-1],
srcComponents[srcComponents.length-1], srcInodes,
dst, dstInodes, lastDstComponent)) {
changeLease(src, dst, dinfo); // update lease with new filename
return dstInodes[dstInodes.length-1];
}
return null;
} finally {
writeUnlock();
}
}
/**
* Remove the indicated filename from namespace. If the filename
* is a directory (non empty) and recursive is set to false then throw exception.
*/
public boolean delete(String src, boolean recursive) throws IOException {
boolean status = deleteInternal(src, null, recursive, true);
getEditLog().logSync(false);
if (status && auditLog.isInfoEnabled()) {
logAuditEvent(getCurrentUGI(),
Server.getRemoteIp(),
"delete", src, null, null);
}
return status;
}
static void incrDeletedFileCount(FSNamesystem fsnamesystem, int count) {
if (fsnamesystem != null)
NameNode.getNameNodeMetrics().numFilesDeleted.inc(count);
}
/**
* Remove the indicated filename from the namespace. This may
* invalidate some blocks that make up the file.
*/
boolean deleteInternal(String src, INode[] inodes, boolean recursive,
boolean enforcePermission) throws IOException {
ArrayList<Block> collectedBlocks = new ArrayList<Block>();
INode targetNode = null;
byte[][] components = inodes == null ?
INodeDirectory.getPathComponents(src) : null;
writeLock();
try {
if (NameNode.stateChangeLog.isDebugEnabled()) {
NameNode.stateChangeLog.debug("DIR* NameSystem.delete: " + src);
}
if (isInSafeMode()) {
throw new SafeModeException("Cannot delete " + src, safeMode);
}
if (inodes == null) {
inodes = new INode[components.length];
dir.rootDir.getExistingPathINodes(components, inodes);
}
if (enforcePermission && isPermissionEnabled) {
checkPermission(src, inodes, false, null, FsAction.WRITE, null, FsAction.ALL);
}
if (neverDeletePaths.contains(src)) {
NameNode.stateChangeLog.warn("DIR* NameSystem.delete: " +
" Trying to delete a whitelisted path " + src +
" by user " + getCurrentUGI() +
" from server " + Server.getRemoteIp());
throw new IOException("Deleting a whitelisted directory is not allowed. " + src);
}
if ((!recursive) && (!dir.isDirEmpty(inodes[inodes.length-1]))) {
throw new IOException(src + " is non empty");
}
targetNode = dir.delete(src, inodes, collectedBlocks,
BLOCK_DELETION_INCREMENT);
if (targetNode == null) {
return false;
}
} finally {
writeUnlock();
}
while (targetNode.parent != null) {
// Interatively Remove blocks
collectedBlocks.clear();
// sleep to make sure that the lock can be grabbed by another thread
try {
Thread.sleep(1);
} catch (InterruptedException e) {
throw new InterruptedIOException(e.getMessage());
}
writeLock();
try {
int filesRemoved = targetNode.collectSubtreeBlocksAndClear(
collectedBlocks, BLOCK_DELETION_INCREMENT);
incrDeletedFileCount(this, filesRemoved);
removeBlocks(collectedBlocks);
} finally {
writeUnlock();
}
}
return true;
}
/**
* From the given list, incrementally remove the blocks. Add the blocks
* to invalidates, and set a flag that explicit ACK from DataNode is not
* required. This function should be used only for deleting entire files.
*/
private void removeBlocks(List<Block> blocks) {
if (blocks == null) {
return;
}
for (Block b : blocks) {
removeFromExcessReplicateMap(b);
neededReplications.remove(b, -1);
corruptReplicas.removeFromCorruptReplicasMap(b);
if (pendingReplications != null) {
int replicas = pendingReplications.getNumReplicas(b);
for (int i = 0; i < replicas; i++) {
pendingReplications.remove(b);
}
}
addToInvalidates(b, false);
blocksMap.removeBlock(b);
}
}
/**
* Remove the blocks from the given list. Also, remove the path. Add the
* blocks to invalidates, and set a flag that explicit ACK from DataNode is
* not required. This function should be used only for deleting entire files.
*/
void removePathAndBlocks(String src, List<Block> blocks) throws IOException {
// No need for lock until we start accepting requests from clients.
assert (!nameNode.isRpcServerRunning() || hasWriteLock());
leaseManager.removeLeaseWithPrefixPath(src);
removeBlocks(blocks);
}
/**
* Get the file info for a specific file.
*
* @param src The string representation of the path to the file
* @return object containing information regarding the file
* or null if file not found
* @throws IOException if permission to access file is denied by the system
*/
FileStatus getFileInfo(String src) throws IOException {
src = dir.normalizePath(src);
INode[] inodes = dir.getExistingPathINodes(src);
if (isPermissionEnabled) {
checkTraverse(src, inodes);
}
return dir.getFileInfo(src, inodes[inodes.length-1]);
}
FileStatusExtended getFileInfoExtended(String src) throws IOException {
Lease lease = leaseManager.getLeaseByPath(src);
String leaseHolder = (lease == null) ? "" : lease.getHolder();
return getFileInfoExtended(src, leaseHolder);
}
/**
* Get the extended file info for a specific file.
*
* @param src
* The string representation of the path to the file
* @return object containing information regarding the file or null if file
* not found
* @throws IOException
* if permission to access file is denied by the system
*/
FileStatusExtended getFileInfoExtended(String src, String leaseHolder)
throws IOException {
src = dir.normalizePath(src);
INode[] inodes = dir.getExistingPathINodes(src);
return dir.getFileInfoExtended(src, inodes[inodes.length - 1], leaseHolder);
}
/**
* Get the file info for a specific file.
*
* @param src The string representation of the path to the file
* @return object containing information regarding the file
* or null if file not found
* @throws IOException if permission to access file is denied by the system
*/
HdfsFileStatus getHdfsFileInfo(String src) throws IOException {
if (isPermissionEnabled) {
INode[] inodes = dir.getExistingPathINodes(src);
checkTraverse(src, inodes);
}
return dir.getHdfsFileInfo(src);
}
/** Get the block info for a specific block id.
* @param id The id of the block for which info is requested
* @return object containing information regarding the block
* or null if block not found
*/
BlockInfo getBlockInfo(Block b) {
return blocksMap.getBlockInfo(b);
}
/**
* Fetch the list of files that have been open longer than a
* specified amount of time.
* @param prefix path prefix specifying subset of files to examine
* @param millis select files that have been open longer that this
* @param where to start searching, or null
* @return array of OpenFileInfo objects
* @throw IOException
*/
public OpenFileInfo[] iterativeGetOpenFiles(
String prefix, int millis, String start) {
return leaseManager.iterativeGetOpenFiles(prefix, millis, start);
}
/**
* Create all the necessary directories
*/
public boolean mkdirs(String src, PermissionStatus permissions
) throws IOException {
INode newNode = mkdirsInternal(src, permissions);
getEditLog().logSync(false);
if (newNode != null && auditLog.isInfoEnabled()) {
logAuditEvent(getCurrentUGI(),
Server.getRemoteIp(),
"mkdirs", src, null, newNode);
}
return newNode != null;
}
/**
* Create all the necessary directories
*/
private INode mkdirsInternal(String src,
PermissionStatus permissions)
throws IOException {
src = dir.normalizePath(src);
// tokenize the src into components
String[] names = INodeDirectory.getPathNames(src);
if (!pathValidator.isValidName(src, names)) {
numInvalidFilePathOperations++;
throw new IOException("Invalid directory name: " + src);
}
// convert the names into an array of bytes w/o holding lock
byte[][] components = INodeDirectory.getPathComponents(names);
INode[] inodes = new INode[components.length];
writeLock();
try {
if (NameNode.stateChangeLog.isDebugEnabled()) {
NameNode.stateChangeLog.debug("DIR* NameSystem.mkdirs: " + src);
}
dir.rootDir.getExistingPathINodes(components, inodes);
if (isPermissionEnabled) {
checkTraverse(src, inodes);
}
INode lastINode = inodes[inodes.length-1];
if (lastINode !=null && lastINode.isDirectory()) {
// all the users of mkdirs() are used to expect 'true' even if
// a new directory is not created.
return lastINode;
}
if (isInSafeMode()) {
throw new SafeModeException("Cannot create directory " + src, safeMode);
}
if (isPermissionEnabled) {
checkAncestorAccess(src, inodes, FsAction.WRITE);
}
// validate that we have enough inodes. This is, at best, a
// heuristic because the mkdirs() operation migth need to
// create multiple inodes.
checkFsObjectLimit();
if (!dir.mkdirs(src, names, components, inodes, inodes.length, permissions, false, now())) {
throw new IOException("Invalid directory name: " + src);
}
return inodes[inodes.length-1];
} finally {
writeUnlock();
}
}
ContentSummary getContentSummary(String src) throws IOException {
INode[] inodes = dir.getExistingPathINodes(src);
if (isPermissionEnabled) {
checkPermission(src, inodes, false, null, null, null, FsAction.READ_EXECUTE);
}
readLock();
try {
if (auditLog.isInfoEnabled()) {
logAuditEvent(getCurrentUGI(),
Server.getRemoteIp(),
"getContentSummary", src, null,
getLastINode(inodes));
}
return dir.getContentSummary(src);
} finally {
readUnlock();
}
}
/**
* Set the namespace quota and diskspace quota for a directory.
* See {@link ClientProtocol#setQuota(String, long, long)} for the
* contract.
*/
void setQuota(String path, long nsQuota, long dsQuota) throws IOException {
writeLock();
try {
if (isInSafeMode()) {
throw new SafeModeException("Cannot setQuota " + path, safeMode);
}
if (isPermissionEnabled) {
checkSuperuserPrivilege();
}
dir.setQuota(path, nsQuota, dsQuota);
} finally {
writeUnlock();
}
getEditLog().logSync(false);
}
/**
* Persist all metadata about this file.
*
* @param src The string representation of the path
* @param clientName The string representation of the client
* @throws IOException if path does not exist
*/
void fsync(String src, String clientName) throws IOException {
NameNode.stateChangeLog.info("BLOCK* NameSystem.fsync: file "
+ src + " for " + clientName);
writeLock();
try {
if (isInSafeMode()) {
throw new SafeModeException("Cannot fsync file " + src, safeMode);
}
INodeFileUnderConstruction pendingFile = checkLease(src, clientName);
// If the block has a length of zero, set it to size 1 so
// that lease recovery will not discard it.
Block last = pendingFile.getLastBlock();
if (last.getNumBytes() == 0) {
last.setNumBytes(1);
}
dir.persistBlocks(src, pendingFile);
} finally {
writeUnlock();
}
getEditLog().logSync();
}
/**
* This is invoked when a lease expires. On lease expiry,
* all the files that were written from that dfsclient should be
* recovered.
*/
void internalReleaseLease(Lease lease, String src,
INodeFileUnderConstruction pendingFile) throws IOException {
if (lease.hasPath()) {
// make a copy of the paths because internalReleaseLeaseOne removes
// pathnames from the lease record.
String[] leasePaths = new String[lease.getPaths().size()];
lease.getPaths().toArray(leasePaths);
LOG.info("Recovering lease: " + lease + " for paths "
+ Arrays.toString(leasePaths));
for (String p: leasePaths) {
internalReleaseLeaseOne(lease, p);
}
} else {
internalReleaseLeaseOne(lease, src, pendingFile, false);
}
}
/**
* Move a file that is being written to be immutable.
*
* @param src The filename
* @param lease The lease for the client creating the file
*/
void internalReleaseLeaseOne(Lease lease, String src) throws IOException {
internalReleaseLeaseOne(lease, src, false);
}
void internalReleaseLeaseOne(Lease lease, String src,
boolean discardLastBlock) throws IOException {
assert hasWriteLock();
INodeFile iFile = dir.getFileINode(src);
if (iFile == null) {
final String message = "DIR* NameSystem.internalReleaseCreate: "
+ "attempt to release a create lock on "
+ src + " file does not exist.";
NameNode.stateChangeLog.warn(message);
throw new IOException(message);
}
if (!iFile.isUnderConstruction()) {
final String message = "DIR* NameSystem.internalReleaseCreate: "
+ "attempt to release a create lock on "
+ src + " but file is already closed.";
NameNode.stateChangeLog.warn(message);
throw new IOException(message);
}
internalReleaseLeaseOne(lease, src, (INodeFileUnderConstruction)iFile, discardLastBlock);
}
/**
* Move a file that is being written to be immutable.
*
* @param src The filename
* @param lease The lease for the client creating the file
* @return true if lease recovery has completed, false if the client has to retry
*/
boolean internalReleaseLeaseOne(Lease lease, String src,
INodeFileUnderConstruction pendingFile, boolean discardLastBlock) throws IOException {
// if it is safe to discard the last block, then do so
if (discardLastBlock && discardDone(pendingFile, src)) {
// Have client retry lease recovery.
return false;
}
// Initialize lease recovery for pendingFile. If there are no blocks
// associated with this file, then reap lease immediately. Otherwise
// renew the lease and trigger lease recovery.
if (pendingFile.getTargets() == null ||
pendingFile.getTargets().length == 0) {
if (pendingFile.getBlocks().length == 0) {
finalizeINodeFileUnderConstruction(src, pendingFile);
NameNode.stateChangeLog.warn("BLOCK*"
+ " internalReleaseLease: No blocks found, lease removed for " + src);
// Tell the client that lease recovery has succeeded.
return true;
}
// setup the Inode.targets for the last block from the blocksMap
//
Block[] blocks = pendingFile.getBlocks();
Block last = blocks[blocks.length - 1];
DatanodeDescriptor[] targets =
new DatanodeDescriptor[blocksMap.numNodes(last)];
Iterator<DatanodeDescriptor> it = blocksMap.nodeIterator(last);
for (int i = 0; it != null && it.hasNext(); i++) {
targets[i] = it.next();
}
pendingFile.setTargets(targets);
}
// start lease recovery of the last block for this file.
pendingFile.assignPrimaryDatanode();
Lease reassignedLease = reassignLease(
lease, src, HdfsConstants.NN_RECOVERY_LEASEHOLDER, pendingFile
);
getEditLog().logOpenFile(src, pendingFile);
leaseManager.renewLease(reassignedLease);
return false; // Have the client retry lease recovery.
}
// If we are part of recoverLease call and no fsync has
// been called on the last block so far, then it is safe to drop
// the last block completely.
private boolean discardDone(INodeFileUnderConstruction pendingFile,
String src) throws IOException {
Block[] blocks = pendingFile.getBlocks();
if (blocks == null || blocks.length == 0) {
return false;
}
Block last = blocks[blocks.length-1];
if (last.getNumBytes() == 0) {
dir.removeBlock(src, pendingFile, last);
finalizeINodeFileUnderConstruction(src, pendingFile);
NameNode.stateChangeLog.warn("BLOCK*" +
" internalReleaseLease: discarded last block " + last +
" , lease removed for " + src);
return true;
}
return false;
}
Lease reassignLease(Lease lease, String src, String newHolder,
INodeFileUnderConstruction pendingFile) {
if(newHolder == null)
return lease;
pendingFile.setClientName(newHolder);
return leaseManager.reassignLease(lease, src, newHolder);
}
private void finalizeINodeFileUnderConstruction(String src,
INodeFileUnderConstruction pendingFile) throws IOException {
finalizeINodeFileUnderConstruction(src, null, pendingFile);
}
private void finalizeINodeFileUnderConstruction(String src,
INode[] inodes, INodeFileUnderConstruction pendingFile) throws IOException {
// Put last block in needed replication queue if uder replicated
replicateLastBlock(src, pendingFile);
leaseManager.removeLease(pendingFile.getClientName(), src);
DatanodeDescriptor[] descriptors = pendingFile.getTargets();
if (descriptors != null) {
for (DatanodeDescriptor node : descriptors) {
node.removeINode(pendingFile);
}
}
// The file is no longer pending.
// Create permanent INode, update blockmap
INodeFile newFile = pendingFile.convertToInodeFile();
dir.replaceNode(src, inodes, pendingFile, newFile, true);
// close file and persist block allocations for this file
dir.closeFile(src, newFile);
}
/**
* corrupts a file by:
* 1. removing all targets of the last block
*/
void corruptFileForTesting(String src) throws IOException {
INodeFile inode = dir.getFileINode(src);
if (inode.isUnderConstruction()) {
INodeFileUnderConstruction pendingFile =
(INodeFileUnderConstruction) inode;
BlockInfo[] blocks = pendingFile.getBlocks();
if (blocks != null && blocks.length >= 1) {
BlockInfo lastBlockInfo = blocks[blocks.length - 1];
pendingFile.setLastBlock(
lastBlockInfo,
new DatanodeDescriptor[0]
);
}
}
}
// public only for testing
public void commitBlockSynchronization(Block lastblock,
long newgenerationstamp, long newlength,
boolean closeFile, boolean deleteblock, DatanodeID[] newtargets
) throws IOException {
LOG.info("commitBlockSynchronization(lastblock=" + lastblock
+ ", newgenerationstamp=" + newgenerationstamp
+ ", newlength=" + newlength
+ ", newtargets=" + Arrays.asList(newtargets)
+ ", closeFile=" + closeFile
+ ", deleteBlock=" + deleteblock
+ ")");
String src = null;
writeLock();
try {
if (isInSafeMode()) {
throw new SafeModeException("Cannot commitBlockSynchronization "
+ lastblock, safeMode);
}
Block blockWithWildcardGenstamp = new Block(lastblock.getBlockId());
final BlockInfo oldblockinfo = blocksMap.getStoredBlock(blockWithWildcardGenstamp);
if (oldblockinfo == null) {
throw new IOException("Block (=" + lastblock + ") not found");
}
if (!deleteblock
&& lastblock.getGenerationStamp() != oldblockinfo
.getGenerationStamp()
&& oldblockinfo.getGenerationStamp() >= newgenerationstamp) {
throw new IOException("Try to update block " + oldblockinfo
+ " to generation stamp " + newgenerationstamp);
}
INodeFile iFile = oldblockinfo.getINode();
if (!iFile.isUnderConstruction()) {
throw new IOException("Unexpected block (=" + lastblock
+ ") since the file (=" + iFile.getLocalName()
+ ") is not under construction");
}
INodeFileUnderConstruction pendingFile = (INodeFileUnderConstruction) iFile;
// Remove old block from blocks map. This always have to be done
// because the generation stamp of this block is changing.
blocksMap.removeBlock(oldblockinfo);
if (deleteblock) {
pendingFile.removeBlock(lastblock);
} else {
// update last block, construct newblockinfo and add it to the blocks map
lastblock.set(lastblock.getBlockId(), newlength, newgenerationstamp);
final BlockInfo newblockinfo = blocksMap.addINode(lastblock, pendingFile);
// find the DatanodeDescriptor objects
// There should be no locations in the blocksMap till now because the
// file is underConstruction
DatanodeDescriptor[] descriptors = null;
List<DatanodeDescriptor> descriptorsList =
new ArrayList<DatanodeDescriptor>(newtargets.length);
for(int i = 0; i < newtargets.length; i++) {
// We don't use getDatanode here since that method can
// throw. If we were to throw an exception during this commit
// process, we'd fall out of sync since DNs have already finalized
// the block with the new GS.
