/**
* 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.mapred;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.InputStreamReader;
import java.io.Writer;
import java.net.BindException;
import java.net.InetSocketAddress;
import java.net.UnknownHostException;
import java.security.PrivilegedExceptionAction;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.Date;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.Set;
import java.util.TreeMap;
import java.util.TreeSet;
import java.util.Vector;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.CopyOnWriteArrayList;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.CommonConfigurationKeys;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.LocalFileSystem;
import org.apache.hadoop.fs.LocalDirAllocator;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.permission.FsPermission;
import org.apache.hadoop.mapred.JobSubmissionProtocol;
import org.apache.hadoop.mapreduce.security.token.delegation.DelegationTokenIdentifier;
import org.apache.hadoop.mapreduce.security.token.delegation.DelegationTokenSecretManager;
import org.apache.hadoop.http.HttpServer;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.ipc.RPC;
import org.apache.hadoop.ipc.Server;
import org.apache.hadoop.ipc.RPC.VersionMismatch;
import org.apache.hadoop.mapred.AuditLogger.Constants;
import org.apache.hadoop.mapred.JobHistory.Keys;
import org.apache.hadoop.mapred.JobHistory.Listener;
import org.apache.hadoop.mapred.JobHistory.Values;
import org.apache.hadoop.mapred.JobInProgress.KillInterruptedException;
import org.apache.hadoop.mapred.JobStatusChangeEvent.EventType;
import org.apache.hadoop.mapred.QueueManager.QueueACL;
import org.apache.hadoop.mapred.TaskTrackerStatus.TaskTrackerHealthStatus;
import org.apache.hadoop.net.DNSToSwitchMapping;
import org.apache.hadoop.net.NetUtils;
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.security.AccessControlException;
import org.apache.hadoop.security.Groups;
import org.apache.hadoop.security.RefreshUserMappingsProtocol;
import org.apache.hadoop.security.SecurityUtil;
import org.apache.hadoop.security.UserGroupInformation;
import org.apache.hadoop.security.UserGroupInformation.AuthenticationMethod;
import org.apache.hadoop.security.authorize.AccessControlList;
import org.apache.hadoop.security.authorize.AuthorizationException;
import org.apache.hadoop.security.authorize.ProxyUsers;
import org.apache.hadoop.security.authorize.RefreshAuthorizationPolicyProtocol;
import org.apache.hadoop.security.token.Token;
import org.apache.hadoop.util.HostsFileReader;
import org.apache.hadoop.util.MRAsyncDiskService;
import org.apache.hadoop.util.PluginDispatcher;
import org.apache.hadoop.util.ReflectionUtils;
import org.apache.hadoop.util.StringUtils;
import org.apache.hadoop.util.VersionInfo;
import org.apache.hadoop.mapreduce.ClusterMetrics;
import org.apache.hadoop.mapreduce.TaskType;
import org.apache.hadoop.mapreduce.security.token.DelegationTokenRenewal;
import org.apache.hadoop.mapreduce.security.token.JobTokenSecretManager;
import org.apache.hadoop.mapreduce.server.jobtracker.TaskTracker;
import org.apache.hadoop.security.Credentials;
/*******************************************************
* JobTracker is the central location for submitting and
* tracking MR jobs in a network environment.
*
*******************************************************/
public class JobTracker implements MRConstants, InterTrackerProtocol,
JobSubmissionProtocol, TaskTrackerManager, RefreshUserMappingsProtocol,
RefreshAuthorizationPolicyProtocol, AdminOperationsProtocol {
static{
Configuration.addDefaultResource("mapred-default.xml");
Configuration.addDefaultResource("mapred-site.xml");
}
static long TASKTRACKER_EXPIRY_INTERVAL = 10 * 60 * 1000;
static long RETIRE_JOB_INTERVAL;
static long RETIRE_JOB_CHECK_INTERVAL;
private final long DELEGATION_TOKEN_GC_INTERVAL = 3600000; // 1 hour
private final DelegationTokenSecretManager secretManager;
// The interval after which one fault of a tracker will be discarded,
// if there are no faults during this.
private static long UPDATE_FAULTY_TRACKER_INTERVAL = 24 * 60 * 60 * 1000;
// The maximum percentage of trackers in cluster added
// to the 'blacklist' across all the jobs.
private static double MAX_BLACKLIST_PERCENT = 0.50;
// A tracker is blacklisted across jobs only if number of
// blacklists are X% above the average number of blacklists.
// X is the blacklist threshold here.
private double AVERAGE_BLACKLIST_THRESHOLD = 0.50;
// The maximum number of blacklists for a tracker after which the
// tracker could be blacklisted across all jobs
private int MAX_BLACKLISTS_PER_TRACKER = 4;
//Delegation token related keys
public static final String DELEGATION_KEY_UPDATE_INTERVAL_KEY =
"mapreduce.cluster.delegation.key.update-interval";
public static final long DELEGATION_KEY_UPDATE_INTERVAL_DEFAULT =
24*60*60*1000; // 1 day
public static final String DELEGATION_TOKEN_RENEW_INTERVAL_KEY =
"mapreduce.cluster.delegation.token.renew-interval";
public static final long DELEGATION_TOKEN_RENEW_INTERVAL_DEFAULT =
24*60*60*1000; // 1 day
public static final String DELEGATION_TOKEN_MAX_LIFETIME_KEY =
"mapreduce.cluster.delegation.token.max-lifetime";
public static final long DELEGATION_TOKEN_MAX_LIFETIME_DEFAULT =
7*24*60*60*1000; // 7 days
// Approximate number of heartbeats that could arrive JobTracker
// in a second
static final String JT_HEARTBEATS_IN_SECOND = "mapred.heartbeats.in.second";
private int NUM_HEARTBEATS_IN_SECOND;
private static final int DEFAULT_NUM_HEARTBEATS_IN_SECOND = 100;
private static final int MIN_NUM_HEARTBEATS_IN_SECOND = 1;
// Scaling factor for heartbeats, used for testing only
static final String JT_HEARTBEATS_SCALING_FACTOR =
"mapreduce.jobtracker.heartbeats.scaling.factor";
private float HEARTBEATS_SCALING_FACTOR;
private final float MIN_HEARTBEATS_SCALING_FACTOR = 0.01f;
private final float DEFAULT_HEARTBEATS_SCALING_FACTOR = 1.0f;
public static enum State { INITIALIZING, RUNNING }
State state = State.INITIALIZING;
private static final int FS_ACCESS_RETRY_PERIOD = 10000;
static final String JOB_INFO_FILE = "job-info";
private DNSToSwitchMapping dnsToSwitchMapping;
private NetworkTopology clusterMap = new NetworkTopology();
private int numTaskCacheLevels; // the max level to which we cache tasks
/**
* {@link #nodesAtMaxLevel} is using the keySet from {@link ConcurrentHashMap}
* so that it can be safely written to and iterated on via 2 separate threads.
* Note: It can only be iterated from a single thread which is feasible since
* the only iteration is done in {@link JobInProgress} under the
* {@link JobTracker} lock.
*/
private Set<Node> nodesAtMaxLevel =
Collections.newSetFromMap(new ConcurrentHashMap<Node, Boolean>());
private final TaskScheduler taskScheduler;
private final List<JobInProgressListener> jobInProgressListeners =
new CopyOnWriteArrayList<JobInProgressListener>();
private static final LocalDirAllocator lDirAlloc =
new LocalDirAllocator("mapred.local.dir");
//system directory is completely owned by the JobTracker
final static FsPermission SYSTEM_DIR_PERMISSION =
FsPermission.createImmutable((short) 0700); // rwx------
// system files should have 700 permission
final static FsPermission SYSTEM_FILE_PERMISSION =
FsPermission.createImmutable((short) 0700); // rwx------
private Clock clock;
private MRAsyncDiskService asyncDiskService;
private final JobTokenSecretManager jobTokenSecretManager
= new JobTokenSecretManager();
JobTokenSecretManager getJobTokenSecretManager() {
return jobTokenSecretManager;
}
/**
* A client tried to submit a job before the Job Tracker was ready.