DatanodeDescriptor node =
datanodeMap.get(newtargets[i].getStorageID());
if (node != null) {
if (closeFile) {
// If we aren't closing the file, we shouldn't add it to the
// block list for the node, since the block is still under
// construction there. (in getAdditionalBlock, for example
// we don't add to the block map for the targets)
node.addBlock(newblockinfo);
}
descriptorsList.add(node);
} else {
LOG.error("commitBlockSynchronization included a target DN " +
newtargets[i] + " which is not known to NN. Ignoring.");
}
}
if (!descriptorsList.isEmpty()) {
descriptors = descriptorsList.toArray(new DatanodeDescriptor[0]);
}
// add locations into the INodeUnderConstruction
pendingFile.setLastBlock(newblockinfo, descriptors);
}
// If this commit does not want to close the file, persist
// blocks only if append is supported and return
src = pendingFile.getFullPathName();
if (!closeFile) {
if (supportAppends) {
dir.persistBlocks(src, pendingFile);
}
} else {
//remove lease, close file
finalizeINodeFileUnderConstruction(src, pendingFile);
}
} finally {// end of synchronized section
writeUnlock();
}
if (closeFile || supportAppends) {
getEditLog().logSync();
}
LOG.info("commitBlockSynchronization(newblock=" + lastblock
+ ", file=" + src + ") successful");
}
/**
* Renew the lease(s) held by the given client
*/
void renewLease(String holder) throws IOException {
readLock();
try {
if (isInSafeMode()) {
throw new SafeModeException("Cannot renew lease for " + holder, safeMode);
}
leaseManager.renewLease(holder);
} finally {
readUnlock();
}
}
private void getListingCheck(String src) throws IOException {
getListingCheck(src, dir.getExistingPathINodes(src));
}
private void getListingCheck(String src, INode[] inodes) throws IOException {
if (isPermissionEnabled) {
if (FSDirectory.isDir(inodes[inodes.length-1])) {
checkPathAccess(src, inodes, FsAction.READ_EXECUTE);
} else {
checkTraverse(src, inodes);
}
}
}
/**
* Get a listing of all files at 'src'. The Object[] array
* exists so we can return file attributes (soon to be implemented)
*/
public FileStatus[] getListing(String src) throws IOException {
getListingCheck(src);
FileStatus[] stats = dir.getListing(src);
if (auditLog.isInfoEnabled()) {
logAuditEvent(getCurrentUGI(),
Server.getRemoteIp(),
"listStatus", src, null, null);
}
return stats;
}
/**
* Get a listing of all files at 'src'. The Object[] array
* exists so we can return file attributes (soon to be implemented)
*/
public HdfsFileStatus[] getHdfsListing(String src) throws IOException {
getListingCheck(src);
HdfsFileStatus[] stats = dir.getHdfsListing(src);
if (auditLog.isInfoEnabled()) {
logAuditEvent(getCurrentUGI(),
Server.getRemoteIp(),
"listStatus", src, null, null);
}
return stats;
}
/**
* Get a partial listing of the indicated directory
*
* @param src the directory name
* @param startAfter the name to start after
* @param needLocation if blockLocations need to be returned
* @return a partial listing starting after startAfter
*/
public DirectoryListing getPartialListing(String src, byte[] startAfter,
boolean needLocation)
throws IOException {
DirectoryListing stats;
src = dir.normalizePath(src);
byte[][] names = INode.getPathComponents(src);
INode[] inodes = new INode[names.length];
readLock();
try {
dir.rootDir.getExistingPathINodes(names, inodes);
getListingCheck(src, inodes);
stats = dir.getPartialListing(src, inodes[inodes.length-1],
startAfter, needLocation);
} finally {
readUnlock();
}
if (auditLog.isInfoEnabled()) {
logAuditEvent(getCurrentUGI(),
Server.getRemoteIp(),
"listStatus", src, null, null);
}
return stats;
}
/////////////////////////////////////////////////////////
//
// These methods are called by datanodes
//
/////////////////////////////////////////////////////////
/**
* Register Datanode.
* <p/>
* The purpose of registration is to identify whether the new datanode
* serves a new data storage, and will report new data block copies,
* which the namenode was not aware of; or the datanode is a replacement
* node for the data storage that was previously served by a different
* or the same (in terms of host:port) datanode.
* The data storages are distinguished by their storageIDs. When a new
* data storage is reported the namenode issues a new unique storageID.
* <p/>
* Finally, the namenode returns its namespaceID as the registrationID
* for the datanodes.
* namespaceID is a persistent attribute of the name space.
* The registrationID is checked every time the datanode is communicating
* with the namenode.
* Datanodes with inappropriate registrationID are rejected.
* If the namenode stops, and then restarts it can restore its
* namespaceID and will continue serving the datanodes that has previously
* registered with the namenode without restarting the whole cluster.
*
* @see org.apache.hadoop.hdfs.server.datanode.DataNode#register()
*/
public void registerDatanode(DatanodeRegistration nodeReg
) throws IOException {
writeLock();
try {
String dnAddress = Server.getRemoteAddress();
if (dnAddress == null) {
// Mostly called inside an RPC.
// But if not, use address passed by the data-node.
dnAddress = nodeReg.getHost();
}
// check if the datanode is allowed to be connect to the namenode
if (!verifyNodeRegistration(nodeReg, dnAddress)) {
throw new DisallowedDatanodeException(nodeReg);
}
String hostName = nodeReg.getHost();
// update the datanode's name with ip:port
DatanodeID dnReg = new DatanodeID(dnAddress + ":" + nodeReg.getPort(),
nodeReg.getStorageID(),
nodeReg.getInfoPort(),
nodeReg.getIpcPort());
nodeReg.updateRegInfo(dnReg);
NameNode.stateChangeLog.info(
"BLOCK* NameSystem.registerDatanode: "
+ "node registration from " + nodeReg.getName()
+ " storage " + nodeReg.getStorageID());
DatanodeDescriptor nodeS = datanodeMap.get(nodeReg.getStorageID());
DatanodeDescriptor nodeN = host2DataNodeMap.getDatanodeByName(nodeReg.getName());
if (nodeN != null && nodeN != nodeS) {
NameNode.LOG.info("BLOCK* NameSystem.registerDatanode: "
+ "node from name: " + nodeN.getName());
// nodeN previously served a different data storage,
// which is not served by anybody anymore.
removeDatanode(nodeN);
// physically remove node from datanodeMap
wipeDatanode(nodeN);
nodeN = null;
}
if (nodeS != null) {
if (nodeN == nodeS) {
// The same datanode has been just restarted to serve the same data
// storage. We do not need to remove old data blocks, the delta will
// be calculated on the next block report from the datanode
if (NameNode.stateChangeLog.isDebugEnabled()) {
NameNode.stateChangeLog.debug("BLOCK* NameSystem.registerDatanode: "
+ "node restarted.");
}
} else {
// nodeS is found
/* The registering datanode is a replacement node for the existing
data storage, which from now on will be served by a new node.
If this message repeats, both nodes might have same storageID
by (insanely rare) random chance. User needs to restart one of the
nodes with its data cleared (or user can just remove the StorageID
value in "VERSION" file under the data directory of the datanode,
but this is might not work if VERSION file format has changed
*/
NameNode.stateChangeLog.info("BLOCK* NameSystem.registerDatanode: "
+ "node " + nodeS.getName()
+ " is replaced by " + nodeReg.getName() +
" with the same storageID " +
nodeReg.getStorageID());
}
// update cluster map
clusterMap.remove(nodeS);
nodeS.updateRegInfo(nodeReg);
nodeS.setHostName(hostName);
nodeS.setDisallowed(false); // Node is in the include list
// resolve network location
resolveNetworkLocation(nodeS);
clusterMap.add(nodeS);
// also treat the registration message as a heartbeat
synchronized (heartbeats) {
if (!heartbeats.contains(nodeS)) {
heartbeats.add(nodeS);
//update its timestamp
nodeS.updateHeartbeat(0L, 0L, 0L, 0L, 0);
nodeS.isAlive = true;
}
}
checkDecommissioning(nodeS, dnAddress);
return;
}
// this is a new datanode serving a new data storage
if (nodeReg.getStorageID().equals("")) {
// this data storage has never been registered
// it is either empty or was created by pre-storageID version of DFS
nodeReg.storageID = newStorageID();
if (NameNode.stateChangeLog.isDebugEnabled()) {
NameNode.stateChangeLog.debug(
"BLOCK* NameSystem.registerDatanode: "
+ "new storageID " + nodeReg.getStorageID() + " assigned.");
}
}
// register new datanode
DatanodeDescriptor nodeDescr
= new DatanodeDescriptor(nodeReg, NetworkTopology.DEFAULT_RACK, hostName);
resolveNetworkLocation(nodeDescr);
unprotectedAddDatanode(nodeDescr);
clusterMap.add(nodeDescr);
checkDecommissioning(nodeDescr, dnAddress);
// also treat the registration message as a heartbeat
synchronized (heartbeats) {
heartbeats.add(nodeDescr);
nodeDescr.isAlive = true;
// no need to update its timestamp
// because its is done when the descriptor is created
}
return;
} finally {
writeUnlock();
}
}
/* Resolve a node's network location */
void resolveNetworkLocation(DatanodeInfo node) {
List<String> names = new ArrayList<String>(1);
if (dnsToSwitchMapping instanceof CachedDNSToSwitchMapping) {
// get the node's IP address
names.add(node.getHost());
} else {
// get the node's host name
String hostName = node.getHostName();
int colon = hostName.indexOf(":");
hostName = (colon == -1) ? hostName : hostName.substring(0, colon);
names.add(hostName);
}
// resolve its network location
List<String> rName = dnsToSwitchMapping.resolve(names);
String networkLocation;
if (rName == null) {
LOG.error("The resolve call returned null! Using " +
NetworkTopology.DEFAULT_RACK + " for host " + names);
networkLocation = NetworkTopology.DEFAULT_RACK;
} else {
networkLocation = rName.get(0);
}
node.setNetworkLocation(networkLocation);
}
/**
* Get registrationID for datanodes based on the namespaceID.
*
* @return registration ID
* @see #registerDatanode(DatanodeRegistration)
* @see FSImage#newNamespaceID()
*/
public String getRegistrationID() {
return Storage.getRegistrationID(dir.fsImage);
}
/**
* Generate new storage ID.
*
* @return unique storage ID
* <p/>
* Note: that collisions are still possible if somebody will try
* to bring in a data storage from a different cluster.
*/
private String newStorageID() {
String newID = null;
while (newID == null) {
newID = "DS" + Integer.toString(r.nextInt());
if (datanodeMap.get(newID) != null) {
newID = null;
}
}
return newID;
}
private boolean isDatanodeDead(DatanodeDescriptor node) {
return (node.getLastUpdate() <
(now() - heartbeatExpireInterval));
}
void setDatanodeDead(DatanodeDescriptor node) throws IOException {
node.setLastUpdate(0);
}
/**
* The given node has reported in. This method should:
* 1) Record the heartbeat, so the datanode isn't timed out
* 2) Adjust usage stats for future block allocation
* <p/>
* If a substantial amount of time passed since the last datanode
* heartbeat then request an immediate block report.
*
* @return an array of datanode commands
* @throws IOException
*/
DatanodeCommand[] handleHeartbeat(DatanodeRegistration nodeReg,
long capacity, long dfsUsed, long remaining, long namespaceUsed,
int xceiverCount, int xmitsInProgress)
throws IOException {
DatanodeCommand cmd = null;
synchronized (heartbeats) {
synchronized (datanodeMap) {
DatanodeDescriptor nodeinfo = null;
try {
nodeinfo = getDatanode(nodeReg);
} catch (UnregisteredDatanodeException e) {
return new DatanodeCommand[]{DatanodeCommand.REGISTER};
}
// Check if this datanode should actually be shutdown instead.
if (nodeinfo != null && nodeinfo.isDisallowed()) {
setDatanodeDead(nodeinfo);
throw new DisallowedDatanodeException(nodeinfo);
}
if (nodeinfo == null || !nodeinfo.isAlive) {
return new DatanodeCommand[]{DatanodeCommand.REGISTER};
}
updateStats(nodeinfo, false);
nodeinfo.updateHeartbeat(capacity, dfsUsed, remaining, namespaceUsed, xceiverCount);
updateStats(nodeinfo, true);
//check lease recovery
cmd = nodeinfo.getLeaseRecoveryCommand(Integer.MAX_VALUE);
if (cmd != null) {
return new DatanodeCommand[]{cmd};
}
ArrayList<DatanodeCommand> cmds = new ArrayList<DatanodeCommand>(2);
//check pending replication
cmd = nodeinfo.getReplicationCommand(maxReplicationStreams -
xmitsInProgress);
if (cmd != null) {
cmds.add(cmd);
}
//check block invalidation
cmd = nodeinfo.getInvalidateBlocks(blockInvalidateLimit);
if (cmd != null) {
cmds.add(cmd);
}
if (!cmds.isEmpty()) {
return cmds.toArray(new DatanodeCommand[cmds.size()]);
}
}
}
//check distributed upgrade
cmd = getDistributedUpgradeCommand();
if (cmd != null) {
return new DatanodeCommand[]{cmd};
}
return null;
}
void handleKeepAlive(DatanodeRegistration nodeReg) throws IOException {
synchronized (heartbeats) {
synchronized (datanodeMap) {
DatanodeDescriptor nodeinfo = null;
try {
nodeinfo = getDatanode(nodeReg);
} catch (UnregisteredDatanodeException e) {
return;
}
if (nodeinfo == null || !nodeinfo.isAlive) {
return;
}
nodeinfo.updateLastHeard();
}
}
}
private void updateStats(DatanodeDescriptor node, boolean isAdded) {
//
// The statistics are protected by the heartbeat lock
// For decommissioning/decommissioned nodes, only used capacity
// is counted.
//
assert (Thread.holdsLock(heartbeats));
if (isAdded) {
capacityUsed += node.getDfsUsed();
capacityNamespaceUsed += node.getNamespaceUsed();
totalLoad += node.getXceiverCount();
if (!(node.isDecommissionInProgress() || node.isDecommissioned())) {
capacityTotal += node.getCapacity();
capacityRemaining += node.getRemaining();
} else {
capacityTotal += node.getDfsUsed();
}
} else {
capacityUsed -= node.getDfsUsed();
capacityNamespaceUsed -= node.getNamespaceUsed();
totalLoad -= node.getXceiverCount();
if (!(node.isDecommissionInProgress() || node.isDecommissioned())) {
capacityTotal -= node.getCapacity();
capacityRemaining -= node.getRemaining();
} else {
capacityTotal -= node.getDfsUsed();
}
}
}
/**
* Periodically calls heartbeatCheck().
*/
class HeartbeatMonitor implements Runnable {
/**
*/
public void run() {
while (fsRunning) {
try {
heartbeatCheck();
} catch (Exception e) {
FSNamesystem.LOG.error("Error in heartbeatCheck: ", e);
}
try {
Thread.sleep(heartbeatRecheckInterval);
} catch (InterruptedException ie) {
}
}
}
}
/**
* Periodically calls computeDatanodeWork().
*/
class UnderReplicationMonitor implements Runnable {
static final int INVALIDATE_WORK_PCT_PER_ITERATION = 32;
static final float REPLICATION_WORK_MULTIPLIER_PER_ITERATION = 2;
public void run() {
while (fsRunning) {
try {
computeDatanodeWork();
processPendingReplications();
Thread.sleep(underReplicationRecheckInterval);
} catch (InterruptedException ie) {
LOG.warn("UnderReplicationMonitor thread received InterruptedException." + ie);
break;
} catch (IOException ie) {
LOG.warn("UnderReplicationMonitor thread received exception. " + ie);
} catch (Throwable t) {
LOG.warn("UnderReplicationMonitor thread received Runtime exception. " + t);
Runtime.getRuntime().exit(-1);
}
}
}
}
/**
* Periodically calls processOverReplicatedBlocksAsync().
*/
class OverReplicationMonitor implements Runnable {
public void run() {
while (fsRunning) {
try {
processOverReplicatedBlocksAsync();
configManager.reloadConfigIfNecessary();
Thread.sleep(overReplicationRecheckInterval);
} catch (InterruptedException ie) {
LOG.warn("OverReplicationMonitor thread received InterruptedException." + ie);
break;
} catch (Throwable t) {
LOG.warn("OverReplicationMonitor thread received Runtime exception. " + t);
Runtime.getRuntime().exit(-1);
}
}
}
}
/////////////////////////////////////////////////////////
//
// These methods are called by the Namenode system, to see
// if there is any work for registered datanodes.
//
/////////////////////////////////////////////////////////
/**
* Compute block replication and block invalidation work
* that can be scheduled on data-nodes.
* The datanode will be informed of this work at the next heartbeat.
*
* @return number of blocks scheduled for replication or removal.
*/
public int computeDatanodeWork() throws IOException {
int workFound = 0;
int blocksToProcess = 0;
int nodesToProcess = 0;
// blocks should not be replicated or removed if safe mode is on
if (isInSafeMode()) {
return workFound;
}
synchronized (heartbeats) {
blocksToProcess = (int) (heartbeats.size()
* this.replicationWorkMultiplier);
nodesToProcess = (int) Math.ceil((double) heartbeats.size()
* UnderReplicationMonitor.INVALIDATE_WORK_PCT_PER_ITERATION / 100);
}
workFound = computeReplicationWork(blocksToProcess);
// Update FSNamesystemMetrics counters
writeLock();
try {
pendingReplicationBlocksCount = pendingReplications.size();
underReplicatedBlocksCount = neededReplications.size();
scheduledReplicationBlocksCount = workFound;
corruptReplicaBlocksCount = corruptReplicas.size();
} finally {
writeUnlock();
}
workFound += computeInvalidateWork(nodesToProcess);
return workFound;
}
/**
* Schedule blocks for deletion at datanodes
*
* @param nodesToProcess number of datanodes to schedule deletion work
* @return total number of block for deletion
*/
int computeInvalidateWork(int nodesToProcess) {
int numOfNodes = 0;
ArrayList<String> keyArray = null;
readLock();
try {
numOfNodes = recentInvalidateSets.size();
// get an array of the keys
keyArray = new ArrayList<String>(recentInvalidateSets.keySet());
} finally {
readUnlock();
}
nodesToProcess = Math.min(numOfNodes, nodesToProcess);
// randomly pick up <i>nodesToProcess</i> nodes
// and put them at [0, nodesToProcess)
int remainingNodes = numOfNodes - nodesToProcess;
if (nodesToProcess < remainingNodes) {
for (int i = 0; i < nodesToProcess; i++) {
int keyIndex = r.nextInt(numOfNodes - i) + i;
Collections.swap(keyArray, keyIndex, i); // swap to front
}
} else {
for (int i = 0; i < remainingNodes; i++) {
int keyIndex = r.nextInt(numOfNodes - i);
Collections.swap(keyArray, keyIndex, numOfNodes - i - 1); // swap to end
}
}
int blockCnt = 0;
for (int nodeCnt = 0; nodeCnt < nodesToProcess; nodeCnt++) {
blockCnt += invalidateWorkForOneNode(keyArray.get(nodeCnt));
}
return blockCnt;
}
/**
* Scan blocks in {@link #neededReplications} and assign replication
* work to data-nodes they belong to.
* <p/>
* The number of process blocks equals either twice the number of live
* data-nodes or the number of under-replicated blocks whichever is less.
*
* @return number of blocks scheduled for replication during this iteration.
*/
private int computeReplicationWork(
int blocksToProcess) throws IOException {
// stall only useful for unit tests (see TestFileAppend4.java)
if (stallReplicationWork) {
return 0;
}
// Choose the blocks to be replicated
List<List<Block>> blocksToReplicate =
chooseUnderReplicatedBlocks(blocksToProcess);
// replicate blocks
return computeReplicationWorkForBlocks(blocksToReplicate);
}
/** Decide the number of blocks to replicate on for this priority.