*/
public static class IllegalStateException extends IOException {
private static final long serialVersionUID = 1L;
public IllegalStateException(String msg) {
super(msg);
}
}
/**
* The maximum no. of 'completed' (successful/failed/killed)
* jobs kept in memory per-user.
*/
final int MAX_COMPLETE_USER_JOBS_IN_MEMORY;
/**
* The minimum time (in ms) that a job's information has to remain
* in the JobTracker's memory before it is retired.
*/
static final int MIN_TIME_BEFORE_RETIRE = 0;
private int nextJobId = 1;
public static final Log LOG = LogFactory.getLog(JobTracker.class);
private PluginDispatcher<JobTrackerPlugin> pluginDispatcher;
public Clock getClock() {
return clock;
}
/**
* Start the JobTracker with given configuration.
*
* The conf will be modified to reflect the actual ports on which
* the JobTracker is up and running if the user passes the port as
* <code>zero</code>.
*
* @param conf configuration for the JobTracker.
* @throws IOException
*/
public static JobTracker startTracker(JobConf conf
) throws IOException,
InterruptedException {
return startTracker(conf, generateNewIdentifier());
}
public static JobTracker startTracker(JobConf conf, String identifier)
throws IOException, InterruptedException {
JobTracker result = null;
while (true) {
try {
result = new JobTracker(conf, identifier);
result.taskScheduler.setTaskTrackerManager(result);
break;
} catch (VersionMismatch e) {
throw e;
} catch (BindException e) {
throw e;
} catch (UnknownHostException e) {
throw e;
} catch (AccessControlException ace) {
// in case of jobtracker not having right access
// bail out
throw ace;
} catch (IOException e) {
LOG.warn("Error starting tracker: " +
StringUtils.stringifyException(e));
}
Thread.sleep(1000);
}
if (result != null) {
JobEndNotifier.startNotifier();
}
return result;
}
public void stopTracker() throws IOException {
JobEndNotifier.stopNotifier();
close();
}
public long getProtocolVersion(String protocol,
long clientVersion) throws IOException {
if (protocol.equals(InterTrackerProtocol.class.getName())) {
return InterTrackerProtocol.versionID;
} else if (protocol.equals(JobSubmissionProtocol.class.getName())){
return JobSubmissionProtocol.versionID;
} else if (protocol.equals(RefreshAuthorizationPolicyProtocol.class.getName())){
return RefreshAuthorizationPolicyProtocol.versionID;
} else if (protocol.equals(AdminOperationsProtocol.class.getName())){
return AdminOperationsProtocol.versionID;
} else if (protocol.equals(RefreshUserMappingsProtocol.class.getName())){
return RefreshUserMappingsProtocol.versionID;
} else {
throw new IOException("Unknown protocol to job tracker: " + protocol);
}
}
public DelegationTokenSecretManager getDelegationTokenSecretManager() {
return secretManager;
}
/**
* A thread to timeout tasks that have been assigned to task trackers,
* but that haven't reported back yet.
* Note that I included a stop() method, even though there is no place
* where JobTrackers are cleaned up.
*/
private class ExpireLaunchingTasks implements Runnable {
/**
* This is a map of the tasks that have been assigned to task trackers,
* but that have not yet been seen in a status report.
* map: task-id -> time-assigned
*/
private Map<TaskAttemptID, Long> launchingTasks =
new LinkedHashMap<TaskAttemptID, Long>();
public void run() {
while (true) {
try {
// Every 3 minutes check for any tasks that are overdue
Thread.sleep(TASKTRACKER_EXPIRY_INTERVAL/3);
long now = clock.getTime();
if(LOG.isDebugEnabled()) {
LOG.debug("Starting launching task sweep");
}
synchronized (JobTracker.this) {
synchronized (launchingTasks) {
Iterator<Map.Entry<TaskAttemptID, Long>> itr =
launchingTasks.entrySet().iterator();
while (itr.hasNext()) {
Map.Entry<TaskAttemptID, Long> pair = itr.next();
TaskAttemptID taskId = pair.getKey();
long age = now - (pair.getValue()).longValue();
LOG.info(taskId + " is " + age + " ms debug.");
if (age > TASKTRACKER_EXPIRY_INTERVAL) {
LOG.info("Launching task " + taskId + " timed out.");
TaskInProgress tip = null;
tip = taskidToTIPMap.get(taskId);
if (tip != null) {
JobInProgress job = tip.getJob();
String trackerName = getAssignedTracker(taskId);
TaskTrackerStatus trackerStatus =
getTaskTrackerStatus(trackerName);
// This might happen when the tasktracker has already
// expired and this thread tries to call failedtask
// again. expire tasktracker should have called failed
// task!
if (trackerStatus != null)
job.failedTask(tip, taskId, "Error launching task",
tip.isMapTask()? TaskStatus.Phase.MAP:
TaskStatus.Phase.STARTING,
TaskStatus.State.FAILED,
trackerName);
}
itr.remove();
} else {
// the tasks are sorted by start time, so once we find
// one that we want to keep, we are done for this cycle.
break;
}
}
}
}
} catch (InterruptedException ie) {
// all done
break;
} catch (Exception e) {
LOG.error("Expire Launching Task Thread got exception: " +
StringUtils.stringifyException(e));
}
}
}
public void addNewTask(TaskAttemptID taskName) {
synchronized (launchingTasks) {
launchingTasks.put(taskName,
clock.getTime());
}
}
public void removeTask(TaskAttemptID taskName) {
synchronized (launchingTasks) {
launchingTasks.remove(taskName);
}
}
}
///////////////////////////////////////////////////////
// Used to expire TaskTrackers that have gone down
///////////////////////////////////////////////////////
class ExpireTrackers implements Runnable {
public ExpireTrackers() {
}
/**
* The run method lives for the life of the JobTracker, and removes TaskTrackers
* that have not checked in for some time.
*/
public void run() {
while (true) {
try {
//
// Thread runs periodically to check whether trackers should be expired.
// The sleep interval must be no more than half the maximum expiry time
// for a task tracker.
//
Thread.sleep(TASKTRACKER_EXPIRY_INTERVAL / 3);
//
// Loop through all expired items in the queue
//
// Need to lock the JobTracker here since we are
// manipulating it's data-structures via
// ExpireTrackers.run -> JobTracker.lostTaskTracker ->
// JobInProgress.failedTask -> JobTracker.markCompleteTaskAttempt
// Also need to lock JobTracker before locking 'taskTracker' &
// 'trackerExpiryQueue' to prevent deadlock:
// @see {@link JobTracker.processHeartbeat(TaskTrackerStatus, boolean)}
synchronized (JobTracker.this) {
synchronized (taskTrackers) {
synchronized (trackerExpiryQueue) {
long now = clock.getTime();
TaskTrackerStatus leastRecent = null;
while ((trackerExpiryQueue.size() > 0) &&
(leastRecent = trackerExpiryQueue.first()) != null &&
((now - leastRecent.getLastSeen()) > TASKTRACKER_EXPIRY_INTERVAL)) {
// Remove profile from head of queue
trackerExpiryQueue.remove(leastRecent);
String trackerName = leastRecent.getTrackerName();
// Figure out if last-seen time should be updated, or if tracker is dead
TaskTracker current = getTaskTracker(trackerName);
TaskTrackerStatus newProfile =
(current == null ) ? null : current.getStatus();
// Items might leave the taskTracker set through other means; the
// status stored in 'taskTrackers' might be null, which means the
// tracker has already been destroyed.
if (newProfile != null) {
if ((now - newProfile.getLastSeen()) > TASKTRACKER_EXPIRY_INTERVAL) {
removeTracker(current);
// remove the mapping from the hosts list
String hostname = newProfile.getHost();
hostnameToTaskTracker.get(hostname).remove(trackerName);
} else {
// Update time by inserting latest profile
trackerExpiryQueue.add(newProfile);
}
}
}
}
}
}
} catch (InterruptedException iex) {
break;
} catch (Exception t) {
LOG.error("Tracker Expiry Thread got exception: " +
StringUtils.stringifyException(t));
}
}
}
}
synchronized void historyFileCopied(JobID jobid, String historyFile) {
JobInProgress job = getJob(jobid);
if (job != null) { //found in main cache
job.setHistoryFileCopied();
if (historyFile != null) {
job.setHistoryFile(historyFile);
}
return;
}
RetireJobInfo jobInfo = retireJobs.get(jobid);
if (jobInfo != null) { //found in retired cache
if (historyFile != null) {
jobInfo.setHistoryFile(historyFile);
}
}
}
static class RetireJobInfo {
final JobStatus status;
final JobProfile profile;
final long finishTime;
private String historyFile;
RetireJobInfo(JobStatus status, JobProfile profile, long finishTime,
String historyFile) {
this.status = status;
this.profile = profile;
this.finishTime = finishTime;
this.historyFile = historyFile;
}
void setHistoryFile(String file) {
this.historyFile = file;
}
String getHistoryFile() {
return historyFile;
}
}
///////////////////////////////////////////////////////
// Used to remove old finished Jobs that have been around for too long
///////////////////////////////////////////////////////
class RetireJobs implements Runnable {
private final Map<JobID, RetireJobInfo> jobIDStatusMap =
new HashMap<JobID, RetireJobInfo>();
private final LinkedList<RetireJobInfo> jobRetireInfoQ =
new LinkedList<RetireJobInfo>();
public RetireJobs() {
}
synchronized void addToCache(JobInProgress job) {
RetireJobInfo info = new RetireJobInfo(job.getStatus(),
job.getProfile(), job.getFinishTime(), job.getHistoryFile());
jobRetireInfoQ.add(info);
jobIDStatusMap.put(info.status.getJobID(), info);
if (jobRetireInfoQ.size() > retiredJobsCacheSize) {
RetireJobInfo removed = jobRetireInfoQ.remove();
jobIDStatusMap.remove(removed.status.getJobID());
LOG.info("Retired job removed from cache " + removed.status.getJobID());
}
}
synchronized RetireJobInfo get(JobID jobId) {
return jobIDStatusMap.get(jobId);
}
@SuppressWarnings("unchecked")
synchronized LinkedList<RetireJobInfo> getAll() {
return (LinkedList<RetireJobInfo>) jobRetireInfoQ.clone();
}
synchronized LinkedList<JobStatus> getAllJobStatus() {
LinkedList<JobStatus> list = new LinkedList<JobStatus>();
for (RetireJobInfo info : jobRetireInfoQ) {
list.add(info.status);
}
return list;
}
private boolean minConditionToRetire(JobInProgress job, long now) {
return job.getStatus().getRunState() != JobStatus.RUNNING &&
job.getStatus().getRunState() != JobStatus.PREP &&
(job.getFinishTime() + MIN_TIME_BEFORE_RETIRE < now) &&
job.isHistoryFileCopied();
}
/**
* The run method lives for the life of the JobTracker,
* and removes Jobs that are not still running, but which
* finished a long time ago.
*/
public void run() {
while (true) {
try {
Thread.sleep(RETIRE_JOB_CHECK_INTERVAL);
List<JobInProgress> retiredJobs = new ArrayList<JobInProgress>();
long now = clock.getTime();
long retireBefore = now - RETIRE_JOB_INTERVAL;
synchronized (jobs) {
for(JobInProgress job: jobs.values()) {
if (minConditionToRetire(job, now) &&
(job.getFinishTime() < retireBefore)) {
retiredJobs.add(job);
}
}
}
synchronized (userToJobsMap) {
Iterator<Map.Entry<String, ArrayList<JobInProgress>>>
userToJobsMapIt = userToJobsMap.entrySet().iterator();
while (userToJobsMapIt.hasNext()) {
Map.Entry<String, ArrayList<JobInProgress>> entry =
userToJobsMapIt.next();
ArrayList<JobInProgress> userJobs = entry.getValue();
Iterator<JobInProgress> it = userJobs.iterator();
while (it.hasNext() &&
userJobs.size() > MAX_COMPLETE_USER_JOBS_IN_MEMORY) {
JobInProgress jobUser = it.next();
if (retiredJobs.contains(jobUser)) {
LOG.info("Removing from userToJobsMap: " +
jobUser.getJobID());
it.remove();
} else if (minConditionToRetire(jobUser, now)) {
LOG.info("User limit exceeded. Marking job: " +
jobUser.getJobID() + " for retire.");
retiredJobs.add(jobUser);
it.remove();
}
}
if (userJobs.isEmpty()) {
userToJobsMapIt.remove();
}
}
}
if (!retiredJobs.isEmpty()) {
synchronized (JobTracker.this) {
synchronized (jobs) {
synchronized (taskScheduler) {
for (JobInProgress job: retiredJobs) {
removeJobTasks(job);
jobs.remove(job.getProfile().getJobID());
for (JobInProgressListener l : jobInProgressListeners) {
l.jobRemoved(job);
}
String jobUser = job.getProfile().getUser();
LOG.info("Retired job with id: '" +
job.getProfile().getJobID() + "' of user '" +
jobUser + "'");
// clean up job files from the local disk
JobHistory.JobInfo.cleanupJob(job.getProfile().getJobID());
addToCache(job);
}
}
}
}
}
} catch (InterruptedException t) {
break;
} catch (Throwable t) {
LOG.error("Error in retiring job:\n" +
StringUtils.stringifyException(t));
}
}
}
}
enum ReasonForBlackListing {
EXCEEDING_FAILURES,
NODE_UNHEALTHY
}
// The FaultInfo which indicates the number of faults of a tracker
// and when the last fault occurred
// and whether the tracker is blacklisted across all jobs or not
private static class FaultInfo {
static final String FAULT_FORMAT_STRING = "%d failures on the tracker";
int numFaults = 0;
long lastUpdated;
boolean blacklisted;
private boolean isHealthy;
private HashMap<ReasonForBlackListing, String>rfbMap;
FaultInfo(long time) {
numFaults = 0;
lastUpdated = time;
blacklisted = false;
rfbMap = new HashMap<ReasonForBlackListing, String>();
}
void setFaultCount(int num) {
numFaults = num;
}
void setLastUpdated(long timeStamp) {
lastUpdated = timeStamp;
}
int getFaultCount() {
return numFaults;
}
long getLastUpdated() {
return lastUpdated;
}
boolean isBlacklisted() {
return blacklisted;
}
void setBlacklist(ReasonForBlackListing rfb,
String trackerFaultReport) {
blacklisted = true;
this.rfbMap.put(rfb, trackerFaultReport);
}
public void setHealthy(boolean isHealthy) {
this.isHealthy = isHealthy;
}
public boolean isHealthy() {
return isHealthy;
}
public String getTrackerFaultReport() {
StringBuffer sb = new StringBuffer();
for(String reasons : rfbMap.values()) {
sb.append(reasons);
sb.append("\n");
}
return sb.toString();
}
Set<ReasonForBlackListing> getReasonforblacklisting() {
return this.rfbMap.keySet();
}
public void unBlacklist() {
this.blacklisted = false;
this.rfbMap.clear();
}
public boolean removeBlackListedReason(ReasonForBlackListing rfb) {
String str = rfbMap.remove(rfb);
return str!=null;
}
public void addBlackListedReason(ReasonForBlackListing rfb, String reason) {
this.rfbMap.put(rfb, reason);
}
}
private class FaultyTrackersInfo {
// A map from hostName to its faults
private Map<String, FaultInfo> potentiallyFaultyTrackers =
new HashMap<String, FaultInfo>();
// This count gives the number of blacklisted trackers in the cluster
// at any time. This is maintained to avoid iteration over
// the potentiallyFaultyTrackers to get blacklisted trackers. And also
// this count doesn't include blacklisted trackers which are lost,
// although the fault info is maintained for lost trackers.
private volatile int numBlacklistedTrackers = 0;
/**
* Increments faults(blacklist by job) for the tracker by one.