* The heuristic is that allocate at most 20% the quota for
* lower priority blocks
*
* @param totalQuota max number of blocks can be replicated
* @param blocksForThisPriority
* number of needed replication blocks for this priority
* @param blocksForLowerPriorities
* number of lower priority needed replication blocks
* @return the number blocks
*/
private int getQuotaForThisPriority(int totalQuota, int blocksForThisPriority,
int blocksForLowerPriorities) {
// reserve at most 20% for lower priority blocks
int quotaForLowerPriorities =
Math.min(totalQuota/5, blocksForLowerPriorities);
return Math.min( blocksForThisPriority,
totalQuota-quotaForLowerPriorities);
}
/**
* Get a list of block lists to be replicated
* The index of block lists represents the
*
* @param blocksToProcess
* @return Return a list of block lists to be replicated.
* The block list index represents its replication priority.
*/
List<List<Block>> chooseUnderReplicatedBlocks(int blocksToProcess) {
// initialize data structure for the return value
List<List<Block>> blocksToReplicate =
new ArrayList<List<Block>>(UnderReplicatedBlocks.LEVEL);
for (int i = 0; i < UnderReplicatedBlocks.LEVEL; i++) {
blocksToReplicate.add(new ArrayList<Block>());
}
writeLock();
try {
synchronized (neededReplications) {
if (neededReplications.size() == 0) {
return blocksToReplicate;
}
for (int priority = 0; priority<UnderReplicatedBlocks.LEVEL; priority++) {
// Go through all blocks that need replications of priority
BlockIterator neededReplicationsIterator = neededReplications.iterator(priority);
int numBlocks = neededReplications.size(priority);
if (replIndex[priority] > numBlocks) {
replIndex[priority] = 0;
}
// skip to the first unprocessed block, which is at replIndex
for (int i = 0; i < replIndex[priority] && neededReplicationsIterator.hasNext(); i++) {
neededReplicationsIterator.next();
}
// # of blocks to process for this priority
int blocksToProcessIter = getQuotaForThisPriority(blocksToProcess,
numBlocks, neededReplications.getSize(priority+1));
blocksToProcess -= blocksToProcessIter;
for (int blkCnt = 0; blkCnt < blocksToProcessIter; blkCnt++, replIndex[priority]++) {
if (!neededReplicationsIterator.hasNext()) {
// start from the beginning
replIndex[priority] = 0;
neededReplicationsIterator = neededReplications.iterator(priority);
assert neededReplicationsIterator.hasNext() :
"neededReplications should not be empty.";
}
Block block = neededReplicationsIterator.next();
blocksToReplicate.get(priority).add(block);
} // end for
}
} // end try
return blocksToReplicate;
} finally {
writeUnlock();
}
}
/**
* Replicate a set of blocks
*
* @param blocksToReplicate blocks to be replicated, for each priority
* @return the number of blocks scheduled for replication
*/
int computeReplicationWorkForBlocks(List<List<Block>> blocksToReplicate) {
int requiredReplication, numEffectiveReplicas, priority;
List<DatanodeDescriptor> containingNodes;
DatanodeDescriptor srcNode;
INodeFile fileINode = null;
int scheduledWork = 0;
List<ReplicationWork> work = new LinkedList<ReplicationWork>();
writeLock();
try {
synchronized (neededReplications) {
for (priority = 0; priority < blocksToReplicate.size(); priority++) {
for (Block block : blocksToReplicate.get(priority)) {
// block should belong to a file
fileINode = blocksMap.getINode(block);
// abandoned block not belong to a file
if (fileINode == null ) {
neededReplications.remove(block, priority); // remove from neededReplications
replIndex[priority]--;
continue;
}
requiredReplication = fileINode.getReplication();
// get a source data-node
containingNodes = new ArrayList<DatanodeDescriptor>();
NumberReplicas numReplicas = new NumberReplicas();
srcNode = chooseSourceDatanode(block, containingNodes, numReplicas);
if (srcNode == null) // block can not be replicated from any node
{
continue;
}
// do not schedule more if enough replicas is already pending
numEffectiveReplicas = numReplicas.liveReplicas() +
pendingReplications.getNumReplicas(block);
if (numEffectiveReplicas >= requiredReplication) {
neededReplications.remove(block, priority); // remove from neededReplications
replIndex[priority]--;
continue;
}
work.add(new ReplicationWork(block, fileINode, requiredReplication
- numEffectiveReplicas, srcNode, containingNodes, priority));
}
}
}
} finally {
writeUnlock();
}
// choose replication targets: NOT HODING THE GLOBAL LOCK
for(ReplicationWork rw : work){
DatanodeDescriptor targets[] = chooseTarget(rw);
rw.targets = targets;
}
writeLock();
try {
for(ReplicationWork rw : work){
DatanodeDescriptor[] targets = rw.targets;
if(targets == null || targets.length == 0){
rw.targets = null;
continue;
}
if (targets.length == 1 &&
!clusterMap.isOnSameRack(rw.srcNode, targets[0])) {
// in case src & target are not on the same rack
// see if there is an alternate valid source in the same rack
// as the target that we can use instead.
for (DatanodeDescriptor node : rw.containingNodes) {
if (node != rw.srcNode &&
clusterMap.isOnSameRack(node, targets[0]) &&
isGoodReplica(node, rw.block)) {
rw.srcNode = node;
break;
}
}
}
synchronized (neededReplications) {
Block block = rw.block;
priority = rw.priority;
// Recheck since global lock was released
// block should belong to a file
fileINode = blocksMap.getINode(block);
// abandoned block not belong to a file
if (fileINode == null ) {
neededReplications.remove(block, priority); // remove from neededReplications
rw.targets = null;
replIndex[priority]--;
continue;
}
requiredReplication = fileINode.getReplication();
// do not schedule more if enough replicas is already pending
NumberReplicas numReplicas = countNodes(block);
numEffectiveReplicas = numReplicas.liveReplicas() +
pendingReplications.getNumReplicas(block);
if (numEffectiveReplicas >= requiredReplication) {
neededReplications.remove(block, priority); // remove from neededReplications
replIndex[priority]--;
rw.targets = null;
continue;
}
// Add block to the to be replicated list
rw.srcNode.addBlockToBeReplicated(block, targets);
scheduledWork++;
for (DatanodeDescriptor dn : targets) {
dn.incBlocksScheduled();
}
// Move the block-replication into a "pending" state.
// The reason we use 'pending' is so we can retry
// replications that fail after an appropriate amount of time.
pendingReplications.add(block, targets.length);
if (NameNode.stateChangeLog.isDebugEnabled()) {
NameNode.stateChangeLog.debug(
"BLOCK* block " + block
+ " is moved from neededReplications to pendingReplications");
}
// remove from neededReplications
if (numEffectiveReplicas + targets.length >= requiredReplication) {
neededReplications.remove(block, priority); // remove from neededReplications
replIndex[priority]--;
}
}
}
} finally {
writeUnlock();
}
// update metrics
updateReplicationMetrics(work);
// print debug information
if(NameNode.stateChangeLog.isInfoEnabled()){
// log which blocks have been scheduled for replication
for(ReplicationWork rw : work){
// report scheduled blocks
DatanodeDescriptor[] targets = rw.targets;
if (targets != null && targets.length != 0) {
StringBuffer targetList = new StringBuffer("datanode(s)");
for (int k = 0; k < targets.length; k++) {
targetList.append(' ');
targetList.append(targets[k].getName());
}
NameNode.stateChangeLog.info(
"BLOCK* ask "
+ rw.srcNode.getName() + " to replicate "
+ rw.block + " to " + targetList);
}
}
}
// log once per call
if (NameNode.stateChangeLog.isDebugEnabled()) {
NameNode.stateChangeLog.debug("BLOCK* neededReplications = "
+ neededReplications.size() + " pendingReplications = "
+ pendingReplications.size());
}
return scheduledWork;
}
/**
* Update replication metrics
*
* @param work record for all scheduled replication
*/
private void updateReplicationMetrics(List<ReplicationWork> work) {
for(ReplicationWork rw : work){
DatanodeDescriptor[] targets = rw.targets;
if (targets == null) continue;
for (DatanodeDescriptor target : targets) {
if (clusterMap.isOnSameRack(rw.srcNode, target)) {
myFSMetrics.numLocalRackReplications.inc();
} else {
myFSMetrics.numAcrossRackReplications.inc();
}
}
}
}
/**
* Wrapper function for choosing targets for replication.
*/
private DatanodeDescriptor[] chooseTarget(ReplicationWork work) {
if (!neededReplications.contains(work.block)) {
return null;
}
if (work.blockSize == BlockFlags.NO_ACK) {
LOG.warn("Block " + work.block.getBlockId() +
" of the file " + work.fileINode.getFullPathName() +
" is invalidated and cannot be replicated.");
return null;
}
if (work.blockSize == BlockFlags.DELETED) {
LOG.warn("Block " + work.block.getBlockId() +
" of the file " + work.fileINode.getFullPathName() +
" is a deleted block and cannot be replicated.");
return null;
}
return replicator.chooseTarget(work.fileINode,
work.numOfReplicas, work.srcNode,
work.containingNodes, null, work.blockSize);
}
/**
* Parse the data-nodes the block belongs to and choose one,
* which will be the replication source.
* <p/>
* We prefer nodes that are in DECOMMISSION_INPROGRESS state to other nodes
* since the former do not have write traffic and hence are less busy.
* We do not use already decommissioned nodes as a source.
* Otherwise we choose a random node among those that did not reach their
* replication limit.
* <p/>
* In addition form a list of all nodes containing the block
* and calculate its replication numbers.
*/
private DatanodeDescriptor chooseSourceDatanode(
Block block,
List<DatanodeDescriptor> containingNodes,
NumberReplicas numReplicas) {
containingNodes.clear();
DatanodeDescriptor srcNode = null;
int live = 0;
int decommissioned = 0;
int corrupt = 0;
int excess = 0;
Iterator<DatanodeDescriptor> it = blocksMap.nodeIterator(block);
Collection<DatanodeDescriptor> nodesCorrupt = corruptReplicas.getNodes(block);
DatanodeDescriptor excessReplica = null;
while (it.hasNext()) {
DatanodeDescriptor node = it.next();
Collection<Block> excessBlocks =
excessReplicateMap.get(node.getStorageID());
if ((nodesCorrupt != null) && (nodesCorrupt.contains(node))) {
corrupt++;
} else if (node.isDecommissionInProgress() || node.isDecommissioned()) {
decommissioned++;
} else if (excessBlocks != null && excessBlocks.contains(block)) {
excess++;
} else {
live++;
}
containingNodes.add(node);
// Check if this replica is corrupt
// If so, do not select the node as src node
if ((nodesCorrupt != null) && nodesCorrupt.contains(node)) {
continue;
}
if (node.getNumberOfBlocksToBeReplicated() >= maxReplicationStreams) {
continue;
} // already reached replication limit
// the block must not be scheduled for removal on srcNode
if (excessBlocks != null && excessBlocks.contains(block)) {
excessReplica = node;
continue;
}
// never use already decommissioned nodes
if (node.isDecommissioned()) {
continue;
}
// we prefer nodes that are in DECOMMISSION_INPROGRESS state
if (node.isDecommissionInProgress() || srcNode == null) {
srcNode = node;
continue;
}
if (srcNode.isDecommissionInProgress()) {
continue;
}
// switch to a different node randomly
// this to prevent from deterministically selecting the same node even
// if the node failed to replicate the block on previous iterations
if (r.nextBoolean()) {
srcNode = node;
}
}
if (numReplicas != null) {
numReplicas.initialize(live, decommissioned, corrupt, excess);
}
if (srcNode == null && live == 0 && excessReplica != null) {
// try excessReplica if there is no other choice
srcNode = excessReplica;
}
return srcNode;
}
/**
* Decide if a replica is valid
* @param node datanode the block is located
* @param block a block
* @return true if a replica is valid
*/
private boolean isGoodReplica(DatanodeDescriptor node, Block block) {
Collection<Block> excessBlocks =
excessReplicateMap.get(node.getStorageID());
Collection<DatanodeDescriptor> nodesCorrupt = corruptReplicas.getNodes(block);
return (nodesCorrupt == null || !nodesCorrupt.contains(node)) // not corrupt
// not over scheduling for replication
&& (node.getNumberOfBlocksToBeReplicated() < maxReplicationStreams)
// not alredy scheduled for removal
&& (excessBlocks == null || !excessBlocks.contains(block))
&& !node.isDecommissioned(); // not decommissioned
}
/**
* Get blocks to invalidate for <i>nodeId</i>
* in {@link #recentInvalidateSets}.
*
* @return number of blocks scheduled for removal during this iteration.
*/
private int invalidateWorkForOneNode(String nodeId) {
List<Block> blocksToInvalidate = null;
DatanodeDescriptor dn = null;
writeLock();
try {
// blocks should not be replicated or removed if safe mode is on
if (isInSafeMode()) {
return 0;
}
// get blocks to invalidate for the nodeId
assert nodeId != null;
dn = datanodeMap.get(nodeId);
if (dn == null) {
recentInvalidateSets.remove(nodeId);
return 0;
}
LightWeightHashSet<Block> invalidateSet = recentInvalidateSets
.get(nodeId);
if (invalidateSet == null) {
return 0;
}
// # blocks that can be sent in one message is limited
blocksToInvalidate = invalidateSet.pollN(blockInvalidateLimit);
// If we send everything in this message, remove this node entry
if (invalidateSet.isEmpty()) {
recentInvalidateSets.remove(nodeId);
}
dn.addBlocksToBeInvalidated(blocksToInvalidate);
pendingDeletionBlocksCount -= blocksToInvalidate.size();
} finally {
writeUnlock();
if (NameNode.stateChangeLog.isInfoEnabled() && blocksToInvalidate != null
&& blocksToInvalidate.size() != 0) {
StringBuffer blockList = new StringBuffer();
for (Block blk : blocksToInvalidate) {
blockList.append(' ');
blockList.append(blk);
}
NameNode.stateChangeLog.info("BLOCK* ask "
+ dn.getName() + " to delete " + blockList);
}
}
return blocksToInvalidate.size();
}
public void setNodeReplicationLimit(int limit) {
this.maxReplicationStreams = limit;
}
/**
* If there were any replication requests that timed out, reap them
* and put them back into the neededReplication queue
*/
void processPendingReplications() {
Block[] timedOutItems = pendingReplications.getTimedOutBlocks();
if (timedOutItems != null) {
writeLock();
try {
for (int i = 0; i < timedOutItems.length; i++) {
NumberReplicas num = countNodes(timedOutItems[i]);
neededReplications.add(timedOutItems[i],
num.liveReplicas(),
num.decommissionedReplicas(),
getReplication(timedOutItems[i]));
}
} finally {
writeUnlock();
}
/* If we know the target datanodes where the replication timedout,
* we could invoke decBlocksScheduled() on it. Its ok for now.
*/
}
}
/**
* remove a datanode descriptor
*
* @param nodeID datanode ID
*/
public void removeDatanode(DatanodeID nodeID)
throws IOException {
writeLock();
try {
DatanodeDescriptor nodeInfo = getDatanode(nodeID);
if (nodeInfo != null) {
removeDatanode(nodeInfo);
} else {
NameNode.stateChangeLog.warn("BLOCK* NameSystem.removeDatanode: "
+ nodeID.getName() + " does not exist");
}
} finally {
writeUnlock();
}
}
/**
* remove a datanode descriptor
*
* @param nodeInfo datanode descriptor
*/
private void removeDatanode(DatanodeDescriptor nodeInfo) {
synchronized (heartbeats) {
if (nodeInfo.isAlive) {
updateStats(nodeInfo, false);
heartbeats.remove(nodeInfo);
nodeInfo.isAlive = false;
}
}
for (Iterator<Block> it = nodeInfo.getBlockIterator(); it.hasNext();) {
removeStoredBlock(it.next(), nodeInfo);
}
unprotectedRemoveDatanode(nodeInfo);
clusterMap.remove(nodeInfo);
// remove this datanode from any INodeFileUnderConstruction so
// concurrent readers don't get down datanodes
// (we need a copy of the Set since removeTargets may modify it)
Set<INodeFileUnderConstruction> iNodeFileSet =
new HashSet<INodeFileUnderConstruction>(nodeInfo.getOpenINodes());
for (INodeFileUnderConstruction iNodeFile : iNodeFileSet) {
iNodeFile.removeTarget(nodeInfo);
}
}
void unprotectedRemoveDatanode(DatanodeDescriptor nodeDescr) {
nodeDescr.resetBlocks();
removeFromInvalidates(nodeDescr.getStorageID());
if (NameNode.stateChangeLog.isDebugEnabled()) {
NameNode.stateChangeLog.debug(
"BLOCK* NameSystem.unprotectedRemoveDatanode: "
+ nodeDescr.getName() + " is out of service now.");
}
}
void unprotectedAddDatanode(DatanodeDescriptor nodeDescr) {
/* To keep host2DataNodeMap consistent with datanodeMap,
remove from host2DataNodeMap the datanodeDescriptor removed
from datanodeMap before adding nodeDescr to host2DataNodeMap.
*/
host2DataNodeMap.remove(
datanodeMap.put(nodeDescr.getStorageID(), nodeDescr));
host2DataNodeMap.add(nodeDescr);
if (NameNode.stateChangeLog.isDebugEnabled()) {
NameNode.stateChangeLog.debug(
"BLOCK* NameSystem.unprotectedAddDatanode: "
+ "node " + nodeDescr.getName() + " is added to datanodeMap.");
}
}
/**
* Physically remove node from datanodeMap.
*
* @param nodeID node
*/
void wipeDatanode(DatanodeID nodeID) throws IOException {
String key = nodeID.getStorageID();
host2DataNodeMap.remove(datanodeMap.remove(key));
if (NameNode.stateChangeLog.isDebugEnabled()) {
NameNode.stateChangeLog.debug(
"BLOCK* NameSystem.wipeDatanode: "
+ nodeID.getName() + " storage " + key
+ " is removed from datanodeMap.");
}
}
FSImage getFSImage() {
return dir.fsImage;
}
FSEditLog getEditLog() {
return getFSImage().getEditLog();
}
/**
* Check if there are any expired heartbeats, and if so,
* whether any blocks have to be re-replicated.
* While removing dead datanodes, make sure that only one datanode is marked
* dead at a time within the synchronized section. Otherwise, a cascading
* effect causes more datanodes to be declared dead.