*
* Adds the tracker to the potentially faulty list.
* Assumes JobTracker is locked on the entry.
*
* @param hostName
*/
void incrementFaults(String hostName) {
synchronized (potentiallyFaultyTrackers) {
FaultInfo fi = getFaultInfo(hostName, true);
int numFaults = fi.getFaultCount();
++numFaults;
fi.setFaultCount(numFaults);
fi.setLastUpdated(clock.getTime());
if (exceedsFaults(fi)) {
LOG.info("Adding " + hostName + " to the blacklist"
+ " across all jobs");
String reason = String.format(FaultInfo.FAULT_FORMAT_STRING,
numFaults);
blackListTracker(hostName, reason,
ReasonForBlackListing.EXCEEDING_FAILURES);
}
}
}
private void incrBlackListedTrackers(int count) {
numBlacklistedTrackers += count;
getInstrumentation().addBlackListedTrackers(count);
}
private void decrBlackListedTrackers(int count) {
numBlacklistedTrackers -= count;
getInstrumentation().decBlackListedTrackers(count);
}
private void blackListTracker(String hostName, String reason, ReasonForBlackListing rfb) {
FaultInfo fi = getFaultInfo(hostName, true);
boolean blackListed = fi.isBlacklisted();
if(blackListed) {
if (LOG.isDebugEnabled()) {
LOG.debug("Adding blacklisted reason for tracker : " + hostName
+ " Reason for blacklisting is : " + rfb);
}
if (!fi.getReasonforblacklisting().contains(rfb)) {
LOG.info("Adding blacklisted reason for tracker : " + hostName
+ " Reason for blacklisting is : " + rfb);
}
fi.addBlackListedReason(rfb, reason);
} else {
LOG.info("Blacklisting tracker : " + hostName
+ " Reason for blacklisting is : " + rfb);
Set<TaskTracker> trackers =
hostnameToTaskTracker.get(hostName);
synchronized (trackers) {
for (TaskTracker tracker : trackers) {
tracker.cancelAllReservations();
}
}
removeHostCapacity(hostName);
fi.setBlacklist(rfb, reason);
}
}
private boolean canUnBlackListTracker(String hostName,
ReasonForBlackListing rfb) {
FaultInfo fi = getFaultInfo(hostName, false);
if(fi == null) {
return false;
}
Set<ReasonForBlackListing> rfbSet = fi.getReasonforblacklisting();
return fi.isBlacklisted() && rfbSet.contains(rfb);
}
private void unBlackListTracker(String hostName,
ReasonForBlackListing rfb) {
// check if you can black list the tracker then call this methods
FaultInfo fi = getFaultInfo(hostName, false);
if(fi.removeBlackListedReason(rfb)) {
if(fi.getReasonforblacklisting().isEmpty()) {
addHostCapacity(hostName);
LOG.info("Unblacklisting tracker : " + hostName);
fi.unBlacklist();
//We have unBlackListed tracker, so tracker should
//definitely be healthy. Check fault count if fault count
//is zero don't keep it memory.
if(fi.numFaults == 0) {
potentiallyFaultyTrackers.remove(hostName);
}
}
}
}
// Assumes JobTracker is locked on the entry
private FaultInfo getFaultInfo(String hostName,
boolean createIfNeccessary) {
FaultInfo fi = null;
synchronized (potentiallyFaultyTrackers) {
fi = potentiallyFaultyTrackers.get(hostName);
if (fi == null && createIfNeccessary) {
fi = new FaultInfo(clock.getTime());
potentiallyFaultyTrackers.put(hostName, fi);
}
}
return fi;
}
/**
* Blacklists the tracker across all jobs if
* <ol>
* <li>#faults are more than
* MAX_BLACKLISTS_PER_TRACKER (configurable) blacklists</li>
* <li>#faults is 50% (configurable) above the average #faults</li>
* <li>50% the cluster is not blacklisted yet </li>
* </ol>
*/
private boolean exceedsFaults(FaultInfo fi) {
int faultCount = fi.getFaultCount();
if (faultCount >= MAX_BLACKLISTS_PER_TRACKER) {
// calculate avgBlackLists
long clusterSize = getClusterStatus().getTaskTrackers();
long sum = 0;
for (FaultInfo f : potentiallyFaultyTrackers.values()) {
sum += f.getFaultCount();
}
double avg = (double) sum / clusterSize;
long totalCluster = clusterSize + numBlacklistedTrackers;
if ((faultCount - avg) > (AVERAGE_BLACKLIST_THRESHOLD * avg) &&
numBlacklistedTrackers < (totalCluster * MAX_BLACKLIST_PERCENT)) {
return true;
}
}
return false;
}
/**
* Removes the tracker from blacklist and
* from potentially faulty list, when it is restarted.
*
* Assumes JobTracker is locked on the entry.
*
* @param hostName
*/
void markTrackerHealthy(String hostName) {
synchronized (potentiallyFaultyTrackers) {
FaultInfo fi = potentiallyFaultyTrackers.remove(hostName);
if (fi != null && fi.isBlacklisted()) {
LOG.info("Removing " + hostName + " from blacklist");
addHostCapacity(hostName);
}
}
}
/**
* Check whether tasks can be assigned to the tracker.
*
* One fault of the tracker is discarded if there
* are no faults during one day. So, the tracker will get a
* chance again to run tasks of a job.
* Assumes JobTracker is locked on the entry.
*
* @param hostName The tracker name
* @param now The current time
*
* @return true if the tracker is blacklisted
* false otherwise
*/
boolean shouldAssignTasksToTracker(String hostName, long now) {
synchronized (potentiallyFaultyTrackers) {
FaultInfo fi = potentiallyFaultyTrackers.get(hostName);
if (fi != null &&
(now - fi.getLastUpdated()) > UPDATE_FAULTY_TRACKER_INTERVAL) {
int numFaults = fi.getFaultCount() - 1;
fi.setFaultCount(numFaults);
fi.setLastUpdated(now);
if (canUnBlackListTracker(hostName,
ReasonForBlackListing.EXCEEDING_FAILURES)) {
unBlackListTracker(hostName,
ReasonForBlackListing.EXCEEDING_FAILURES);
}
}
return (fi != null && fi.isBlacklisted());
}
}
private void removeHostCapacity(String hostName) {
synchronized (taskTrackers) {
// remove the capacity of trackers on this host
int numTrackersOnHost = 0;
for (TaskTrackerStatus status : getStatusesOnHost(hostName)) {
int mapSlots = status.getMaxMapSlots();
totalMapTaskCapacity -= mapSlots;
int reduceSlots = status.getMaxReduceSlots();
totalReduceTaskCapacity -= reduceSlots;
++numTrackersOnHost;
getInstrumentation().addBlackListedMapSlots(
mapSlots);
getInstrumentation().addBlackListedReduceSlots(
reduceSlots);
}
uniqueHostsMap.remove(hostName);
incrBlackListedTrackers(numTrackersOnHost);
}
}
// This is called on tracker's restart or after a day of blacklist.
private void addHostCapacity(String hostName) {
synchronized (taskTrackers) {
int numTrackersOnHost = 0;
// add the capacity of trackers on the host
for (TaskTrackerStatus status : getStatusesOnHost(hostName)) {
int mapSlots = status.getMaxMapSlots();
totalMapTaskCapacity += mapSlots;
int reduceSlots = status.getMaxReduceSlots();
totalReduceTaskCapacity += reduceSlots;
numTrackersOnHost++;
getInstrumentation().decBlackListedMapSlots(mapSlots);
getInstrumentation().decBlackListedReduceSlots(reduceSlots);
}
uniqueHostsMap.put(hostName,
numTrackersOnHost);
decrBlackListedTrackers(numTrackersOnHost);
}
}
/**
* Whether a host is blacklisted across all the jobs.
*
* Assumes JobTracker is locked on the entry.
* @param hostName
* @return
*/
boolean isBlacklisted(String hostName) {
synchronized (potentiallyFaultyTrackers) {
FaultInfo fi = null;
if ((fi = potentiallyFaultyTrackers.get(hostName)) != null) {
return fi.isBlacklisted();
}
}
return false;
}
// Assumes JobTracker is locked on the entry.
int getFaultCount(String hostName) {
synchronized (potentiallyFaultyTrackers) {
FaultInfo fi = null;
if ((fi = potentiallyFaultyTrackers.get(hostName)) != null) {
return fi.getFaultCount();
}
}
return 0;
}
// Assumes JobTracker is locked on the entry.
Set<ReasonForBlackListing> getReasonForBlackListing(String hostName) {
synchronized (potentiallyFaultyTrackers) {
FaultInfo fi = null;
if ((fi = potentiallyFaultyTrackers.get(hostName)) != null) {
return fi.getReasonforblacklisting();
}
}
return null;
}
// Assumes JobTracker is locked on the entry.
void setNodeHealthStatus(String hostName, boolean isHealthy, String reason) {
FaultInfo fi = null;
// If tracker is not healthy, create a fault info object
// blacklist it.
if (!isHealthy) {
fi = getFaultInfo(hostName, true);
fi.setHealthy(isHealthy);
synchronized (potentiallyFaultyTrackers) {
blackListTracker(hostName, reason,
ReasonForBlackListing.NODE_UNHEALTHY);
}
} else {
fi = getFaultInfo(hostName, false);
if (fi == null) {
return;
} else {
if (canUnBlackListTracker(hostName,
ReasonForBlackListing.NODE_UNHEALTHY)) {
unBlackListTracker(hostName, ReasonForBlackListing.NODE_UNHEALTHY);
}
}
}
}
}
/**
* Get all task tracker statuses on given host
*
* Assumes JobTracker is locked on the entry
* @param hostName
* @return {@link java.util.List} of {@link TaskTrackerStatus}
*/
private List<TaskTrackerStatus> getStatusesOnHost(String hostName) {
List<TaskTrackerStatus> statuses = new ArrayList<TaskTrackerStatus>();
synchronized (taskTrackers) {
for (TaskTracker tt : taskTrackers.values()) {
TaskTrackerStatus status = tt.getStatus();
if (hostName.equals(status.getHost())) {
statuses.add(status);
}
}
}
return statuses;
}
///////////////////////////////////////////////////////
// Used to recover the jobs upon restart
///////////////////////////////////////////////////////
class RecoveryManager {
Set<JobID> jobsToRecover; // set of jobs to be recovered
private int totalEventsRecovered = 0;
private int restartCount = 0;
private boolean shouldRecover = false;
Set<String> recoveredTrackers =
Collections.synchronizedSet(new HashSet<String>());
/** A custom listener that replays the events in the order in which the
* events (task attempts) occurred.
*/
class JobRecoveryListener implements Listener {
// The owner job
private JobInProgress jip;
private JobHistory.JobInfo job; // current job's info object
// Maintain the count of the (attempt) events recovered
private int numEventsRecovered = 0;
// Maintains open transactions
private Map<String, String> hangingAttempts =
new HashMap<String, String>();
// Whether there are any updates for this job
private boolean hasUpdates = false;
public JobRecoveryListener(JobInProgress jip) {
this.jip = jip;
this.job = new JobHistory.JobInfo(jip.getJobID().toString());
}
/**
* Process a task. Note that a task might commit a previously pending
* transaction.
*/
private void processTask(String taskId, JobHistory.Task task) {
// Any TASK info commits the previous transaction
boolean hasHanging = hangingAttempts.remove(taskId) != null;
if (hasHanging) {
numEventsRecovered += 2;
}
TaskID id = TaskID.forName(taskId);
TaskInProgress tip = getTip(id);
updateTip(tip, task);
}
/**
* Adds a task-attempt in the listener
*/
private void processTaskAttempt(String taskAttemptId,
JobHistory.TaskAttempt attempt) {
TaskAttemptID id = TaskAttemptID.forName(taskAttemptId);
// Check if the transaction for this attempt can be committed
String taskStatus = attempt.get(Keys.TASK_STATUS);
TaskAttemptID taskID = TaskAttemptID.forName(taskAttemptId);
JobInProgress jip = getJob(taskID.getJobID());
JobStatus prevStatus = (JobStatus)jip.getStatus().clone();
if (taskStatus.length() > 0) {
// This means this is an update event
if (taskStatus.equals(Values.SUCCESS.name())) {
// Mark this attempt as hanging
hangingAttempts.put(id.getTaskID().toString(), taskAttemptId);
addSuccessfulAttempt(jip, id, attempt);
} else {
addUnsuccessfulAttempt(jip, id, attempt);
numEventsRecovered += 2;
}
} else {
createTaskAttempt(jip, id, attempt);
}
JobStatus newStatus = (JobStatus)jip.getStatus().clone();
if (prevStatus.getRunState() != newStatus.getRunState()) {
if(LOG.isDebugEnabled())
LOG.debug("Status changed hence informing prevStatus" + prevStatus + " currentStatus "+ newStatus);
JobStatusChangeEvent event =
new JobStatusChangeEvent(jip, EventType.RUN_STATE_CHANGED,
prevStatus, newStatus);
updateJobInProgressListeners(event);
}
}
public void handle(JobHistory.RecordTypes recType, Map<Keys,
String> values) throws IOException {
if (recType == JobHistory.RecordTypes.Job) {
// Update the meta-level job information
job.handle(values);
// Forcefully init the job as we have some updates for it
checkAndInit();
} else if (recType.equals(JobHistory.RecordTypes.Task)) {
String taskId = values.get(Keys.TASKID);
// Create a task
JobHistory.Task task = new JobHistory.Task();
task.handle(values);
// Ignore if its a cleanup task
if (isCleanup(task)) {
return;
}
// Process the task i.e update the tip state
processTask(taskId, task);
} else if (recType.equals(JobHistory.RecordTypes.MapAttempt)) {
String attemptId = values.get(Keys.TASK_ATTEMPT_ID);
// Create a task attempt
JobHistory.MapAttempt attempt = new JobHistory.MapAttempt();
attempt.handle(values);
// Ignore if its a cleanup task
if (isCleanup(attempt)) {
return;
}
// Process the attempt i.e update the attempt state via job
processTaskAttempt(attemptId, attempt);
} else if (recType.equals(JobHistory.RecordTypes.ReduceAttempt)) {
String attemptId = values.get(Keys.TASK_ATTEMPT_ID);
// Create a task attempt
JobHistory.ReduceAttempt attempt = new JobHistory.ReduceAttempt();
attempt.handle(values);
// Ignore if its a cleanup task
if (isCleanup(attempt)) {
return;
}
// Process the attempt i.e update the job state via job
processTaskAttempt(attemptId, attempt);
}
}
// Check if the task is of type CLEANUP
private boolean isCleanup(JobHistory.Task task) {
String taskType = task.get(Keys.TASK_TYPE);