*/
void heartbeatCheck() {
if (isInSafeMode()) {
// not to check dead nodes if in safemode
return;
}
boolean allAlive = false;
while (!allAlive) {
boolean foundDead = false;
DatanodeID nodeID = null;
// locate the first dead node.
synchronized (heartbeats) {
for (Iterator<DatanodeDescriptor> it = heartbeats.iterator();
it.hasNext();) {
DatanodeDescriptor nodeInfo = it.next();
if (isDatanodeDead(nodeInfo)) {
foundDead = true;
nodeID = nodeInfo;
break;
}
}
}
// acquire the fsnamesystem lock, and then remove the dead node.
if (foundDead) {
writeLock();
try {
synchronized (heartbeats) {
synchronized (datanodeMap) {
DatanodeDescriptor nodeInfo = null;
try {
nodeInfo = getDatanode(nodeID);
} catch (IOException e) {
nodeInfo = null;
}
if (nodeInfo != null && isDatanodeDead(nodeInfo)) {
NameNode.stateChangeLog.info("BLOCK* NameSystem.heartbeatCheck: "
+ "lost heartbeat from " + nodeInfo.getName());
removeDatanode(nodeInfo);
nodeInfo.setStartTime(now());
}
}
}
} finally {
writeUnlock();
}
}
allAlive = !foundDead;
}
}
public void processBlocksBeingWrittenReport(DatanodeID nodeID,
BlockListAsLongs blocksBeingWritten)
throws IOException {
writeLock();
try {
DatanodeDescriptor dataNode = getDatanode(nodeID);
if (dataNode == null) {
throw new IOException("ProcessReport from unregisterted node: "
+ nodeID.getName());
}
Block block = new Block();
for (int i = 0; i < blocksBeingWritten.getNumberOfBlocks(); i ++) {
block.set(blocksBeingWritten.getBlockId(i),
blocksBeingWritten.getBlockLen(i),
blocksBeingWritten.getBlockGenStamp(i));
BlockInfo storedBlock = blocksMap.getStoredBlockWithoutMatchingGS(block);
if (storedBlock == null) {
rejectAddStoredBlock(
new Block(block), dataNode,
"Block not in blockMap with any generation stamp",
true);
continue;
}
INodeFile inode = storedBlock.getINode();
if (inode == null) {
rejectAddStoredBlock(
new Block(block), dataNode,
"Block does not correspond to any file",
true);
continue;
}
boolean underConstruction = inode.isUnderConstruction();
boolean isLastBlock = inode.getLastBlock() != null &&
inode.getLastBlock().getBlockId() == block.getBlockId();
// Must be the last block of a file under construction,
if (!underConstruction) {
rejectAddStoredBlock(
new Block(block), dataNode,
"Reported as block being written but is a block of closed file.",
true);
continue;
}
if (!isLastBlock) {
rejectAddStoredBlock(
new Block(block), dataNode,
"Reported as block being written but not the last block of " +
"an under-construction file.",
true);
continue;
}
INodeFileUnderConstruction pendingFile =
(INodeFileUnderConstruction)inode;
boolean added = pendingFile.addTarget(dataNode);
if (!dataNode.isDecommissioned()
&& !dataNode.isDecommissionInProgress() && added) {
// Increment only once for each datanode.
incrementSafeBlockCount(pendingFile.getTargets().length, true);
}
}
} finally {
checkSafeMode();
writeUnlock();
}
}
/**
* The given node is reporting all its blocks. Use this info to
* update the (machine-->blocklist) and (block-->machinelist) tables.
*/
public Collection<Block> processReport(DatanodeID nodeID,
BlockListAsLongs newReport
) throws IOException {
// To minimize startup time, we discard any second (or later) block reports
// that we receive while still in startup phase.
// Checking this without holding fsnamesystem so that duplicate
// block reports won't wait for too long time thus getting into old gen
if (isInStartupSafeMode()) {
synchronized (datanodeMap) {
DatanodeDescriptor node = getDatanode(nodeID);
if (node != null && node.numBlocks() != 0 ) {
NameNode.stateChangeLog.info("BLOCK* NameSystem.processReport: "
+ "discarded non-initial block report from " + nodeID.getName()
+ " because namenode still in startup phase");
return new LinkedList<Block>();
}
}
}
int processTime;
Collection<Block> toAdd = null, toRemove = null, toInvalidate = null, toRetry = null;
boolean firstReport = false;
writeLock();
try {
long startTime = now();
if (NameNode.stateChangeLog.isDebugEnabled()) {
NameNode.stateChangeLog.debug("BLOCK* NameSystem.processReport: "
+ "from " + nodeID.getName() + " " +
newReport.getNumberOfBlocks() + " blocks");
}
DatanodeDescriptor node = getDatanode(nodeID);
if (node == null || !node.isAlive) {
throw new IOException("ProcessReport from dead or unregistered node: "
+ nodeID.getName());
}
if (this.getNameNode().shouldRetryAbsentBlocks()) {
toRetry = new LinkedList<Block>();
}
// check the case when the NN does not know of any replicas on this
// datanode. This typically happens when the NN restarts and the first
// report from this datanode is being processed. Short-circuit the
// processing in this case: just add all these replicas to this
// datanode. This helps NN restart times tremendously.
firstReport = node.numBlocks() == 0;
if (firstReport) {
Block iblk = new Block(); // a fixed new'ed block to be reused with index i
for (int i = 0; i < newReport.getNumberOfBlocks(); ++i) {
iblk.set(newReport.getBlockId(i), newReport.getBlockLen(i),
newReport.getBlockGenStamp(i));
if (!addStoredBlockInternal(iblk, node, null, true)
&& this.getNameNode().shouldRetryAbsentBlock(iblk)) {
toRetry.add(new Block(iblk));
}
}
dnReporting++;
} else {
//
// Modify the (block-->datanode) map, according to the difference
// between the old and new block report.
//
toAdd = new LinkedList<Block>();
toRemove = new LinkedList<Block>();
toInvalidate = new LinkedList<Block>();
node.reportDiff(blocksMap, newReport, toAdd, toRemove, toInvalidate,
toRetry, this);
for (Block b : toRemove) {
removeStoredBlock(b, node);
}
for (Block b : toAdd) {
addStoredBlock(b, node, null);
}
for (Block b : toInvalidate) {
addToInvalidatesNoLog(b, node, false);
}
}
processTime = (int)(now() - startTime);
NameNode.getNameNodeMetrics().blockReport.inc(processTime);
} finally {
checkSafeMode();
writeUnlock();
}
if (toInvalidate != null) {
for (Block b : toInvalidate) {
NameNode.stateChangeLog.info("BLOCK* NameSystem.processReport: block "
+ b + " on " + nodeID.getName() + " size " + b.getNumBytes()
+ " does not belong to any file.");
}
}
String shortCircuit = firstReport ? " (shortCircuit first report)" : "";
NameNode.stateChangeLog.info("BLOCK* NameSystem.processReport"+ shortCircuit
+ ": from " + nodeID.getName() + " with " + newReport.getNumberOfBlocks()
+ " blocks took " + processTime + "ms"
+ (toAdd == null ? "." : (": #toAdd = " + toAdd.size() +
" #toRemove = " + toRemove.size() +
" #toInvalidate = " + toInvalidate.size() +
".")));
if(firstReport && isInSafeMode()) {
LOG.info("BLOCK* NameSystem.processReport: " + dnReporting +
" data nodes reporting, " +
getSafeBlocks() + "/" + getBlocksTotal() +
" blocks safe (" + getSafeBlockRatio() + ")");
}
return toRetry;
}
/**
* Return true if the block size number is valid
*/
private boolean checkBlockSize(Block block, INodeFile inode) {
if (block.getNumBytes() < 0) {
return false;
}
BlockInfo[] blocks = inode.getBlocks();
if (blocks.length == 0) {
return false;
}
return block.getNumBytes() <= inode.getPreferredBlockSize();
}
/**
* Modify (block-->datanode) map. Remove block from set of needed replications
* if this takes care of the problem.
*
* @return whether or not the block was stored.
*/
private boolean addStoredBlock(Block block,
DatanodeDescriptor node,
DatanodeDescriptor delNodeHint) {
return addStoredBlockInternal(block, node, delNodeHint, false);
}
/**
* Modify (block-->datanode) map. Remove block from set of
* needed replications if this takes care of the problem.
*
* @return the block that is stored in blockMap.
*/
private boolean addStoredBlockInternal(Block block,
DatanodeDescriptor node,
DatanodeDescriptor delNodeHint,
boolean initialBlockReport) {
assert (hasWriteLock());
BlockInfo storedBlock = blocksMap.getStoredBlock(block);
if (storedBlock == null) {
// then we need to do some special processing.
storedBlock = blocksMap.getStoredBlockWithoutMatchingGS(block);
if (storedBlock == null) {
rejectAddStoredBlock(
new Block(block), node,
"Block not in blockMap with any generation stamp",
initialBlockReport);
return false;
}
INodeFile inode = storedBlock.getINode();
if (inode == null) {
rejectAddStoredBlock(
new Block(block), node,
"Block does not correspond to any file",
initialBlockReport);
return false;
}
boolean reportedOldGS = block.getGenerationStamp() < storedBlock.getGenerationStamp();
boolean reportedNewGS = block.getGenerationStamp() > storedBlock.getGenerationStamp();
boolean underConstruction = inode.isUnderConstruction();
boolean isLastBlock = inode.getLastBlock() != null &&
inode.getLastBlock().getBlockId() == block.getBlockId();
// We can report a stale generation stamp for the last block under construction,
// we just need to make sure it ends up in targets.
if (reportedOldGS && !(underConstruction && isLastBlock)) {
rejectAddStoredBlock(
new Block(block), node,
"Reported block has old generation stamp but is not the last block of " +
"an under-construction file. (current generation is " +
storedBlock.getGenerationStamp() + ")",
initialBlockReport);
return false;
}
// Don't add blocks to the DN when they're part of the in-progress last block
// and have an inconsistent generation stamp. Instead just add them to targets
// for recovery purposes. They will get added to the node when
// commitBlockSynchronization runs
if (underConstruction && isLastBlock && (reportedOldGS || reportedNewGS)) {
NameNode.stateChangeLog.info(
"BLOCK* NameSystem.addStoredBlock: "
+ "Targets updated: block " + block + " on " + node.getName() +
" is added as a target for block " + storedBlock + " with size " +
block.getNumBytes());
((INodeFileUnderConstruction)inode).addTarget(node);
return false;
}
}
INodeFile fileINode = storedBlock.getINode();
if (fileINode == null) {
rejectAddStoredBlock(
new Block(block), node,
"Block does not correspond to any file",
initialBlockReport);
return false;
}
assert storedBlock != null : "Block must be stored by now";
// add block to the data-node
boolean added = node.addBlock(storedBlock);
// Is the block being reported the last block of an underconstruction file?
boolean blockUnderConstruction = false;
if (fileINode.isUnderConstruction()) {
Block last = fileINode.getLastBlock();
if (last == null) {
// This should never happen, but better to handle it properly than to throw
// an NPE below.
LOG.error("Null blocks for reported block=" + block + " stored=" + storedBlock +
" inode=" + fileINode);
return false;
}
blockUnderConstruction = last.equals(storedBlock);
}
// block == storedBlock when this addStoredBlock is the result of a block report
if (block.getNumBytes() != storedBlock.getNumBytes()) {
if (!checkBlockSize(block, storedBlock.getINode())) {
try {
// New replica has an invalid block size. Mark it as corrupted.
LOG.warn("Mark new replica " + block + " from " + node.getName() +
"as corrupt because its length " + block.getNumBytes() +
" is not valid");
markBlockAsCorrupt(block, node);
} catch (IOException e) {
LOG.warn("Error in deleting bad block " + block + e);
}
} else {
long cursize = storedBlock.getNumBytes();
INodeFile file = storedBlock.getINode();
if (cursize == 0) {
storedBlock.setNumBytes(block.getNumBytes());
} else if (cursize != block.getNumBytes()) {
String logMsg = "Inconsistent size for block " + block +
" reported from " + node.getName() +
" current size is " + cursize +
" reported size is " + block.getNumBytes();
// If the block is still under construction this isn't likely
// to be a problem, so just log at INFO level.
if (blockUnderConstruction) {
if (cursize != 1) { // cursize == 1 implies block was fsynced
LOG.info(logMsg);
}
} else {
LOG.warn(logMsg);
}
try {
if (cursize > block.getNumBytes() && !blockUnderConstruction) {
// new replica is smaller in size than existing block.
// Mark the new replica as corrupt.
LOG.warn("Mark new replica " + block + " from " + node.getName() +
"as corrupt because its length is shorter than existing ones");
markBlockAsCorrupt(block, node);
} else {
// new replica is larger in size than existing block.
if (!blockUnderConstruction) {
// Mark pre-existing replicas as corrupt.
int numNodes = blocksMap.numNodes(block);
int count = 0;
DatanodeDescriptor nodes[] = new DatanodeDescriptor[numNodes];
Iterator<DatanodeDescriptor> it = blocksMap.nodeIterator(block);
for (; it != null && it.hasNext(); ) {
DatanodeDescriptor dd = it.next();
if (!dd.equals(node)) {
nodes[count++] = dd;
}
}
for (int j = 0; j < count; j++) {
LOG.warn("Mark existing replica " + block + " from " + node.getName() +
" as corrupt because its length is shorter than the new one");
markBlockAsCorrupt(block, nodes[j]);
}
}
//
// change the size of block in blocksMap
//
storedBlock.setNumBytes(block.getNumBytes());
}
} catch (IOException e) {
LOG.warn("Error in deleting bad block " + block + e);
}
}
}
block = storedBlock;
} else {
block = storedBlock;
}
assert storedBlock == block : "Block must be stored by now";
int curReplicaDelta = 0;
if (added) {
curReplicaDelta = 1;
} else {
NameNode.stateChangeLog.info("BLOCK* NameSystem.addStoredBlock: "
+ "Redundant addStoredBlock request received for "
+ block + " on " + node.getName()
+ " size " + block.getNumBytes());
}
// filter out containingNodes that are marked for decommission.
NumberReplicas num = null;
int numCurrentReplica = 0;
int numLiveReplicas = 0;
boolean popReplQueuesBefore = isPopulatingReplQueues();
if (!popReplQueuesBefore) {
// if we haven't populated the replication queues
// then use a cheaper method to count
// only live replicas, that's all we need.
numLiveReplicas = countLiveNodes(storedBlock);
numCurrentReplica = numLiveReplicas;
} else {
// count live & decommissioned replicas
num = countNodes(storedBlock);
numLiveReplicas = num.liveReplicas();
numCurrentReplica = numLiveReplicas + pendingReplications.getNumReplicas(block);
}
// check whether safe replication is reached for the block. Do not increment
// safe block count if this block has already been reported by the same
// datanode before. We used the check for 'added' to achieve this.
if (!node.isDecommissionInProgress() && !node.isDecommissioned() && added) {
incrementSafeBlockCount(numCurrentReplica, initialBlockReport);
}
if (!popReplQueuesBefore && isPopulatingReplQueues()) {
// we have just initialized the repl queues
// must recompute num
num = countNodes(storedBlock);
numLiveReplicas = num.liveReplicas();
numCurrentReplica = numLiveReplicas +
pendingReplications.getNumReplicas(block);
}
//
// if file is being actively written to and it is the last block,
// then do not check replication-factor here.
//
if (blockUnderConstruction && fileINode.isLastBlock(storedBlock)) {
INodeFileUnderConstruction cons = (INodeFileUnderConstruction)fileINode;
cons.addTarget(node);
return true;
}
// do not handle mis-replicated blocks during start up
if (!isPopulatingReplQueues()) {
return true;
}
if (curReplicaDelta == 0) {
return true;
}
// handle underReplication
short fileReplication = fileINode.getReplication();
updateNeededReplicationQueue(block, curReplicaDelta, numCurrentReplica,
num.decommissionedReplicas, node, fileReplication);
// handle over-replication
if (numCurrentReplica > fileReplication) {
processOverReplicatedBlock(block, fileReplication, node, delNodeHint);
}
// If the file replication has reached desired value
// we can remove any corrupt replicas the block may have
int corruptReplicasCount = corruptReplicas.numCorruptReplicas(block);
int numCorruptNodes = num.corruptReplicas();
if (numCorruptNodes != corruptReplicasCount) {
LOG.warn("Inconsistent number of corrupt replicas for " +
block + "blockMap has " + numCorruptNodes +
" but corrupt replicas map has " + corruptReplicasCount);
}
if ((corruptReplicasCount > 0) && (numLiveReplicas >= fileReplication)) {
invalidateCorruptReplicas(block);
}
return true;
}
/**
* Log a rejection of an addStoredBlock RPC, invalidate the reported block
*/
private void rejectAddStoredBlock(Block block,
DatanodeDescriptor node,
String msg,
boolean ignoreInfoLogs) {
if ((!isInSafeMode()) && (!ignoreInfoLogs)) {
NameNode.stateChangeLog.info("BLOCK* NameSystem.addStoredBlock: "
+ "addStoredBlock request received for "
+ block + " size " + block.getNumBytes()
+ " but was rejected and added to invalidSet of "
+ node.getName() + " : " + msg);
}
addToInvalidatesNoLog(block, node, false);
}
/**
* Invalidate corrupt replicas.
* <p/>
* This will remove the replicas from the block's location list,
* add them to {@link #recentInvalidateSets} so that they could be further
* deleted from the respective data-nodes,
* and remove the block from corruptReplicasMap.
* <p/>
* This method should be called when the block has sufficient
* number of live replicas.
*
* @param blk Block whose corrupt replicas need to be invalidated
*/
void invalidateCorruptReplicas(Block blk) {
Collection<DatanodeDescriptor> nodes = corruptReplicas.getNodes(blk);
boolean gotException = false;
if (nodes == null) {
return;
}
// Make a copy of this list, since calling invalidateBlock will modify
// the original (avoid CME)
nodes = new ArrayList<DatanodeDescriptor>(nodes);
if (NameNode.stateChangeLog.isDebugEnabled()) {
NameNode.stateChangeLog.debug("NameNode.invalidateCorruptReplicas: " +
"invalidating corrupt replicas on " + nodes.size() + "nodes");
}
for (Iterator<DatanodeDescriptor> it = nodes.iterator(); it.hasNext();) {
DatanodeDescriptor node = it.next();
try {
invalidateBlock(blk, node, true);
} catch (IOException e) {
NameNode.stateChangeLog.info("NameNode.invalidateCorruptReplicas " +
"error in deleting bad block " + blk +
" on " + node + e);
gotException = true;
}
}
// Remove the block from corruptReplicasMap
if (!gotException) {
corruptReplicas.removeFromCorruptReplicasMap(blk);
}
}
/**
* For each block in the name-node verify whether it belongs to any file,
* over or under replicated. Place it into the respective queue.
*/
protected void processMisReplicatedBlocks() {
writeLock();
try {
String logPrefix = "Processing mis-replicated blocks: ";
long nrInvalid = 0, nrOverReplicated = 0, nrUnderReplicated = 0;
neededReplications.clear();
int totalBlocks = blocksMap.size();
long currentBlock = 0;
LOG.info(logPrefix + "Starting");
for (BlocksMap.BlockInfo block : blocksMap.getBlocks()) {
currentBlock++;
if ((currentBlock % 1000000) == 0) {
LOG.info(logPrefix + "Percent completed: " +
(currentBlock * 100 / totalBlocks) );
}
INodeFile fileINode = block.getINode();
if (fileINode == null) {
// block does not belong to any file
nrInvalid++;
addToInvalidates(block, false);
continue;
}
// If this is a last block of a file under construction ignore it.
if (block.equals(fileINode.getLastBlock())
&& fileINode.isUnderConstruction()) {
continue;
}
// calculate current replication
short expectedReplication = fileINode.getReplication();
NumberReplicas num = countNodes(block);
int numCurrentReplica = num.liveReplicas();
// add to under-replicated queue if need to be
if (neededReplications.add(block,
numCurrentReplica,
num.decommissionedReplicas(),
expectedReplication)) {
nrUnderReplicated++;
}
if (numCurrentReplica > expectedReplication) {
// over-replicated block
nrOverReplicated++;
overReplicatedBlocks.add(block);
}
}
LOG.info(logPrefix + "Total number of blocks = " + blocksMap.size());
LOG.info(logPrefix + "Number of invalid blocks = " + nrInvalid);
LOG.info(logPrefix + "Number of under-replicated blocks = " +
nrUnderReplicated);
LOG.info(logPrefix + "Number of over-replicated blocks = " +
nrOverReplicated);
LOG.info(logPrefix + "Finished");
} finally {
writeUnlock();
}
}
/**
* This is called from the ReplicationMonitor to process over
* replicated blocks.
*/
private void processOverReplicatedBlocksAsync() {
List<Block> blocksToProcess = new LinkedList<Block>();
writeLock();
try {
int size = Math.min(overReplicatedBlocks.size(), 1000);
NameNode.getNameNodeMetrics().numOverReplicatedBlocks.set(overReplicatedBlocks.size());
blocksToProcess = overReplicatedBlocks.pollN(size);
} finally {
writeUnlock();
}
for (Block block : blocksToProcess) {
if (NameNode.stateChangeLog.isDebugEnabled()) {
NameNode.stateChangeLog
.debug("BLOCK* NameSystem.processOverReplicatedBlocksAsync: " + block);
}
processOverReplicatedBlock(block, (short) -1, null, null);
}
}
/**
* Find how many of the containing nodes are "extra", if any.