return Values.CLEANUP.name().equals(taskType);
}
// Init the job if its ready for init. Also make sure that the scheduler
// is updated
private void checkAndInit() throws IOException {
String jobStatus = this.job.get(Keys.JOB_STATUS);
if (Values.PREP.name().equals(jobStatus)) {
hasUpdates = true;
LOG.info("Calling init from RM for job " + jip.getJobID().toString());
try {
initJob(jip);
} catch (Throwable t) {
LOG.error("Job initialization failed : \n"
+ StringUtils.stringifyException(t));
failJob(jip);
throw new IOException(t);
}
}
}
void close() {
if (hasUpdates) {
// Apply the final (job-level) updates
JobStatusChangeEvent event = updateJob(jip, job);
synchronized (JobTracker.this) {
// Update the job listeners
updateJobInProgressListeners(event);
}
}
}
public int getNumEventsRecovered() {
return numEventsRecovered;
}
}
public RecoveryManager() {
jobsToRecover = new TreeSet<JobID>();
}
public boolean contains(JobID id) {
return jobsToRecover.contains(id);
}
void addJobForRecovery(JobID id) {
jobsToRecover.add(id);
}
public boolean shouldRecover() {
return shouldRecover;
}
public boolean shouldSchedule() {
return recoveredTrackers.isEmpty();
}
private void markTracker(String trackerName) {
recoveredTrackers.add(trackerName);
}
void unMarkTracker(String trackerName) {
recoveredTrackers.remove(trackerName);
}
Set<JobID> getJobsToRecover() {
return jobsToRecover;
}
/** Check if the given string represents a job-id or not
*/
private boolean isJobNameValid(String str) {
if(str == null) {
return false;
}
String[] parts = str.split("_");
if(parts.length == 3) {
if(parts[0].equals("job")) {
// other 2 parts should be parseable
return JobTracker.validateIdentifier(parts[1])
&& JobTracker.validateJobNumber(parts[2]);
}
}
return false;
}
// checks if the job dir has the required files
public void checkAndAddJob(FileStatus status) throws IOException {
String fileName = status.getPath().getName();
if (isJobNameValid(fileName)) {
if (JobClient.isJobDirValid(status.getPath(), fs)) {
recoveryManager.addJobForRecovery(JobID.forName(fileName));
shouldRecover = true; // enable actual recovery if num-files > 1
} else {
LOG.info("Found an incomplete job directory " + fileName + "."
+ " Deleting it!!");
fs.delete(status.getPath(), true);
}
}
}
private JobStatusChangeEvent updateJob(JobInProgress jip,
JobHistory.JobInfo job) {
// Change the job priority
String jobpriority = job.get(Keys.JOB_PRIORITY);
JobPriority priority = JobPriority.valueOf(jobpriority);
// It's important to update this via the jobtracker's api as it will
// take care of updating the event listeners too
try {
setJobPriority(jip.getJobID(), priority);
} catch (IOException e) {
// This will not happen. JobTracker can set jobPriority of any job
// as mrOwner has the needed permissions.
LOG.warn("Unexpected. JobTracker could not do SetJobPriority on "
+ jip.getJobID() + ". " + e);
}
// Save the previous job status
JobStatus oldStatus = (JobStatus)jip.getStatus().clone();
// Set the start/launch time only if there are recovered tasks
// Increment the job's restart count
jip.updateJobInfo(job.getLong(JobHistory.Keys.SUBMIT_TIME),
job.getLong(JobHistory.Keys.LAUNCH_TIME));
// Save the new job status
JobStatus newStatus = (JobStatus)jip.getStatus().clone();
return new JobStatusChangeEvent(jip, EventType.START_TIME_CHANGED, oldStatus,
newStatus);
}
private void updateTip(TaskInProgress tip, JobHistory.Task task) {
long startTime = task.getLong(Keys.START_TIME);
if (startTime != 0) {
tip.setExecStartTime(startTime);
}
long finishTime = task.getLong(Keys.FINISH_TIME);
// For failed tasks finish-time will be missing
if (finishTime != 0) {
tip.setExecFinishTime(finishTime);
}
String cause = task.get(Keys.TASK_ATTEMPT_ID);
if (cause.length() > 0) {
// This means that the this is a FAILED events
TaskAttemptID id = TaskAttemptID.forName(cause);
TaskStatus status = tip.getTaskStatus(id);
synchronized (JobTracker.this) {
// This will add the tip failed event in the new log
tip.getJob().failedTask(tip, id, status.getDiagnosticInfo(),
status.getPhase(), status.getRunState(),
status.getTaskTracker());
}
}
}
private void createTaskAttempt(JobInProgress job,
TaskAttemptID attemptId,
JobHistory.TaskAttempt attempt) {
TaskID id = attemptId.getTaskID();
String type = attempt.get(Keys.TASK_TYPE);
TaskInProgress tip = job.getTaskInProgress(id);
// I. Get the required info
TaskStatus taskStatus = null;
String trackerName = attempt.get(Keys.TRACKER_NAME);
String trackerHostName =
JobInProgress.convertTrackerNameToHostName(trackerName);
// recover the port information.
int port = 0; // default to 0
String hport = attempt.get(Keys.HTTP_PORT);
if (hport != null && hport.length() > 0) {
port = attempt.getInt(Keys.HTTP_PORT);
}
long attemptStartTime = attempt.getLong(Keys.START_TIME);
// II. Create the (appropriate) task status
if (type.equals(Values.MAP.name())) {
taskStatus =
new MapTaskStatus(attemptId, 0.0f, job.getNumSlotsPerTask(TaskType.MAP),
TaskStatus.State.RUNNING, "", "", trackerName,
TaskStatus.Phase.MAP, new Counters());
} else {
taskStatus =
new ReduceTaskStatus(attemptId, 0.0f, job.getNumSlotsPerTask(TaskType.REDUCE),
TaskStatus.State.RUNNING, "", "", trackerName,
TaskStatus.Phase.REDUCE, new Counters());
}
// Set the start time
taskStatus.setStartTime(attemptStartTime);
List<TaskStatus> ttStatusList = new ArrayList<TaskStatus>();
ttStatusList.add(taskStatus);
// III. Create the dummy tasktracker status
TaskTrackerStatus ttStatus =
new TaskTrackerStatus(trackerName, trackerHostName, port, ttStatusList,
0 , 0, 0);
ttStatus.setLastSeen(clock.getTime());
synchronized (JobTracker.this) {
synchronized (taskTrackers) {
synchronized (trackerExpiryQueue) {
// IV. Register a new tracker
TaskTracker taskTracker = getTaskTracker(trackerName);
boolean isTrackerRegistered = (taskTracker != null);
if (!isTrackerRegistered) {
markTracker(trackerName); // add the tracker to recovery-manager
taskTracker = new TaskTracker(trackerName);
taskTracker.setStatus(ttStatus);
addNewTracker(taskTracker);
}
// V. Update the tracker status
// This will update the meta info of the jobtracker and also add the
// tracker status if missing i.e register it
updateTaskTrackerStatus(trackerName, ttStatus);
}
}
// Register the attempt with job and tip, under JobTracker lock.
// Since, as of today they are atomic through heartbeat.