* If there are any extras, call findOverReplicatedReplicas() to
* insert them into excessReplicateTmp.
*/
private void processOverReplicatedBlock(Block block, short replication,
DatanodeDescriptor addedNode, DatanodeDescriptor delNodeHint) {
List<DatanodeID> excessReplicateTmp = new ArrayList<DatanodeID>();
List<DatanodeID> originalDatanodes = new ArrayList<DatanodeID>();
// find all replicas that can possibly be deleted.
// The results are returned in excessReplicateTmp.
findOverReplicatedReplicas(block, replication,
addedNode, delNodeHint,
excessReplicateTmp, originalDatanodes);
if (excessReplicateTmp.size() <= 0) {
return;
}
writeLock(); // acquire write lock,
try {
INodeFile inode = blocksMap.getINode(block);
if (inode == null) {
return; // file has been deleted already, nothing to do.
}
//
// if the state of replicas of this block has changed since the time
// when we released and reacquired the lock, then all the decisions
// that we have made so far might not be correct. Do not delete excess
// replicas in this case.
int live = 0;
Collection<DatanodeDescriptor> nodesCorrupt = corruptReplicas.getNodes(block);
for (Iterator<DatanodeDescriptor> it = blocksMap.nodeIterator(block);
it.hasNext();) {
DatanodeDescriptor node = it.next();
if (((nodesCorrupt != null) && (nodesCorrupt.contains(node))) ||
node.isDecommissionInProgress() || node.isDecommissioned()) {
// do nothing
} else {
live++; // number of live nodes
originalDatanodes.remove(node);
}
}
if (originalDatanodes.size() > 0) {
NameNode.stateChangeLog.info("Unable to delete excess replicas for block " +
block +
" because the state of the original replicas have changed." +
" Will retry later.");
overReplicatedBlocks.add(block);
return;
}
// loop through datanodes that have excess-replicas of this block
for (ListIterator<DatanodeID> iter = excessReplicateTmp.listIterator();
iter.hasNext();) {
DatanodeID datanodeId = iter.next();
// re-check that block still has excess replicas.
// If not, then there is nothing more to do.
if (live <= inode.getReplication()) {
break;
}
// find the DatanodeDescriptor for this datanode
DatanodeDescriptor datanode = null;
try {
datanode = getDatanode(datanodeId);
} catch (IOException e) {
}
if (datanode == null) {
NameNode.stateChangeLog.info("No datanode found while processing " +
"overreplicated block " + block);
continue; // dead datanode?
}
// insert into excessReplicateMap
Collection<Block> excessBlocks = excessReplicateMap.get(datanodeId.getStorageID());
if (excessBlocks == null) {
excessBlocks = new TreeSet<Block>();
excessReplicateMap.put(datanodeId.getStorageID(), excessBlocks);
}
if (excessBlocks.add(block)) {
excessBlocksCount++;
if (NameNode.stateChangeLog.isDebugEnabled()) {
NameNode.stateChangeLog.debug("BLOCK* NameSystem.chooseExcessReplicates: "
+ "(" + datanodeId.getName() + ", " + block
+ ") is added to excessReplicateMap");
}
}
//
// The 'excessblocks' tracks blocks until we get confirmation
// that the datanode has deleted them; the only way we remove them
// is when we get a "removeBlock" message.
//
// The 'invalidate' list is used to inform the datanode the block
// should be deleted. Items are removed from the invalidate list
// upon giving instructions to the namenode.
//
addToInvalidatesNoLog(block, datanode, true);
live--;
if (NameNode.stateChangeLog.isDebugEnabled()) {
NameNode.stateChangeLog.debug("BLOCK* NameSystem.chooseExcessReplicates: "
+ "(" + datanode.getName() + ", " + block + ") is added to recentInvalidateSets");
}
}
} finally {
writeUnlock();
}
}
/**
* Find how many of the containing nodes are "extra", if any.
* If there are any extras, call chooseExcessReplicates() to
* mark them in the excessReplicateMap.
*
* @param excessReplicateMapTmp replicas that can possibly be in excess
* @param originalDatanodes all currently valid replicas of this block
*/
private void findOverReplicatedReplicas(Block block, short replication,
DatanodeDescriptor addedNode, DatanodeDescriptor delNodeHint,
List<DatanodeID> excessReplicateMapTmp,
List<DatanodeID> originalDatanodes) {
Collection<DatanodeDescriptor> nonExcess;
INodeFile inode;
readLock();
try {
inode = blocksMap.getINode(block);
if (inode == null) {
return; // file has been deleted already, nothing to do.
}
// if the caller did not specify what the target replication factor
// of the file, then fetch it from the inode. This happens when invoked
// by the ReplicationMonitor thread.
if (replication < 0) {
replication = inode.getReplication();
}
if (addedNode == delNodeHint) {
delNodeHint = null;
}
nonExcess = new ArrayList<DatanodeDescriptor>();
Collection<DatanodeDescriptor> corruptNodes = corruptReplicas.getNodes(block);
for (Iterator<DatanodeDescriptor> it = blocksMap.nodeIterator(block);
it.hasNext();) {
DatanodeDescriptor cur = it.next();
Collection<Block> excessBlocks = excessReplicateMap.get(cur.getStorageID());
if (excessBlocks == null || !excessBlocks.contains(block)) {
if (!cur.isDecommissionInProgress() && !cur.isDecommissioned()) {
// exclude corrupt replicas
if (corruptNodes == null || !corruptNodes.contains(cur)) {
nonExcess.add(cur);
originalDatanodes.add(cur);
}
}
}
}
} finally {
readUnlock();
}
// this can be called without the FSnamesystem lock because it does not
// use any global data structures. Also, the inode is passed as it is to
// the Pluggable blockplacement policy.
chooseExcessReplicates(nonExcess, block, replication,
addedNode, delNodeHint, inode, excessReplicateMapTmp);
}
/**
* We want "replication" replicates for the block, but we now have too many.
* In this method, copy enough nodes from 'srcNodes' into 'dstNodes' such that:
* <p/>
* srcNodes.size() - dstNodes.size() == replication
* <p/>
* We pick node that make sure that replicas are spread across racks and
* also try hard to pick one with least free space.
* The algorithm is first to pick a node with least free space from nodes
* that are on a rack holding more than one replicas of the block.
* So removing such a replica won't remove a rack.
* If no such a node is available,
* then pick a node with least free space
*/
void chooseExcessReplicates(Collection<DatanodeDescriptor> nonExcess,
Block b, short replication,
DatanodeDescriptor addedNode,
DatanodeDescriptor delNodeHint,
INodeFile inode,
List<DatanodeID> excessReplicateMapTmp) {
// first form a rack to datanodes map and
HashMap<String, ArrayList<DatanodeDescriptor>> rackMap =
new HashMap<String, ArrayList<DatanodeDescriptor>>();
for (Iterator<DatanodeDescriptor> iter = nonExcess.iterator();
iter.hasNext();) {
DatanodeDescriptor node = iter.next();
String rackName = node.getNetworkLocation();
ArrayList<DatanodeDescriptor> datanodeList = rackMap.get(rackName);
if (datanodeList == null) {
datanodeList = new ArrayList<DatanodeDescriptor>();
}
datanodeList.add(node);
rackMap.put(rackName, datanodeList);
}
// split nodes into two sets
// priSet contains nodes on rack with more than one replica
// remains contains the remaining nodes
ArrayList<DatanodeDescriptor> priSet = new ArrayList<DatanodeDescriptor>();
ArrayList<DatanodeDescriptor> remains = new ArrayList<DatanodeDescriptor>();
for (Iterator<Entry<String, ArrayList<DatanodeDescriptor>>> iter =
rackMap.entrySet().iterator(); iter.hasNext();) {
Entry<String, ArrayList<DatanodeDescriptor>> rackEntry = iter.next();
ArrayList<DatanodeDescriptor> datanodeList = rackEntry.getValue();
if (datanodeList.size() == 1) {
remains.add(datanodeList.get(0));
} else {
priSet.addAll(datanodeList);
}
}
// pick one node to delete that favors the delete hint
// otherwise pick one with least space from priSet if it is not empty
// otherwise one node with least space from remains
boolean firstOne = true;
while (nonExcess.size() - replication > 0) {
DatanodeInfo cur = null;
long minSpace = Long.MAX_VALUE;
// check if we can del delNodeHint
if (firstOne && delNodeHint != null && nonExcess.contains(delNodeHint) &&
(priSet.contains(delNodeHint) || (addedNode != null && !priSet.contains(addedNode)))) {
cur = delNodeHint;
} else { // regular excessive replica removal
cur = replicator.chooseReplicaToDelete(inode, b, replication, priSet, remains);
}
firstOne = false;
// adjust rackmap, priSet, and remains
String rack = cur.getNetworkLocation();
ArrayList<DatanodeDescriptor> datanodes = rackMap.get(rack);
datanodes.remove(cur);
if (datanodes.isEmpty()) {
rackMap.remove(rack);
}
if (priSet.remove(cur)) {
if (datanodes.size() == 1) {
priSet.remove(datanodes.get(0));
remains.add(datanodes.get(0));
}
} else {
remains.remove(cur);
}
nonExcess.remove(cur);
excessReplicateMapTmp.add(cur);
if (NameNode.stateChangeLog.isDebugEnabled()) {
NameNode.stateChangeLog.debug("BLOCK* NameSystem.chooseExcessReplicates: "
+ "(" + cur.getName() + ", " + b
+ ") is added to excessReplicateMapTmp");
}
}
}
public void blockReceivedAndDeleted(DatanodeRegistration nodeReg,
Block receivedAndDeletedBlocks[]) throws IOException {
int received = 0;
int deleted = 0;
int processTime = 0;
writeLock();
long startTime = now();
try {
DatanodeDescriptor node = getDatanode(nodeReg);
if (node == null || !node.isAlive) {
NameNode.stateChangeLog.warn("BLOCK* NameSystem.blockReceivedDeleted" +
" is received from dead or unregistered node " + nodeReg.getName());
throw new IOException(
"Got blockReceivedDeleted message from unregistered or dead node " + nodeReg.getName());
}
if (NameNode.stateChangeLog.isDebugEnabled()) {
NameNode.stateChangeLog.debug("BLOCK* NameSystem.blockReceivedDeleted"
+ " is received from " + nodeReg.getName());
}
for (int i = 0; i < receivedAndDeletedBlocks.length; i++) {
//avatar datanode mighs send nulls in the array
if (receivedAndDeletedBlocks[i] == null) {
continue;
}
if (DFSUtil.isDeleted(receivedAndDeletedBlocks[i])) {
removeStoredBlock(receivedAndDeletedBlocks[i], node);
// only leave received block in the array
receivedAndDeletedBlocks[i] = null;
deleted++;
} else {
blockReceived(receivedAndDeletedBlocks[i],
receivedAndDeletedBlocks[i].getDelHints(),node);
received++;
}
}
} finally {
processTime = (int)(now() - startTime);
writeUnlock();
if (received + deleted > 10) {
// Only log for bigger incremental block reports.
// This will cut a lot of logging.
NameNode.stateChangeLog.info("*BLOCK* NameNode.blockReceivedAndDeleted: "
+ "from " + nodeReg.getName() + " took " + processTime
+ "ms: (#received = " + received + ", "
+ " #deleted = " + deleted + ")");
}
if(!isInStartupSafeMode()){
int count = 0;
// At startup time, because too many new blocks come in
// they take up lots of space in the log file.
// So, we log only when namenode is out of safemode.
// We log only blockReceived messages.
for (int i = 0; i < receivedAndDeletedBlocks.length; i++) {
// log only the ones that have been processed
if (count > received) {
break;
}
Block blk = receivedAndDeletedBlocks[i];
if (blk == null)
continue;
++count;
if (blk.getNumBytes() != BlockFlags.NO_ACK) {
NameNode.stateChangeLog.info("BLOCK* NameSystem.blockReceived: "
+ "blockMap updated: " + nodeReg.getName() + " is added to "
+ receivedAndDeletedBlocks[i] + " size "
+ receivedAndDeletedBlocks[i].getNumBytes());
} else {
NameNode.stateChangeLog.info("BLOCK* NameSystem.blockReceived: "
+ "for block "
+ receivedAndDeletedBlocks[i] + " was rejected");
}
}
}
}
}
public void blockReceivedAndDeleted(DatanodeRegistration nodeReg,
IncrementalBlockReport receivedAndDeletedBlocks)
throws IOException {
int received = 0;
int deleted = 0;
int processTime = 0;
Block blk = new Block();
writeLock();
long startTime = now();
try {
DatanodeDescriptor node = getDatanode(nodeReg);
if (node == null || !node.isAlive) {
NameNode.stateChangeLog.warn("BLOCK* NameSystem.blockReceivedDeleted" +
" is received from dead or unregistered node " + nodeReg.getName());
throw new IOException(
"Got blockReceivedDeleted message from unregistered or dead node " + nodeReg.getName());
}
if (NameNode.stateChangeLog.isDebugEnabled()) {
NameNode.stateChangeLog.debug("BLOCK* NameSystem.blockReceivedDeleted"
+ " is received from " + nodeReg.getName());
}
receivedAndDeletedBlocks.resetIterator();
while(receivedAndDeletedBlocks.hasNext()) {
String hint = receivedAndDeletedBlocks.getNext(blk);
//avatar datanode mighs send nulls in the array
if (blk.getNumBytes() == BlockFlags.IGNORE) {
continue;
}
if (DFSUtil.isDeleted(blk)) {
removeStoredBlock(blk, node);
deleted++;
} else {
blockReceived(blk, hint, node);
received++;
}
}
} finally {
processTime = (int)(now() - startTime);
writeUnlock();
if (received + deleted > 10) {
// Only log for bigger incremental block reports.
// This will cut a lot of logging.
NameNode.stateChangeLog.info("*BLOCK* NameNode.blockReceivedAndDeleted: "
+ "from " + nodeReg.getName() + " took " + processTime
+ "ms: (#received = " + received + ", "
+ " #deleted = " + deleted + ")");
}
if(!isInStartupSafeMode()){
int count = 0;
// At startup time, because too many new blocks come in
// they take up lots of space in the log file.
// So, we log only when namenode is out of safemode.
// We log only blockReceived messages.
receivedAndDeletedBlocks.resetIterator();
while(receivedAndDeletedBlocks.hasNext()) {
receivedAndDeletedBlocks.getNext(blk);
if (count > received) {
break;
}
if (DFSUtil.isDeleted(blk) || blk.getNumBytes() == BlockFlags.IGNORE)
continue;
++count;
if (blk.getNumBytes() != BlockFlags.NO_ACK) {
NameNode.stateChangeLog.info("BLOCK* NameSystem.blockReceived: "
+ "blockMap updated: " + nodeReg.getName() + " is added to "
+ blk + " size "
+ blk.getNumBytes());
} else {
NameNode.stateChangeLog.info("BLOCK* NameSystem.blockReceived: "
+ "for block "
+ blk + " was rejected");
}
}
}
}
}
/**
* Modify (block-->datanode) map. Possibly generate
* replication tasks, if the removed block is still valid.
*/
private void removeStoredBlock(Block block, DatanodeDescriptor node) {
assert (hasWriteLock());
if (NameNode.stateChangeLog.isDebugEnabled()) {
NameNode.stateChangeLog.debug("BLOCK* NameSystem.removeStoredBlock: "
+ block + " from " + node.getName());
}
if (!blocksMap.removeNode(block, node)) {
if (NameNode.stateChangeLog.isDebugEnabled()) {
NameNode.stateChangeLog.debug("BLOCK* NameSystem.removeStoredBlock: "
+ block + " has already been removed from node " + node);
}
return;
}
//
// if file is being actively written to and it is the last block,
// then do not check replication-factor here.
//
BlockInfo storedBlock = blocksMap.getStoredBlock(block);
INodeFile fileINode = storedBlock == null ? null : storedBlock.getINode();
if (fileINode != null &&
fileINode.isUnderConstruction() && fileINode.isLastBlock(storedBlock)
&& !node.isDecommissionInProgress() && !node.isDecommissioned()) {
decrementSafeBlockCount(block);
return;
}
//
// It's possible that the block was removed because of a datanode
// failure. If the block is still valid, check if replication is
// necessary. In that case, put block on a possibly-will-
// be-replicated list.
//
if (fileINode != null) {
decrementSafeBlockCount(block);
// handle under replication
// Use storedBlock here because block maybe a deleted block with size DELETED
NumberReplicas num = countNodes(storedBlock);
int numCurrentReplicas = num.liveReplicas() +
pendingReplications.getNumReplicas(storedBlock);
updateNeededReplicationQueue(storedBlock, -1, numCurrentReplicas,
num.decommissionedReplicas, node, fileINode.getReplication());
}
//
// We've removed a block from a node, so it's definitely no longer
// in "excess" there.
//
removeFromExcessReplicateMap(block, node);
// Remove the replica from corruptReplicas
corruptReplicas.removeFromCorruptReplicasMap(block, node);
}
/**
* Update a block's priority queue in neededReplicaiton queues
*
* @param block block
* @param delta the change of number of replicas
* @param numCurrentReplicas current number of replicas
* @param numCurrentDecommissionedReplicas current number of decommissioed replicas
* @param node the node where the replica resides
* @param fileReplication expected number of replicas
*/
private void updateNeededReplicationQueue(Block block, int delta,
int numCurrentReplicas, int numCurrentDecommissionedReplicas,
DatanodeDescriptor node, short fileReplication) {
int numOldReplicas = numCurrentReplicas;
int numOldDecommissionedReplicas = numCurrentDecommissionedReplicas;
if (node.isDecommissioned() || node.isDecommissionInProgress()) {
numOldDecommissionedReplicas -= delta;
} else {
numOldReplicas -= delta;
}
if (fileReplication > numOldReplicas) {
neededReplications.remove(block, numOldReplicas,
numOldDecommissionedReplicas, fileReplication);
}
if (fileReplication > numCurrentReplicas) {
neededReplications.add(block, numCurrentReplicas,
numCurrentDecommissionedReplicas, fileReplication);
}
}
private void removeFromExcessReplicateMap(Block block, DatanodeDescriptor node){
// No need for lock until we start accepting requests from clients.
assert (!nameNode.isRpcServerRunning() || hasWriteLock());
Collection<Block> excessBlocks = excessReplicateMap.get(node.getStorageID());
if (excessBlocks != null) {
if (excessBlocks.remove(block)) {
excessBlocksCount--;
if (NameNode.stateChangeLog.isDebugEnabled()) {
NameNode.stateChangeLog.debug("BLOCK* NameSystem.removeFromExcessReplicateMap: "
+ block + " is removed from excessBlocks");
}
if (excessBlocks.size() == 0) {
excessReplicateMap.remove(node.getStorageID());
}
}
}
}
private void removeFromExcessReplicateMap(Block block){
// No need for lock until we start accepting requests from clients.
assert (!nameNode.isRpcServerRunning() || hasWriteLock());
for (Iterator<DatanodeDescriptor> it =
blocksMap.nodeIterator(block); it.hasNext();) {
DatanodeDescriptor node = it.next();
removeFromExcessReplicateMap(block, node);
}
}
/**
* The given node is reporting that it received a certain block.