// VI. Register the attempt
// a) In the job
job.addRunningTaskToTIP(tip, attemptId, ttStatus, false);
// b) In the tip
tip.updateStatus(taskStatus);
}
// VII. Make an entry in the launched tasks
expireLaunchingTasks.addNewTask(attemptId);
}
private void addSuccessfulAttempt(JobInProgress job,
TaskAttemptID attemptId,
JobHistory.TaskAttempt attempt) {
// I. Get the required info
TaskID taskId = attemptId.getTaskID();
String type = attempt.get(Keys.TASK_TYPE);
TaskInProgress tip = job.getTaskInProgress(taskId);
long attemptFinishTime = attempt.getLong(Keys.FINISH_TIME);
// Get the task status and the tracker name and make a copy of it
TaskStatus taskStatus = (TaskStatus)tip.getTaskStatus(attemptId).clone();
taskStatus.setFinishTime(attemptFinishTime);
String stateString = attempt.get(Keys.STATE_STRING);
// Update the basic values
taskStatus.setStateString(stateString);
taskStatus.setProgress(1.0f);
taskStatus.setRunState(TaskStatus.State.SUCCEEDED);
// Set the shuffle/sort finished times
if (type.equals(Values.REDUCE.name())) {
long shuffleTime =
Long.parseLong(attempt.get(Keys.SHUFFLE_FINISHED));
long sortTime =
Long.parseLong(attempt.get(Keys.SORT_FINISHED));
taskStatus.setShuffleFinishTime(shuffleTime);
taskStatus.setSortFinishTime(sortTime);
}
// Add the counters
String counterString = attempt.get(Keys.COUNTERS);
Counters counter = null;
//TODO Check if an exception should be thrown
try {
counter = Counters.fromEscapedCompactString(counterString);
} catch (ParseException pe) {
counter = new Counters(); // Set it to empty counter
}
taskStatus.setCounters(counter);
synchronized (JobTracker.this) {
// II. Replay the status
job.updateTaskStatus(tip, taskStatus);
}
// III. Prevent the task from expiry
expireLaunchingTasks.removeTask(attemptId);
}
private void addUnsuccessfulAttempt(JobInProgress job,
TaskAttemptID attemptId,
JobHistory.TaskAttempt attempt) {
// I. Get the required info
TaskID taskId = attemptId.getTaskID();
TaskInProgress tip = job.getTaskInProgress(taskId);
long attemptFinishTime = attempt.getLong(Keys.FINISH_TIME);
TaskStatus taskStatus = (TaskStatus)tip.getTaskStatus(attemptId).clone();
taskStatus.setFinishTime(attemptFinishTime);
// Reset the progress
taskStatus.setProgress(0.0f);
String stateString = attempt.get(Keys.STATE_STRING);
taskStatus.setStateString(stateString);
boolean hasFailed =
attempt.get(Keys.TASK_STATUS).equals(Values.FAILED.name());
// Set the state failed/killed
if (hasFailed) {
taskStatus.setRunState(TaskStatus.State.FAILED);
} else {
taskStatus.setRunState(TaskStatus.State.KILLED);
}
// Get/Set the error msg
String diagInfo = attempt.get(Keys.ERROR);
taskStatus.setDiagnosticInfo(diagInfo); // diag info
synchronized (JobTracker.this) {
// II. Update the task status
job.updateTaskStatus(tip, taskStatus);
}
// III. Prevent the task from expiry
expireLaunchingTasks.removeTask(attemptId);
}
Path getRestartCountFile() {
return new Path(getSystemDir(), "jobtracker.info");
}
Path getTempRestartCountFile() {
return new Path(getSystemDir(), "jobtracker.info.recover");
}
/**
* Initialize the recovery process. It simply creates a jobtracker.info file
* in the jobtracker's system directory and writes its restart count in it.
* For the first start, the jobtracker writes '0' in it. Upon subsequent
* restarts the jobtracker replaces the count with its current count which
* is (old count + 1). The whole purpose of this api is to obtain restart
* counts across restarts to avoid attempt-id clashes.
*
* Note that in between if the jobtracker.info files goes missing then the
* jobtracker will disable recovery and continue.
*
*/
void updateRestartCount() throws IOException {
Path restartFile = getRestartCountFile();
Path tmpRestartFile = getTempRestartCountFile();
FsPermission filePerm = new FsPermission(SYSTEM_FILE_PERMISSION);
// read the count from the jobtracker info file
if (fs.exists(restartFile)) {
fs.delete(tmpRestartFile, false); // delete the tmp file
} else if (fs.exists(tmpRestartFile)) {
// if .rec exists then delete the main file and rename the .rec to main
fs.rename(tmpRestartFile, restartFile); // rename .rec to main file
} else {
// For the very first time the jobtracker will create a jobtracker.info
// file. If the jobtracker has restarted then disable recovery as files'
// needed for recovery are missing.
// disable recovery if this is a restart
shouldRecover = false;
// write the jobtracker.info file
try {
FSDataOutputStream out = FileSystem.create(fs, restartFile,
filePerm);
out.writeInt(0);
out.close();
} catch (IOException ioe) {
LOG.warn("Writing to file " + restartFile + " failed!");
LOG.warn("FileSystem is not ready yet!");
fs.delete(restartFile, false);
throw ioe;
}
return;
}
FSDataInputStream in = fs.open(restartFile);
try {
// read the old count
restartCount = in.readInt();
++restartCount; // increment the restart count
} catch (IOException ioe) {
LOG.warn("System directory is garbled. Failed to read file "
+ restartFile);
LOG.warn("Jobtracker recovery is not possible with garbled"
+ " system directory! Please delete the system directory and"
+ " restart the jobtracker. Note that deleting the system"
+ " directory will result in loss of all the running jobs.");
throw new RuntimeException(ioe);
} finally {
if (in != null) {
in.close();
}
}
// Write back the new restart count and rename the old info file
//TODO This is similar to jobhistory recovery, maybe this common code
// can be factored out.