*/
private void blockReceived(Block block,
String delHint,
DatanodeDescriptor node) throws IOException {
assert (hasWriteLock());
// decrement number of blocks scheduled to this datanode.
node.decBlocksScheduled();
// get the deletion hint node
DatanodeDescriptor delHintNode = null;
if (delHint != null && delHint.length() != 0) {
delHintNode = datanodeMap.get(delHint);
if (delHintNode == null) {
NameNode.stateChangeLog.warn("BLOCK* NameSystem.blockReceived: "
+ block
+ " is expected to be removed from an unrecorded node "
+ delHint);
}
}
//
// Modify the blocks->datanode map and node's map.
//
pendingReplications.remove(block);
addStoredBlock(block, node, delHintNode);
}
public long getMissingBlocksCount() {
// not locking
return neededReplications.getCorruptBlocksCount();
}
public String getRaidHttpUrl() {
return this.getConf().get(
FSConstants.DFS_RAIDNODE_HTTP_ADDRESS_KEY, null);
}
long[] getStats() throws IOException {
checkSuperuserPrivilege();
synchronized (heartbeats) {
return new long[]{this.capacityTotal, this.capacityUsed,
this.capacityRemaining,
this.underReplicatedBlocksCount,
this.corruptReplicaBlocksCount,
getMissingBlocksCount(),
this.capacityNamespaceUsed};
}
}
/**
* Total raw bytes including non-dfs used space.
*/
public long getCapacityTotal() {
synchronized (heartbeats) {
return this.capacityTotal;
}
}
/**
* Total used space by data nodes
*/
public long getCapacityUsed() {
synchronized (heartbeats) {
return this.capacityUsed;
}
}
/**
* Total used space by data nodes as percentage of total capacity
*/
public float getCapacityUsedPercent() {
synchronized (heartbeats) {
if (capacityTotal <= 0) {
return 100;
}
return ((float) capacityUsed * 100.0f) / (float) capacityTotal;
}
}
/**
* Total namespace used space by data nodes
*/
public long getCapacityNamespaceUsed() {
synchronized (heartbeats) {
return this.capacityNamespaceUsed;
}
}
/**
* Total used space by data nodes as percentage of total capacity
*/
public float getCapacityNamespaceUsedPercent() {
synchronized (heartbeats) {
if (capacityTotal <= 0) {
return 100;
}
return ((float) capacityNamespaceUsed * 100.0f) / (float) capacityTotal;
}
}
/**
* Total used space by data nodes for non DFS purposes such
* as storing temporary files on the local file system
*/
public long getCapacityUsedNonDFS() {
long nonDFSUsed = 0;
synchronized (heartbeats) {
nonDFSUsed = capacityTotal - capacityRemaining - capacityUsed;
}
return nonDFSUsed < 0 ? 0 : nonDFSUsed;
}
/**
* Total non-used raw bytes.
*/
public long getCapacityRemaining() {
synchronized (heartbeats) {
return this.capacityRemaining;
}
}
/**
* Total remaining space by data nodes as percentage of total capacity
*/
public float getCapacityRemainingPercent() {
synchronized (heartbeats) {
if (capacityTotal <= 0) {
return 0;
}
return ((float) capacityRemaining * 100.0f) / (float) capacityTotal;
}
}
/**
* Total number of connections.
*/
public int getTotalLoad() {
synchronized (heartbeats) {
return this.totalLoad;
}
}
int getNumberOfDatanodes(DatanodeReportType type) {
return getDatanodeListForReport(type).size();
}
private ArrayList<DatanodeDescriptor> getDatanodeListForReport(
DatanodeReportType type) {
readLock();
try {
boolean listLiveNodes = type == DatanodeReportType.ALL ||
type == DatanodeReportType.LIVE;
boolean listDeadNodes = type == DatanodeReportType.ALL ||
type == DatanodeReportType.DEAD;
HashSet<String> mustList = new HashSet<String>();
if (listDeadNodes) {
//first load all the nodes listed in include and exclude files.
for (Iterator<String> it = hostsReader.getHosts().iterator();
it.hasNext();) {
mustList.add(it.next());
}
for (Iterator<String> it = hostsReader.getExcludedHosts().iterator();
it.hasNext();) {
mustList.add(it.next());
}
}
ArrayList<DatanodeDescriptor> nodes = null;
synchronized (datanodeMap) {
nodes = new ArrayList<DatanodeDescriptor>(datanodeMap.size() +
mustList.size());
for (Iterator<DatanodeDescriptor> it = datanodeMap.values().iterator();
it.hasNext();) {
DatanodeDescriptor dn = it.next();
boolean isDead = isDatanodeDead(dn);
//Remove any form of the this datanode in include/exclude lists.
mustList.remove(dn.getName());
mustList.remove(dn.getHost());
mustList.remove(dn.getHostName());
mustList.remove(dn.getHostName() + ":" + dn.getPort());
if (!isDead && listLiveNodes && this.inHostsList(dn, null)) {
nodes.add(dn);
} else if (isDead && listDeadNodes &&
(inHostsList(dn, null) || inExcludedHostsList(dn, null))) {
nodes.add(dn);
}
}
}
if (listDeadNodes) {
for (Iterator<String> it = mustList.iterator(); it.hasNext();) {
DatanodeDescriptor dn =
new DatanodeDescriptor(new DatanodeID(it.next()));
//This node has never been alive, set starttime to the 0
dn.setStartTime(0);
dn.setLastUpdate(0);
nodes.add(dn);
}
}
return nodes;
} finally {
readUnlock();
}
}
public DatanodeInfo[] datanodeReport(DatanodeReportType type
) throws AccessControlException {
readLock();
try {
checkSuperuserPrivilege();
ArrayList<DatanodeDescriptor> results = getDatanodeListForReport(type);
DatanodeInfo[] arr = new DatanodeInfo[results.size()];
for (int i = 0; i < arr.length; i++) {
arr[i] = new DatanodeInfo(results.get(i));
}
return arr;
} finally {
readUnlock();
}
}
/**
* Save namespace image.
* This will save current namespace into fsimage file and empty edits file.
* Requires superuser privilege and safe mode.
*
* @param force if true, then the namenode need not already be in safemode.
* @throws AccessControlException if superuser privilege is violated.
* @throws IOException if
*/
void saveNamespace(boolean force, boolean uncompressed) throws AccessControlException, IOException {
writeLock();
try {
checkSuperuserPrivilege();
if(!force && !isInSafeMode()) {
throw new IOException("Safe mode should be turned ON " +
"in order to create namespace image.");
}
getFSImage().saveNamespace(uncompressed, true);
LOG.info("New namespace image has been created.");
} finally {
writeUnlock();
}
}
/**
*/
public void DFSNodesStatus(ArrayList<DatanodeDescriptor> live,
ArrayList<DatanodeDescriptor> dead) {
readLock();
try {
ArrayList<DatanodeDescriptor> results =
getDatanodeListForReport(DatanodeReportType.ALL);
for (Iterator<DatanodeDescriptor> it = results.iterator(); it.hasNext();) {
DatanodeDescriptor node = it.next();
if (isDatanodeDead(node)) {
dead.add(node);
} else {
live.add(node);
}
}
} finally {
readUnlock();
}
}
/**
* Prints information about all datanodes.
*/
private void datanodeDump(PrintWriter out) {
readLock();
try {
synchronized (datanodeMap) {
out.println("Metasave: Number of datanodes: " + datanodeMap.size());
for (Iterator<DatanodeDescriptor> it = datanodeMap.values().iterator(); it.hasNext();) {
DatanodeDescriptor node = it.next();
out.println(node.dumpDatanode());
}
}
} finally {
readUnlock();
}
}
/**
* Start decommissioning the specified datanode.
*/
private void startDecommission(DatanodeDescriptor node)
throws IOException {
if (!node.isDecommissionInProgress() && !node.isDecommissioned()) {
LOG.info("Start Decommissioning node " + node.getName() + " with " +
node.numBlocks() + " blocks.");
synchronized (heartbeats) {
updateStats(node, false);
node.startDecommission();
updateStats(node, true);
}
if (((Monitor) dnthread.getRunnable()).startDecommision(node)) {
node.setStartTime(now());
}
} else if (node.isDecommissionInProgress()) {
if (((Monitor) dnthread.getRunnable()).startDecommision(node)) {
node.setStartTime(now());
}
}
}
/**
* Stop decommissioning the specified datanodes.
*/
private void stopDecommission(DatanodeDescriptor node)
throws IOException {
if ((node.isDecommissionInProgress() &&
((Monitor) dnthread.getRunnable()).stopDecommission(node)) ||
node.isDecommissioned()) {
LOG.info("Stop Decommissioning node " + node.getName());
synchronized (heartbeats) {
updateStats(node, false);
node.stopDecommission();
updateStats(node, true);
}
}
}
/**
*/
public DatanodeInfo getDataNodeInfo(String name) {
return datanodeMap.get(name);
}
/**
* returns the namenode object that was used to initialize this namesystem
*/
public NameNode getNameNode() {
return this.nameNode;
}
/**
* Whether or not we should fail on a txid mismatch.
*/
public boolean failOnTxIdMismatch() {
return this.nameNode.failOnTxIdMismatch();
}
/**
* @deprecated use {@link NameNode#getNameNodeAddress()} instead.
*/
@Deprecated
public InetSocketAddress getDFSNameNodeAddress() {
return nameNodeAddress;
}
/**
*/
public Date getStartTime() {
return new Date(systemStart);
}
short getMaxReplication() {
return (short) maxReplication;
}
short getMinReplication() {
return (short) minReplication;
}
short getDefaultReplication() {
return (short) defaultReplication;
}
public void stallReplicationWork() {
stallReplicationWork = true;
}
public void restartReplicationWork() {
stallReplicationWork = false;
}
/**
* A immutable object that stores the number of live replicas and
* the number of decommissined Replicas.
*/
static class NumberReplicas {
private int liveReplicas;
private int decommissionedReplicas;
private int corruptReplicas;
private int excessReplicas;
NumberReplicas() {
initialize(0, 0, 0, 0);
}
NumberReplicas(int live, int decommissioned, int corrupt, int excess) {
initialize(live, decommissioned, corrupt, excess);
}
void initialize(int live, int decommissioned, int corrupt, int excess) {
liveReplicas = live;
decommissionedReplicas = decommissioned;
corruptReplicas = corrupt;
excessReplicas = excess;
}
int liveReplicas() {
return liveReplicas;
}
int decommissionedReplicas() {
return decommissionedReplicas;
}
int corruptReplicas() {
return corruptReplicas;
}
int excessReplicas() {
return excessReplicas;
}
int getTotal() {
return liveReplicas + decommissionedReplicas +
corruptReplicas + excessReplicas;
}
}
/**
* Counts the number of nodes in the given list into active and
* decommissioned counters.
*/
private NumberReplicas countNodes(Block b,
Iterator<DatanodeDescriptor> nodeIter) {
int count = 0;
int live = 0;
int corrupt = 0;
int excess = 0;
Collection<DatanodeDescriptor> nodesCorrupt = corruptReplicas.getNodes(b);
while (nodeIter.hasNext()) {
DatanodeDescriptor node = nodeIter.next();
if ((nodesCorrupt != null) && (nodesCorrupt.contains(node))) {
corrupt++;
} else if (node.isDecommissionInProgress() || node.isDecommissioned()) {
count++;
} else {
Collection<Block> blocksExcess =
excessReplicateMap.get(node.getStorageID());
if (blocksExcess != null && blocksExcess.contains(b)) {
excess++;
} else {
live++;
}
}
}
return new NumberReplicas(live, count, corrupt, excess);
}
/**
* Counts the number of live nodes in the given list
*/
private int countLiveNodes(Block b, Iterator<DatanodeDescriptor> nodeIter) {
int live = 0;
Collection<DatanodeDescriptor> nodesCorrupt = null;
if (corruptReplicas.size() != 0) {
nodesCorrupt = corruptReplicas.getNodes(b);
}
while (nodeIter.hasNext()) {
DatanodeDescriptor node = nodeIter.next();
if (((nodesCorrupt != null) && (nodesCorrupt.contains(node))) ||
node.isDecommissionInProgress() || node.isDecommissioned()) {
// do nothing
} else {
live++;
}
}
return live;
}
/**
* Return the number of nodes that are live
*/
int countLiveNodes(Block b) {
return countLiveNodes(b, blocksMap.nodeIterator(b));
}
/**
* Return the number of nodes that are live and decommissioned.
*/
NumberReplicas countNodes(Block b) {
return countNodes(b, blocksMap.nodeIterator(b));
}
private void logBlockReplicationInfo(Block block, DatanodeDescriptor srcNode,
NumberReplicas num) {
int curReplicas = num.liveReplicas();
int curExpectedReplicas = getReplication(block);
INode fileINode = blocksMap.getINode(block);
Iterator<DatanodeDescriptor> nodeIter = blocksMap.nodeIterator(block);
StringBuffer nodeList = new StringBuffer();
while (nodeIter.hasNext()) {
DatanodeDescriptor node = nodeIter.next();
nodeList.append(node.name);
nodeList.append(" ");
}
FSNamesystem.LOG.info("Block: " + block + ", Expected Replicas: "
+ curExpectedReplicas + ", live replicas: " + curReplicas
+ ", corrupt replicas: " + num.corruptReplicas()
+ ", decommissioned replicas: " + num.decommissionedReplicas()
+ ", excess replicas: " + num.excessReplicas() + ", Is Open File: "
+ fileINode.isUnderConstruction() + ", Datanodes having this block: "
+ nodeList + ", Current Datanode: " + srcNode.name
+ ", Is current datanode decommissioning: "
+ srcNode.isDecommissionInProgress());
}
/**
* Check if a block on srcNode has reached its replication factor or not
*
*@param status decomission status to update; null means no update
* @param srcNode a datanode
* @param block a block
* @param addToNeeded if the block needs to add to needReplication queue
* @return block if not addToNeeded and the block needes to added later
*/
Block isReplicationInProgress(final DecommissioningStatus status,
final DatanodeDescriptor srcNode, final Block block,
boolean addToNeeded) {
INode fileINode = blocksMap.getINode(block);
if (fileINode == null) {
return null;
}
NumberReplicas num = countNodes(block);
int curReplicas = num.liveReplicas();
int curExpectedReplicas = getReplication(block);
if (curExpectedReplicas > curReplicas) {
if (status!= null) {
//Log info about one block for this node which needs replication
if (status.underReplicatedBlocks == 0) {
logBlockReplicationInfo(block, srcNode, num);
}
status.underReplicatedBlocks++;
if ((curReplicas == 0) && (num.decommissionedReplicas() > 0)) {
status.decommissionOnlyReplicas++;
}
if (fileINode.isUnderConstruction()) {
status.underReplicatedInOpenFiles++;
}
}
if (!neededReplications.contains(block) &&
pendingReplications.getNumReplicas(block) == 0) {
//
// These blocks have been reported from the datanode
// after the startDecommission method has been executed. These
// blocks were in flight when the decommissioning was started.
//
if (addToNeeded) {
neededReplications.add(block,
curReplicas,
num.decommissionedReplicas(),
curExpectedReplicas);
} else {
return block;
}
}
}
return null;
}
/**
* Keeps track of which datanodes/ipaddress are allowed to connect to the namenode.
*/
private boolean inHostsList(DatanodeID node, String ipAddr) {
Set<String> hostsList = hostsReader.getHosts();
return (hostsList.isEmpty() ||
(ipAddr != null && hostsList.contains(ipAddr)) ||
hostsList.contains(node.getHost()) ||
hostsList.contains(node.getName()) ||
((node instanceof DatanodeInfo) && (
hostsList.contains(((DatanodeInfo) node).getHostName()) ||
hostsList.contains(((DatanodeInfo) node).getHostName() + ":" + node.getPort()))))
;
}
public boolean inExcludedHostsList(DatanodeID node, String ipAddr) {
Set<String> excludeList = hostsReader.getExcludedHosts();
return ((ipAddr != null && excludeList.contains(ipAddr)) ||
excludeList.contains(node.getHost()) ||
excludeList.contains(node.getName()) ||
((node instanceof DatanodeInfo) &&
excludeList.contains(((DatanodeInfo) node).getHostName())));
}
/**
* Rereads the config to get hosts and exclude list file names.
* Rereads the files to update the hosts and exclude lists. It
* checks if any of the hosts have changed states:
* 1. Added to hosts --> no further work needed here.
* 2. Removed from hosts --> mark AdminState as decommissioned.
* 3. Added to exclude --> start decommission.
* 4. Removed from exclude --> stop decommission.
*/
public void refreshNodes(Configuration conf) throws IOException {
checkSuperuserPrivilege();
// Reread the config to get dfs.hosts and dfs.hosts.exclude filenames.
// Update the file names and refresh internal includes and excludes list
if (conf == null) {
conf = new Configuration();
}
hostsReader.updateFileNames(conf.get("dfs.hosts", ""),
conf.get("dfs.hosts.exclude", ""));
Set<String> includes = hostsReader.getNewIncludes();
Set<String> excludes = hostsReader.getNewExcludes();
Set<String> prevIncludes = hostsReader.getHosts();
Set<String> prevExcludes = hostsReader.getExcludedHosts();
// We need to syncrhonize on hostsReader here so that no thread reads from
// hostsReader between the two updates to hostsReader in this function.
synchronized (hostsReader) {
hostsReader.switchFiles(includes, excludes);
try {
replicator.hostsUpdated();
} catch (DefaultRackException e) {
// We want to update the includes and excludes files only if hostsUpdated,
// doesn't throw an exception. This avoids inconsitency between the
// replicator and the fnamesystem especially for
// BlockPlacementPolicyConfigurable.
hostsReader.switchFiles(prevIncludes, prevExcludes);
throw e;
}
}
writeLock();
try {
for (Iterator<DatanodeDescriptor> it = datanodeMap.values().iterator();
it.hasNext();) {
DatanodeDescriptor node = it.next();
// Check if not include.
if (!inHostsList(node, null)) {
node.setDisallowed(true); // case 2.
} else {
if (inExcludedHostsList(node, null)) {
startDecommission(node); // case 3.
} else {
stopDecommission(node); // case 4.
}
}
}
} finally {
writeUnlock();
}
}
void finalizeUpgrade() throws IOException {
checkSuperuserPrivilege();
getFSImage().finalizeUpgrade();
}
/**
* Checks if the node is not on the hosts list. If it is not, then
* it will be disallowed from registering.
*/
private boolean verifyNodeRegistration(DatanodeRegistration nodeReg, String ipAddr)
throws IOException {
assert (hasWriteLock());
return inHostsList(nodeReg, ipAddr);
}
/**
* Decommission the node if it is in exclude list.
*/
private void checkDecommissioning(DatanodeDescriptor nodeReg, String ipAddr)
throws IOException {
// If the registered node is in exclude list, then decommission it
if (inExcludedHostsList(nodeReg, ipAddr)) {
startDecommission(nodeReg);
}
}
/**
* Get data node by storage ID.
*
* @param nodeID
* @return DatanodeDescriptor or null if the node is not found.
* @throws IOException
*/
public DatanodeDescriptor getDatanode(DatanodeID nodeID) throws IOException {
UnregisteredDatanodeException e = null;
DatanodeDescriptor node = datanodeMap.get(nodeID.getStorageID());
if (node == null) {
return null;
}
if (!node.getName().equals(nodeID.getName())) {
e = new UnregisteredDatanodeException(nodeID, node);
NameNode.stateChangeLog.fatal("BLOCK* NameSystem.getDatanode: "
+ e.getLocalizedMessage());
throw e;
}
return node;
}
/**
* Stop at and return the datanode at index (used for content browsing)
*/
@Deprecated
private DatanodeDescriptor getDatanodeByIndex(int index) {
int i = 0;
for (DatanodeDescriptor node : datanodeMap.values()) {
if (i == index) {
return node;
}
i++;
}
return null;
}
@Deprecated
public String randomDataNode() {
int size = datanodeMap.size();
int index = 0;
if (size != 0) {
index = r.nextInt(size);
for (int i = 0; i < size; i++) {
DatanodeDescriptor d = getDatanodeByIndex(index);
if (d != null && !d.isDecommissioned() && !isDatanodeDead(d) &&
!d.isDecommissionInProgress()) {
return d.getHost() + ":" + d.getInfoPort();
}
index = (index + 1) % size;
}
}
return null;
}
public DatanodeDescriptor getRandomDatanode() {
return replicator.chooseTarget("", 1, null,
new ArrayList<DatanodeDescriptor>(), 0)[0];
}
/**
* Current system time.
*
* @return current time in msec.
*/
static long now() {
return System.currentTimeMillis();
}
boolean setSafeMode(SafeModeAction action) throws IOException {
if (action != SafeModeAction.SAFEMODE_GET) {
checkSuperuserPrivilege();
switch (action) {
case SAFEMODE_LEAVE: // leave safe mode
if (!manualOverrideSafeMode) {
leaveSafeMode(false);
} else {
LOG.warn("Leaving safemode is not allowed. " + manualOverrideSafeMode);
}
break;
case SAFEMODE_ENTER: // enter safe mode
enterSafeMode();
break;
}
}
return isInSafeMode();
}
/**
* Allow the ability to let an external API manually override exiting safemode
*/
void setSafeModeManualOverride(boolean flag) {
this.manualOverrideSafeMode = flag;
}
/**
* Check whether the name node is in safe mode.
*
* @return true if safe mode is ON, false otherwise
*/
public synchronized boolean isInSafeMode() {
if (safeMode == null) {
return false;
}
return safeMode.isOn();
}
/**
* Check whether replication queues are populated.
*/
synchronized boolean isPopulatingReplQueues() {
return (!isInSafeMode() || initializedReplQueues);
}
/**
* Check whether the name node is in startup mode.
*/
synchronized boolean isInStartupSafeMode() {
if (safeMode == null)
return false;
return safeMode.isOn() && !safeMode.isManual();
}
/**
* Increment number of blocks that reached minimal replication.
*
* @param replication current replication
* @param skipCheck if true the safemode will not be checked -
* used for processing initial block reports to skip the
* check for every block - at the end checkSafeMode() must be called
*/
void incrementSafeBlockCount(int replication, boolean skipCheck) {
if (safeMode != null && safeMode.isOn()) {
if ((int) replication == minReplication) {
this.blocksSafe++;
if(!skipCheck) {
safeMode.checkMode();
}
}
}
}
/**
* Check the safemode. Used after processing a batch of blocks
* to avoid multiple check() calls.
*/
void checkSafeMode() {
if (safeMode != null && safeMode.isOn()) {
safeMode.checkMode();
}
}
/**
* This method is invoked just before removing a block from the
* {@link #blocksMap}. It is used to correctly update the safe block count
* when a block is removed from the {@link #blocksMap}. If the current
* replication for the block is greater than {@link #minReplication} this
* means that the safe block count has not already been decremented for this
* block and hence we should decrement the safe block count.
*
* @param b
* the block that has to be removed.
*/
void decrementSafeBlockCountForBlockRemoval(Block b) {
if (safeMode != null && safeMode.isOn()) {
int replication = (short) countNodes(b).liveReplicas();
if (replication >= minReplication) {
this.blocksSafe--;
safeMode.checkMode();
}
}
}
/**
* Decrement number of blocks that reached minimal replication.
*/
void decrementSafeBlockCount(Block b) {
if (safeMode != null && safeMode.isOn()) {
int replication = (short) countNodes(b).liveReplicas();
if (replication == minReplication - 1) {
this.blocksSafe--;
safeMode.checkMode();
}
}
}
/**
* Retrieve the total number of safe blocks in the file system.
*
* @return a long denoting the total number of safe blocks
*/
public long getSafeBlocks() {
return this.blocksSafe;
}
public SafeModeInfo getSafeModeInstance() {
return this.safeMode;
}
/**
* Ratio of the number of safe blocks to the total number of blocks.
*/
public double getSafeBlockRatio() {
long blockTotal = getBlocksTotal();
return (blockTotal == this.blocksSafe ? 1 : (double) this.blocksSafe
/ (double) blockTotal);
}
/**
* Get the total number of blocks in the system.
*/
public long getBlocksTotal() {
return blocksMap.size();
}
/**
* Enter safe mode manually.
*
* @throws IOException
*/
void enterSafeMode() throws IOException {
writeLock();
try {
if (!isInSafeMode()) {
safeMode = SafeModeUtil.getInstance(this);
safeMode.setManual();
return;
}
safeMode.setManual();
getEditLog().logSyncAll();
NameNode.stateChangeLog.info("STATE* Safe mode is ON. "
+ safeMode.getTurnOffTip());
} finally {
writeUnlock();
}
}
/**
* Leave safe mode.
*
* @throws IOException
*/
void leaveSafeMode(boolean checkForUpgrades) throws SafeModeException {
writeLock();
try {
if (!isInSafeMode()) {
NameNode.stateChangeLog.info("STATE* Safe mode is already OFF.");
return;
}
if (getDistributedUpgradeState()) {
throw new SafeModeException("Distributed upgrade is in progress",
safeMode);
}
safeMode.leave(checkForUpgrades);
safeMode = null;
} finally {
writeUnlock();
}
}
String getSafeModeTip() {
if (!isInSafeMode()) {
return "";
}
return safeMode.getTurnOffTip();
}
long getEditLogSize() throws IOException {
return getEditLog().getEditLogSize();
}
CheckpointSignature rollEditLog() throws IOException {
writeLock();
try {
if (isInSafeMode()) {
throw new SafeModeException("Checkpoint not created",
safeMode);
}
LOG.info("Roll Edit Log from " + Server.getRemoteAddress() +
" editlog file " + getFSImage().getEditLog().getFsEditName() +
" editlog timestamp " + getFSImage().getEditLog().getFsEditTime());
return getFSImage().rollEditLog();
} finally {
writeUnlock();
}
}
/**
* Moves fsimage.ckpt to fsImage and edits.new to edits
* Reopens the new edits file.
*
* @param newImageSignature the signature of the new image
*/
void rollFSImage(CheckpointSignature newImageSignature) throws IOException {
writeLock();
try {
if (isInSafeMode()) {
throw new SafeModeException("Checkpoint not created",
safeMode);
}
LOG.info("Roll FSImage from " + Server.getRemoteAddress());
getFSImage().rollFSImage(newImageSignature);
} finally {
writeUnlock();
}
}
/**
* Returns whether the given block is one pointed-to by a file.
*/
private boolean isValidBlock(Block b) {
return (blocksMap.getINode(b) != null);
}
// Distributed upgrade manager
final UpgradeManagerNamenode upgradeManager = new UpgradeManagerNamenode(this);
UpgradeStatusReport distributedUpgradeProgress(UpgradeAction action
) throws IOException {
return upgradeManager.distributedUpgradeProgress(action);
}
UpgradeCommand processDistributedUpgradeCommand(UpgradeCommand comm)
throws IOException {
return upgradeManager.processUpgradeCommand(comm);
}
int getDistributedUpgradeVersion() {
return upgradeManager.getUpgradeVersion();
}
UpgradeCommand getDistributedUpgradeCommand() throws IOException {
return upgradeManager.getBroadcastCommand();
}
boolean getDistributedUpgradeState() {
return upgradeManager.getUpgradeState();
}
short getDistributedUpgradeStatus() {
return upgradeManager.getUpgradeStatus();
}
boolean startDistributedUpgradeIfNeeded() throws IOException {
return upgradeManager.startUpgrade();
}
PermissionStatus createFsOwnerPermissions(FsPermission permission) {
return new PermissionStatus(fsOwner.getUserName(), supergroup, permission);
}
private FSPermissionChecker checkOwner(String path, INode[] inodes)
throws AccessControlException {
return checkPermission(path, inodes, true, null, null, null, null);
}
private FSPermissionChecker checkPathAccess(String path, INode[] inodes, FsAction access
) throws AccessControlException {
return checkPermission(path, inodes, false, null, null, access, null);
}
private FSPermissionChecker checkParentAccess(String path, INode[] inodes, FsAction access
) throws AccessControlException {
return checkPermission(path, inodes, false, null, access, null, null);
}
private FSPermissionChecker checkAncestorAccess(String path, INode[] inodes, FsAction access
) throws AccessControlException {
return checkPermission(path, inodes, false, access, null, null, null);
}
private FSPermissionChecker checkTraverse(String path, INode[] inodes
) throws AccessControlException {
return checkPermission(path, inodes, false, null, null, null, null);
}
private void checkSuperuserPrivilege() throws AccessControlException {
if (isPermissionEnabled) {
try {
PermissionChecker.checkSuperuserPrivilege(fsOwner, supergroup);
} catch (AccessControlException e) {
if (this.permissionAuditOnly) {
// do not throw the exception, we would like to only log.
LOG.warn("PermissionAudit superuser failed for user: " + fsOwner +
" group:" + supergroup);
} else {
throw e;
}
}
}
}
/**
* Check whether current user have permissions to access the path.
* For more details of the parameters, see
* {@link FSPermissionChecker#checkPermission(String, INodeDirectory, boolean, FsAction, FsAction, FsAction, FsAction)}.
*/
private FSPermissionChecker checkPermission(String path, INode[] inodes, boolean doCheckOwner,
FsAction ancestorAccess, FsAction parentAccess, FsAction access,
FsAction subAccess)
throws AccessControlException {
boolean permissionCheckFailed = false;
FSPermissionChecker pc = new FSPermissionChecker(
fsOwner.getUserName(), supergroup);
if (!pc.isSuper) {
dir.waitForReady();
readLock();
try {
pc.checkPermission(path, inodes, doCheckOwner,
ancestorAccess, parentAccess, access, subAccess);
} catch (AccessControlException e) {
if (!this.permissionAuditOnly) {
throw e;
}
permissionCheckFailed = true;
} finally {
readUnlock();
}
}
if (permissionCheckFailed) {
// do not throw the exception, we would like to only log.
LOG.warn("PermissionAudit failed on " + path +
" checkOwner:" + doCheckOwner +
" ancestor:" + ancestorAccess +
" parent:" + parentAccess +
" access:" + access +
" subaccess:" + subAccess);
}
return pc;
}
/**
* Check to see if we have exceeded the limit on the number
* of inodes.
*/
void checkFsObjectLimit() throws IOException {
if (maxFsObjects != 0 &&
maxFsObjects <= dir.totalInodes() + getBlocksTotal()) {
throw new IOException("Exceeded the configured number of objects " +
maxFsObjects + " in the filesystem.");
}
}
/**
* Get the total number of objects in the system.
*/
long getMaxObjects() {
return maxFsObjects;
}
public long getFilesAndDirectoriesTotal() {
return this.dir.totalInodes();
}
public long getFilesTotal() {
return this.dir.totalFiles();
}
public long getDiskSpaceTotal() {
return this.dir.totalDiskSpace();
}
public long getPendingReplicationBlocks() {
return pendingReplicationBlocksCount;
}
public long getUnderReplicatedBlocks() {
return underReplicatedBlocksCount;
}
/**
* Return number of under-replicatedBlocks excluding missing/corrupt blocks
*/
public long getNonCorruptUnderReplicatedBlocks() {
return neededReplications.getNonCorruptUnderReplicatedBlocksCount();
}
/**
* Returns number of blocks with corrupt replicas
*/
public long getCorruptReplicaBlocks() {
return corruptReplicaBlocksCount;
}
public long getScheduledReplicationBlocks() {
return scheduledReplicationBlocksCount;
}
public long getPendingDeletionBlocks() {
return pendingDeletionBlocksCount;
}
public long getExcessBlocks() {
return excessBlocksCount;
}
public int getBlockCapacity() {
readLock();
try {
return blocksMap.getCapacity();
} finally {
readUnlock();
}
}
public long getNumInvalidFilePathOperations() {
return numInvalidFilePathOperations;
}
public String getFSState() {
return isInSafeMode() ? "safeMode" : "Operational";
}
private ObjectName mbeanName;
private ObjectName versionBeanName;
private ObjectName namenodeMXBeanName;
/**
* Register the FSNamesystem MBean using the name
* "hadoop:service=NameNode,name=FSNamesystemState"
*/
void registerMBean(Configuration conf) {
// We wrap to bypass standard mbean naming convention.
// This wraping can be removed in java 6 as it is more flexible in
// package naming for mbeans and their impl.
StandardMBean bean;
try {
versionBeanName = VersionInfo.registerJMX("NameNode");
myFSMetrics = new FSNamesystemMetrics(conf, this);
bean = new StandardMBean(this, FSNamesystemMBean.class);
mbeanName = MBeanUtil.registerMBean("NameNode", "FSNamesystemState", bean);
} catch (NotCompliantMBeanException e) {
e.printStackTrace();
}
LOG.info("Registered FSNamesystemStatusMBean");
}
/**
* get FSNamesystemMetrics
*/
final public FSNamesystemMetrics getFSNamesystemMetrics() {
return myFSMetrics;
}
/**
* shutdown FSNamesystem
*/
public void shutdown() {
if (mbeanName != null) {
MBeanUtil.unregisterMBean(mbeanName);
}
if (versionBeanName != null) {
MBeanUtil.unregisterMBean(versionBeanName);
}
if (namenodeMXBeanName != null) {
MBeanUtil.unregisterMBean(namenodeMXBeanName);
}
}
/**
* Number of live data nodes
*
* @return Number of live data nodes
*/
public int getNumLiveDataNodes() {
return getDatanodeListForReport(DatanodeReportType.LIVE).size();
}
/**
* Number of dead data nodes
*
* @return Number of dead data nodes
*/
public int getNumDeadDataNodes() {
return getDatanodeListForReport(DatanodeReportType.DEAD).size();
}
/**
* Sets the generation stamp for this filesystem
*/
public void setGenerationStamp(long stamp) {
generationStamp.setStamp(stamp);
}
/**
* Gets the generation stamp for this filesystem
*/
public long getGenerationStamp() {
return generationStamp.getStamp();
}
/**
* Increments, logs and then returns the stamp. This is used only for testing.
*/
public long nextGenerationStampForTesting() {
return nextGenerationStamp();
}
/**
* Increments, logs and then returns the stamp
*/
private long nextGenerationStamp() {
long gs = generationStamp.nextStamp();
getEditLog().logGenerationStamp(gs);
return gs;
}
/**
* Verifies that the block is associated with a file that has a lease.
* Increments, logs and then returns the stamp
*
* @param block block
* @param fromNN if it is for lease recovery initiated by NameNode
* @return a new generation stamp
*/
public long nextGenerationStampForBlock(Block block, boolean fromNN) throws IOException {
writeLock();
try {
if (isInSafeMode()) {
throw new SafeModeException("Cannot get nextGenStamp for " + block, safeMode);
}
Block blockWithWildcardGenstamp = new Block(block.getBlockId());
BlockInfo storedBlock = blocksMap.getStoredBlock(blockWithWildcardGenstamp);
if (storedBlock == null) {
String msg = block + " is already commited, storedBlock == null.";
LOG.info(msg);
throw new BlockAlreadyCommittedException(msg);
}
INodeFile fileINode = storedBlock.getINode();
if (!fileINode.isUnderConstruction()) {
String msg = block + " is already commited, !fileINode.isUnderConstruction().";
LOG.info(msg);
throw new BlockAlreadyCommittedException(msg);
}
// Disallow client-initiated recovery once
// NameNode initiated lease recovery starts
if (!fromNN && HdfsConstants.NN_RECOVERY_LEASEHOLDER.equals(
leaseManager.getLeaseByPath(fileINode.getFullPathName()).getHolder())) {
String msg = block +
"is being recovered by NameNode, ignoring the request from a client";
LOG.info(msg);
throw new IOException(msg);
}
if (!((INodeFileUnderConstruction) fileINode).setLastRecoveryTime(now())) {
String msg = block + " is being recovered, ignoring this request.";
LOG.info(msg);
throw new IOException(msg);
}
return nextGenerationStamp();
} finally {
writeUnlock();
}
}
// rename was successful. If any part of the renamed subtree had
// files that were being written to, update with new filename.
//
void changeLease(String src, String dst, HdfsFileStatus dinfo)
throws IOException {
String overwrite;
String replaceBy;
boolean destinationExisted = true;
if (dinfo == null) {
destinationExisted = false;
}
if (destinationExisted && dinfo.isDir()) {
Path spath = new Path(src);
String srcParent = spath.getParent().toString();
overwrite = Path.SEPARATOR.equals(srcParent) ? srcParent
: srcParent + Path.SEPARATOR;
replaceBy = dst + Path.SEPARATOR;
} else {
overwrite = src;
replaceBy = dst;
}
leaseManager.changeLease(src, dst, overwrite, replaceBy);
}
/**
* Serializes leases.
*/
void saveFilesUnderConstruction(SaveNamespaceContext ctx, DataOutputStream out) throws IOException {
synchronized (leaseManager) {
out.writeInt(leaseManager.countPath()); // write the size
LightWeightLinkedSet<Lease> sortedLeases = leaseManager.getSortedLeases();
Iterator<Lease> itr = sortedLeases.iterator();
while (itr.hasNext()) {
ctx.checkCancelled();
Lease lease = itr.next();
for (String path : lease.getPaths()) {
// verify that path exists in namespace
INode node = dir.getFileINode(path);
if (node == null) {
throw new IOException("saveLeases found path " + path +
" but no matching entry in namespace.");
}
if (!node.isUnderConstruction()) {
throw new IOException("saveLeases found path " + path +
" but is not under construction.");
}
INodeFileUnderConstruction cons = (INodeFileUnderConstruction) node;
FSImageSerialization.writeINodeUnderConstruction(out, cons, path);
}
}
}
}
/*
* @return list of datanodes where decommissioning is in progress
*/
public ArrayList<DatanodeDescriptor> getDecommissioningNodes() {
readLock();
try {
ArrayList<DatanodeDescriptor> decommissioningNodes = new ArrayList<DatanodeDescriptor>();
ArrayList<DatanodeDescriptor> results = getDatanodeListForReport(DatanodeReportType.LIVE);
for (Iterator<DatanodeDescriptor> it = results.iterator(); it.hasNext();) {
DatanodeDescriptor node = it.next();
if (node.isDecommissionInProgress()) {
decommissioningNodes.add(node);
}
}
return decommissioningNodes;
} finally {
readUnlock();
}
}
/**
* Return an iterator over the set of blocks for which there are no replicas.
*/
BlockIterator getCorruptReplicaBlockIterator() {
return neededReplications
.iterator(UnderReplicatedBlocks.QUEUE_WITH_CORRUPT_BLOCKS);
}
public static class CorruptFileBlockInfo {
String path;
Block block;
public CorruptFileBlockInfo(String p, Block b) {
path = p;
block = b;
}
public String toString() {
return block.getBlockName() + "\t" + path;
}
public String getPath() {
return path;
}
}
/**
* @return Minutes in upgrade time
*/
public int getUpgradeTime() {
if (0 == upgradeStartTime) {
return 0;
}
long curTime = now();
if (curTime <= upgradeStartTime) {
return 0;
}
return (int) ((curTime - upgradeStartTime) / (1000 * 60));
}
public void setUpgradeStartTime(final long startTime) {
upgradeStartTime = startTime;
}
/**
* @param path Restrict corrupt files to this portion of namespace.
* @param startBlockAfter Support for continuation; the set of files we return
* back is ordered by blockid; startBlockAfter tells where to start from
* @return a list in which each entry describes a corrupt file/block
* @throws AccessControlException
* @throws IOException
*/
Collection<CorruptFileBlockInfo>
listCorruptFileBlocks(String path,
String[] cookieTab)
throws IOException {
return listCorruptFileBlocks(path, cookieTab, false);
}
/**
* @param path Restrict corrupt files to this portion of namespace.
* @param startBlockAfter Support for continuation; the set of files we return
* back is ordered by blockid; startBlockAfter tells where to start from
* @param decommissioningOnly if set the blocks returned will be the ones that
* only have replicas on the nodes that are being decommissioned
* @return a list in which each entry describes a corrupt file/block
* @throws AccessControlException
* @throws IOException
*/
Collection<CorruptFileBlockInfo>
listCorruptFileBlocks(String path,
String[] cookieTab,
boolean decommissioningOnly)
throws IOException {
readLock();
synchronized (neededReplications) {
try {
if (!isPopulatingReplQueues()) {
throw new IOException("Cannot run listCorruptFileBlocks because "
+ "replication queues have not been initialized.");
}
checkSuperuserPrivilege();
// print a limited # of corrupt files per call
int count = 0;
ArrayList<CorruptFileBlockInfo> corruptFiles =
new ArrayList<CorruptFileBlockInfo>();
BlockIterator blkIterator = null;
if (decommissioningOnly) {
blkIterator = neededReplications.iterator(0);
} else {
blkIterator = getCorruptReplicaBlockIterator();
}
if (cookieTab == null) {
cookieTab = new String[] { null };
}
int skip = getIntCookie(cookieTab[0]);
for(int i = 0; i < skip && blkIterator.hasNext(); i++) {
blkIterator.next();
}
while (blkIterator.hasNext()) {
Block blk = blkIterator.next();
INode inode = blocksMap.getINode(blk);
skip++;
if (inode != null) {
String src = FSDirectory.getFullPathName(inode);
if (src.startsWith(path)) {
NumberReplicas num = countNodes(blk);
if (num.liveReplicas == 0) {
if (decommissioningOnly && num.decommissionedReplicas > 0 ||
!decommissioningOnly && num.decommissionedReplicas == 0) {
corruptFiles.add(new CorruptFileBlockInfo(src, blk));
count++;
if (count >= maxCorruptFilesReturned)
break;
}
}
}
}
}
cookieTab[0] = String.valueOf(skip);
LOG.info("list corrupt file blocks under " + path + ": " + count);
return corruptFiles;
} finally {
readUnlock();
}
}
}
public static int getIntCookie(String cookie){
int c;
if(cookie == null){
c = 0;
} else {
try{
c = Integer.parseInt(cookie);
}catch (NumberFormatException e) {
c = 0;
}
}
c = Math.max(0, c);
return c;
}
void setPersistBlocks(boolean persistBlocks) {
this.persistBlocks = persistBlocks;
}
boolean getPersistBlocks() {
return persistBlocks;
}
void setPermissionAuditLog(boolean permissionAuditOnly) {
this.permissionAuditOnly = permissionAuditOnly;
}
boolean getPermissionAuditLog() {
return permissionAuditOnly;
}
/**
* for debugging
*/
String getBlockPlacementPolicyClassName() {
String name = replicator.getClass().getCanonicalName();
return name;
}
/**
* {@inheritDoc}
*/
@Override
public void reconfigurePropertyImpl(String property, String newVal)
throws ReconfigurationException {
if (property.equals("dfs.block.replicator.classname")) {
try {
writeLock();
Configuration replConf = new Configuration(getConf());
if (newVal == null) {
replConf.unset(property);
} else {
replConf.set(property, newVal);
}
replicator =
BlockPlacementPolicy.getInstance(replConf, this, clusterMap,
hostsReader, dnsToSwitchMapping, this);
} finally {
writeUnlock();
}
LOG.info("RECONFIGURE* changed block placement policy to " +
getBlockPlacementPolicyClassName());
} else if (property.equals("dfs.persist.blocks")) {
try {
writeLock();
if (newVal == null) {
// set to default
setPersistBlocks(false);
} else if (newVal.equals("true")) {
setPersistBlocks(true);
} else if (newVal.equals("false")) {
setPersistBlocks(false);
} else {
throw new ReconfigurationException(property, newVal,
getConf().get(property));
}
LOG.info("RECONFIGURE* changed persist blocks to " +
getPersistBlocks());
} finally {
writeUnlock();
}
} else if (property.equals("dfs.permissions.audit.log")) {
try {
writeLock();
if (newVal == null) {
// set to default
setPermissionAuditLog(false);
} else if (newVal.equals("true")) {
setPermissionAuditLog(true);
} else if (newVal.equals("false")) {
setPermissionAuditLog(false);
} else {
throw new ReconfigurationException(property, newVal,
getConf().get(property));
}
LOG.info("RECONFIGURE* changed permission audit log to " +
getPermissionAuditLog());
} finally {
writeUnlock();
}
} else if (property.equals("dfs.heartbeat.interval")) {
writeLock();
try {
if (newVal == null) {
// set to default
setHeartbeatInterval(3L * 1000L, this.heartbeatRecheckInterval);
} else {
setHeartbeatInterval(Long.valueOf(newVal) * 1000L,
this.heartbeatRecheckInterval);
}
} catch (NumberFormatException e) {
throw new ReconfigurationException(property, newVal,
getConf().get(property));
} finally {
writeUnlock();
}
LOG.info("RECONFIGURE* changed heartbeatInterval to " +
this.heartbeatInterval);
} else if (property.equals("heartbeat.recheck.interval")) {
try {
writeLock();
if (newVal == null) {
// set to default
setHeartbeatInterval(this.heartbeatInterval, 5 * 60 * 1000);
} else {
setHeartbeatInterval(this.heartbeatInterval, Integer.valueOf(newVal));
}
} catch (NumberFormatException e) {
throw new ReconfigurationException(property, newVal,
getConf().get(property));
} finally {
writeUnlock();
}
LOG.info("RECONFIGURE* changed heartbeatRecheckInterval to " +
this.heartbeatRecheckInterval);
} else if (property.equals("dfs.access.time.precision")) {
try {
writeLock();
if (newVal == null) {
this.accessTimePrecision = 3600L;
} else {
this.accessTimePrecision = Long.parseLong(newVal);
}
} catch (NumberFormatException e) {
throw new ReconfigurationException(property, newVal,
getConf().get(property));
} finally {
writeUnlock();
}
LOG.info("RECONFIGURE* changed access time precision to " +
this.accessTimePrecision);
} else if (property.equals("dfs.close.replication.min")) {
try {
writeLock();
if (newVal == null) {
this.minCloseReplication = this.minReplication;
} else {
int newCloseMinReplication = Integer.parseInt(newVal);
if (newCloseMinReplication < minReplication ||
newCloseMinReplication > maxReplication) {
throw new ReconfigurationException(
property, newVal, getConf().get(property));
}
}
} catch (NumberFormatException e) {
throw new ReconfigurationException(property, newVal,
getConf().get(property));
} finally {
writeUnlock();
}
LOG.info("RECONFIGURE* changed new close min replication to " +
this.minCloseReplication);
} else if (property.equals("dfs.max-repl-streams")) {
try {
writeLock();
if (newVal == null) {
this.maxReplicationStreams = 2;
} else {
this.maxReplicationStreams = Integer.parseInt(newVal);
}
} catch (NumberFormatException e) {
throw new ReconfigurationException(property, newVal,
getConf().get(property));
} finally {
writeUnlock();
}
LOG.info("RECONFIGURE* changed max replication streams to " +
this.maxReplicationStreams);
} else if (property.equals("dfs.replication.iteration.multiplier")) {
try {
writeLock();
if (newVal == null) {
this.replicationWorkMultiplier =
UnderReplicationMonitor.REPLICATION_WORK_MULTIPLIER_PER_ITERATION;
} else {
this.replicationWorkMultiplier = Float.parseFloat(newVal);
}
} catch (NumberFormatException e) {
throw new ReconfigurationException(property, newVal,
getConf().get(property));
} finally {
writeUnlock();
}
LOG.info("RECONFIGURE* changed replication work multiplier to " +
this.replicationWorkMultiplier);
} else {
throw new ReconfigurationException(property, newVal,
getConf().get(property));
}
}
/**
* {@inheritDoc}
*/
@Override
public List<String> getReconfigurableProperties() {
ArrayList<String> propertyList = new ArrayList<String>();
propertyList.add("dfs.block.replicator.classname");
propertyList.add("dfs.persist.blocks");
propertyList.add("dfs.permissions.audit.log");
propertyList.add("dfs.heartbeat.interval");
propertyList.add("heartbeat.recheck.interval");
propertyList.add("dfs.access.time.precision");
propertyList.add("dfs.close.replication.min");
propertyList.add("dfs.max-repl-streams");
propertyList.add("dfs.replication.iteration.multiplier");
return propertyList;
}
private static class ReplicationWork {
private Block block;
private long blockSize;
private INodeFile fileINode;
private int numOfReplicas;
private DatanodeDescriptor srcNode;
private List<DatanodeDescriptor> containingNodes;
private DatanodeDescriptor targets[];
private int priority;
public ReplicationWork(Block block,
INodeFile fileINode,
int numOfReplicas,
DatanodeDescriptor srcNode,
List<DatanodeDescriptor> containingNodes,
int priority){
this.block = block;
this.blockSize = block.getNumBytes();
this.fileINode = fileINode;
this.numOfReplicas = numOfReplicas;
this.srcNode = srcNode;
this.containingNodes = containingNodes;
this.priority = priority;
this.targets = null;
}
}
/**
* Register NameNodeMXBean
*/
private void registerMXBean() {
this.namenodeMXBeanName = MBeanUtil.registerMBean("NameNode", "NameNodeInfo", this);
}
/**
* Class representing Namenode information for JMX interfaces
*/
@Override // NameNodeMXBean
public String getVersion() {
return VersionInfo.getVersion();
}
@Override // NameNodeMXBean
public long getUsed() {
return this.getCapacityUsed();
}
@Override // NameNodeMXBean
public long getFree() {
return this.getCapacityRemaining();
}
@Override // NameNodeMXBean
public long getTotal() {
return this.getCapacityTotal();
}
@Override // NameNodeMXBean
public String getSafemode() {
if (!this.isInSafeMode())
return "";
return "Safe mode is ON." + this.getSafeModeTip();
}
@Override // NameNodeMXBean
public boolean isUpgradeFinalized() {
return this.getFSImage().isUpgradeFinalized();
}
@Override // NameNodeMXBean
public long getNonDfsUsedSpace() {
return getCapacityUsedNonDFS();
}
@Override // NameNodeMXBean
public float getPercentUsed() {
return getCapacityUsedPercent();
}
@Override // NameNodeMXBean
public long getNamespaceUsed() {
return this.getCapacityNamespaceUsed();
}
@Override // NameNodeMXBean
public float getPercentNamespaceUsed() {
return this.getCapacityNamespaceUsedPercent();
}
@Override // NameNodeMXBean
public float getPercentRemaining() {
return getCapacityRemainingPercent();
}
@Override // NameNodeMXBean
public long getTotalBlocks() {
return getBlocksTotal();
}
@Override // NameNodeMXBean
public long getTotalFiles() {
return getFilesTotal();
}
@Override // NameNodeMXBean
public long getNumberOfMissingBlocks() {
return getMissingBlocksCount();
}
@Override // NameNodeMXBean
public int getThreads() {
return ManagementFactory.getThreadMXBean().getThreadCount();
}
/**
* Returned information is a JSON representation of map with host name as the
* key and value is a map of live node attribute keys to its values
*/
@Override // NameNodeMXBean
public String getLiveNodes() {
final Map<String, Map<String,Object>> info =
new HashMap<String, Map<String,Object>>();
final ArrayList<DatanodeDescriptor> liveNodeList =
new ArrayList<DatanodeDescriptor>();
final ArrayList<DatanodeDescriptor> deadNodeList =
new ArrayList<DatanodeDescriptor>();
DFSNodesStatus(liveNodeList, deadNodeList);
removeDecommissionedNodeFromList(liveNodeList);
for (DatanodeDescriptor node : liveNodeList) {
final Map<String, Object> innerinfo = new HashMap<String, Object>();
innerinfo.put("lastContact", getLastContact(node));
innerinfo.put("usedSpace", getDfsUsed(node));
innerinfo.put("adminState", node.getAdminState().toString());
innerinfo.put("excluded", this.inExcludedHostsList(node, null));
info.put(node.getHostName() + ":" + node.getPort(), innerinfo);
}
return JSON.toString(info);
}
/**
* Returned information is a JSON representation of map with host name as the
* key and value is a map of dead node attribute keys to its values
*/
@Override // NameNodeMXBean
public String getDeadNodes() {
final Map<String, Map<String, Object>> info =
new HashMap<String, Map<String, Object>>();
final ArrayList<DatanodeDescriptor> liveNodeList =
new ArrayList<DatanodeDescriptor>();
final ArrayList<DatanodeDescriptor> deadNodeList =
new ArrayList<DatanodeDescriptor>();
// we need to call DFSNodeStatus to filter out the dead data nodes
DFSNodesStatus(liveNodeList, deadNodeList);
removeDecommissionedNodeFromList(deadNodeList);
for (DatanodeDescriptor node : deadNodeList) {
final Map<String, Object> innerinfo = new HashMap<String, Object>();
innerinfo.put("lastContact", getLastContact(node));
innerinfo.put("decommissioned", node.isDecommissioned());
innerinfo.put("excluded", this.inExcludedHostsList(node, null));
info.put(node.getHostName() + ":" + node.getPort(), innerinfo);
}
return JSON.toString(info);
}
/**
* Returned information is a JSON representation of map with host name as the
* key and value is a map of decomisioning node attribute keys to its values
*/
@Override // NameNodeMXBean
public String getDecomNodes() {
final Map<String, Map<String, Object>> info =
new HashMap<String, Map<String, Object>>();
final ArrayList<DatanodeDescriptor> decomNodeList =
this.getDecommissioningNodes();
for (DatanodeDescriptor node : decomNodeList) {
final Map<String, Object> innerinfo = new HashMap<String, Object>();
innerinfo.put("underReplicatedBlocks", node.decommissioningStatus
.getUnderReplicatedBlocks());
innerinfo.put("decommissionOnlyReplicas", node.decommissioningStatus
.getDecommissionOnlyReplicas());
innerinfo.put("underReplicateInOpenFiles", node.decommissioningStatus
.getUnderReplicatedInOpenFiles());
info.put(node.getHostName() + ":" + node.getPort(), innerinfo);
}
return JSON.toString(info);
}
private long getLastContact(DatanodeDescriptor alivenode) {
return (System.currentTimeMillis() - alivenode.getLastUpdate())/1000;
}
private long getDfsUsed(DatanodeDescriptor alivenode) {
return alivenode.getDfsUsed();
}
@Override // NameNodeMXBean
public int getNamespaceId() {
return getNamespaceInfo().getNamespaceID();
}
@Override // NameNodeMXBean
public String getNameserviceId() {
return getNameNode().getNameserviceID();
}
@Override //NameNodeMXBean
public String getSafeModeText() {
if (!this.isInSafeMode())
return "";
return "Safe mode is ON. <em>" + this.getSafeModeTip() + "</em><br>";
}
@Override // NameNodeMXBean
public Map<NameNodeKey, String> getNNSpecificKeys() {
return getNameNode().getNameNodeSpecificKeys();
}
public Map<String, String> getJsonFriendlyNNSpecificKeys() {
Map<String, String> clone = new HashMap<String, String>();
Map<NameNodeKey, String> original = this.getNNSpecificKeys();
for (NameNodeKey nnk : original.keySet()) {
clone.put(nnk.toString(), original.get(nnk));
}
return clone;
}
@Override // NameNodeMXBean
public boolean getIsPrimary() {
return getNameNode().getIsPrimary();
}
public String getNameNodeStatus() {
Map<String, Object> result = new HashMap<String, Object>();
result.put(ClusterJspHelper.TOTAL_FILES,
Long.toString(this.getTotalFiles()));
result.put(ClusterJspHelper.TOTAL, Long.toString(this.getTotal()));
result.put(ClusterJspHelper.FREE, Long.toString(this.getFree()));
result.put(ClusterJspHelper.NAMESPACE_USED,
Long.toString(this.getNamespaceUsed()));
result.put(ClusterJspHelper.NON_DFS_USEDSPACE,
Long.toString(this.getNonDfsUsedSpace()));
result.put(ClusterJspHelper.TOTAL_BLOCKS,
Long.toString(this.getTotalBlocks()));
result.put(ClusterJspHelper.NUMBER_MISSING_BLOCKS,
Long.toString(this.getNumberOfMissingBlocks()));
result.put(ClusterJspHelper.SAFE_MODE_TEXT, this.getSafeModeText());
result.put(ClusterJspHelper.LIVE_NODES, this.getLiveNodes());
result.put(ClusterJspHelper.DEAD_NODES, this.getDeadNodes());
result.put(ClusterJspHelper.DECOM_NODES, this.getDecomNodes());
result.put(ClusterJspHelper.NNSPECIFIC_KEYS,
JSON.toString(this.getJsonFriendlyNNSpecificKeys()));
result.put(ClusterJspHelper.IS_PRIMARY,
Boolean.toString(this.getIsPrimary()));
return JSON.toString(result);
}
/**
* Remove an already decommissioned data node who is neither in include nor
* exclude hosts lists from the the list of live or dead nodes. This is used
* to not display an already decommssioned data node to the operators.
* The operation procedure of making a already decommissioned data node not
* to be displayed is as following:
* <ol>
* <li>
* Host must have been in the include hosts list and the include hosts list
* must not be empty.
* </li>
* <li>
* Host is decommissioned by remaining in the include hosts list and added
* into the exclude hosts list. Name node is updated with the new
* information by issuing dfsadmin -refreshNodes command.
* </li>
* <li>
* Host is removed from both include hosts and exclude hosts lists. Name
* node is updated with the new informationby issuing dfsamin -refreshNodes
* command.
* <li>
* </ol>
*
* @param nodeList
* , array list of live or dead nodes.
*/
void removeDecommissionedNodeFromList(ArrayList<DatanodeDescriptor> nodeList) {
// If the include list is empty, any nodes are welcomed and it does not
// make sense to exclude any nodes from the cluster. Therefore, no remove.
if (hostsReader.getHosts().isEmpty()) {
return;
}
for (Iterator<DatanodeDescriptor> it = nodeList.iterator(); it.hasNext();) {
DatanodeDescriptor node = it.next();
if ((!inHostsList(node, null)) && (!inExcludedHostsList(node, null))
&& node.isDecommissioned()) {
// Include list is not empty, an existing datanode does not appear
// in both include or exclude lists and it has been decommissioned.
// Remove it from the node list.
it.remove();
}
}
}
public void cancelSaveNamespace(String reason) {
this.dir.fsImage.cancelSaveNamespace(reason);
}
public HostsFileReader getHostReader() {
return this.hostsReader;
}
public int getReportingNodes() {
return this.dnReporting;
}
static final UserGroupInformation getCurrentUGI() {
UserGroupInformation ugi = Server.getCurrentUGI();
if (ugi == null)
ugi = UserGroupInformation.getCurrentUGI();
return ugi;
}
private INode getLastINode(INode[] nodes) {
if (nodes == null || nodes.length == 0)
return null;
return nodes[nodes.length-1];
}
/**
* Clamp the specified replication between the minimum and the maximum
* replication levels.
*/
public short adjustReplication(short replication) {
short r = (short) (replication < minReplication? minReplication
: replication > maxReplication? maxReplication: replication);
return r;
}
/** Re-populate the namespace and diskspace count of every node with quota */
void recount() {
writeLock();
try {
dir.updateCountForINodeWithQuota();
} finally {
writeUnlock();
}
}
}