// write to the tmp file
FSDataOutputStream out = FileSystem.create(fs, tmpRestartFile, filePerm);
out.writeInt(restartCount);
out.close();
// delete the main file
fs.delete(restartFile, false);
// rename the .rec to main file
fs.rename(tmpRestartFile, restartFile);
}
// mapred.JobID::forName returns
@SuppressWarnings("unchecked") // mapreduce.JobID
public void recover() {
if (!shouldRecover()) {
// clean up jobs structure
jobsToRecover.clear();
return;
}
LOG.info("Restart count of the jobtracker : " + restartCount);
// I. Init the jobs and cache the recovered job history filenames
Map<JobID, Path> jobHistoryFilenameMap = new HashMap<JobID, Path>();
Iterator<JobID> idIter = jobsToRecover.iterator();
// 0. Cleanup
try {
JobHistory.JobInfo.deleteConfFiles();
} catch (IOException ioe) {
LOG.info("Error in cleaning up job history folder", ioe);
}
JobInProgress job = null;
File jobIdFile = null;
// 0. Cleanup
try {
JobHistory.JobInfo.deleteConfFiles();
} catch (IOException ioe) {
LOG.info("Error in cleaning up job history folder", ioe);
}
while (idIter.hasNext()) {
JobID id = idIter.next();
LOG.info("Trying to recover details of job " + id);
try {
// 1. Recover job owner and create JIP
jobIdFile =
new File(lDirAlloc.getLocalPathToRead(SUBDIR + "/" + id, conf).toString());
String user = null;
if (jobIdFile != null && jobIdFile.exists()) {
LOG.info("File " + jobIdFile + " exists for job " + id);
FileInputStream in = new FileInputStream(jobIdFile);
BufferedReader reader = null;
try {
reader = new BufferedReader(new InputStreamReader(in));
user = reader.readLine();
LOG.info("Recovered user " + user + " for job " + id);
} finally {
if (reader != null) {
reader.close();
}
in.close();
}
}
if (user == null) {
throw new RuntimeException("Incomplete job " + id);
}
// Create the job
/* THIS PART OF THE CODE IS USELESS. JOB RECOVERY SHOULD BE
* BACKPORTED (MAPREDUCE-873)
*/
job = new JobInProgress(JobTracker.this, conf,
new JobInfo((org.apache.hadoop.mapreduce.JobID) id,
new Text(user), new Path(getStagingAreaDirInternal(user))),
restartCount, new Credentials() /*HACK*/);
// 2. Check if the user has appropriate access
// Get the user group info for the job's owner
UserGroupInformation ugi =
UserGroupInformation.createRemoteUser(job.getJobConf().getUser());
LOG.info("Submitting job " + id + " on behalf of user "
+ ugi.getShortUserName() + " in groups : "
+ StringUtils.arrayToString(ugi.getGroupNames()));
// check the access
try {
aclsManager.checkAccess(job, ugi, Operation.SUBMIT_JOB);
} catch (Throwable t) {
LOG.warn("Access denied for user " + ugi.getShortUserName()
+ " in groups : ["
+ StringUtils.arrayToString(ugi.getGroupNames()) + "]");
throw t;
}
// 3. Get the log file and the file path
String logFileName =
JobHistory.JobInfo.getJobHistoryFileName(job.getJobConf(), id);
if (logFileName != null) {
Path jobHistoryFilePath =
JobHistory.JobInfo.getJobHistoryLogLocation(logFileName);
// 4. Recover the history file. This involved
// - deleting file.recover if file exists
// - renaming file.recover to file if file doesnt exist
// This makes sure that the (master) file exists
JobHistory.JobInfo.recoverJobHistoryFile(job.getJobConf(),
jobHistoryFilePath);
// 5. Cache the history file name as it costs one dfs access
jobHistoryFilenameMap.put(job.getJobID(), jobHistoryFilePath);
} else {
LOG.info("No history file found for job " + id);
idIter.remove(); // remove from recovery list
}
// 6. Sumbit the job to the jobtracker
addJob(id, job);
} catch (Throwable t) {
LOG.warn("Failed to recover job " + id + " Ignoring the job.", t);
idIter.remove();
if (jobIdFile != null) {
jobIdFile.delete();
jobIdFile = null;
}
if (job != null) {
job.fail();
job = null;
}
continue;
}
}
long recoveryStartTime = clock.getTime();
// II. Recover each job
idIter = jobsToRecover.iterator();
while (idIter.hasNext()) {
JobID id = idIter.next();
JobInProgress pJob = getJob(id);
// 1. Get the required info
// Get the recovered history file
Path jobHistoryFilePath = jobHistoryFilenameMap.get(pJob.getJobID());
String logFileName = jobHistoryFilePath.getName();
FileSystem fs;
try {
fs = jobHistoryFilePath.getFileSystem(conf);
} catch (IOException ioe) {
LOG.warn("Failed to get the filesystem for job " + id + ". Ignoring.",
ioe);
continue;
}
// 2. Parse the history file
// Note that this also involves job update
JobRecoveryListener listener = new JobRecoveryListener(pJob);
try {
JobHistory.parseHistoryFromFS(jobHistoryFilePath.toString(),
listener, fs);
} catch (Throwable t) {
LOG.info("Error reading history file of job " + pJob.getJobID()
+ ". Ignoring the error and continuing.", t);
}
// 3. Close the listener
listener.close();
// 4. Update the recovery metric
totalEventsRecovered += listener.getNumEventsRecovered();
// 5. Cleanup history
// Delete the master log file as an indication that the new file
// should be used in future
try {
synchronized (pJob) {
JobHistory.JobInfo.checkpointRecovery(logFileName,
pJob.getJobConf());
}
} catch (Throwable t) {
LOG.warn("Failed to delete log file (" + logFileName + ") for job "
+ id + ". Continuing.", t);
}
if (pJob.isComplete()) {
idIter.remove(); // no need to keep this job info as its successful
}
}
recoveryDuration = clock.getTime() - recoveryStartTime;
hasRecovered = true;
// III. Finalize the recovery
synchronized (trackerExpiryQueue) {
// Make sure that the tracker statuses in the expiry-tracker queue
// are updated
long now = clock.getTime();
int size = trackerExpiryQueue.size();
for (int i = 0; i < size ; ++i) {
// Get the first tasktracker
TaskTrackerStatus taskTracker = trackerExpiryQueue.first();
// Remove it
trackerExpiryQueue.remove(taskTracker);
// Set the new time
taskTracker.setLastSeen(now);
// Add back to get the sorted list
trackerExpiryQueue.add(taskTracker);
}
}
LOG.info("Restoration complete");
}
int totalEventsRecovered() {
return totalEventsRecovered;
}
}
private final JobTrackerInstrumentation myInstrumentation;
/////////////////////////////////////////////////////////////////
// The real JobTracker
////////////////////////////////////////////////////////////////
int port;
String localMachine;
private String trackerIdentifier;
long startTime;
int totalSubmissions = 0;
private int totalMapTaskCapacity;
private int totalReduceTaskCapacity;
private HostsFileReader hostsReader;
// JobTracker recovery variables
private volatile boolean hasRestarted = false;
private volatile boolean hasRecovered = false;
private volatile long recoveryDuration;
//
// Properties to maintain while running Jobs and Tasks:
//
// 1. Each Task is always contained in a single Job. A Job succeeds when all its
// Tasks are complete.
//
// 2. Every running or successful Task is assigned to a Tracker. Idle Tasks are not.
//
// 3. When a Tracker fails, all of its assigned Tasks are marked as failures.
//
// 4. A Task might need to be reexecuted if it (or the machine it's hosted on) fails
// before the Job is 100% complete. Sometimes an upstream Task can fail without
// reexecution if all downstream Tasks that require its output have already obtained
// the necessary files.
//
// All the known jobs. (jobid->JobInProgress)
Map<JobID, JobInProgress> jobs =
Collections.synchronizedMap(new TreeMap<JobID, JobInProgress>());
// (user -> list of JobInProgress)
TreeMap<String, ArrayList<JobInProgress>> userToJobsMap =
new TreeMap<String, ArrayList<JobInProgress>>();
// (trackerID --> list of jobs to cleanup)
Map<String, Set<JobID>> trackerToJobsToCleanup =
new HashMap<String, Set<JobID>>();
// (trackerID --> list of tasks to cleanup)
Map<String, Set<TaskAttemptID>> trackerToTasksToCleanup =
new HashMap<String, Set<TaskAttemptID>>();
// All the known TaskInProgress items, mapped to by taskids (taskid->TIP)
Map<TaskAttemptID, TaskInProgress> taskidToTIPMap =
new TreeMap<TaskAttemptID, TaskInProgress>();
// This is used to keep track of all trackers running on one host. While
// decommissioning the host, all the trackers on the host will be lost.
Map<String, Set<TaskTracker>> hostnameToTaskTracker =
Collections.synchronizedMap(new TreeMap<String, Set<TaskTracker>>());
// (taskid --> trackerID)
TreeMap<TaskAttemptID, String> taskidToTrackerMap = new TreeMap<TaskAttemptID, String>();
// (trackerID->TreeSet of taskids running at that tracker)
TreeMap<String, Set<TaskAttemptID>> trackerToTaskMap =
new TreeMap<String, Set<TaskAttemptID>>();
// (trackerID -> TreeSet of completed taskids running at that tracker)
TreeMap<String, Set<TaskAttemptID>> trackerToMarkedTasksMap =
new TreeMap<String, Set<TaskAttemptID>>();
// (trackerID --> last sent HeartBeatResponse)
Map<String, HeartbeatResponse> trackerToHeartbeatResponseMap =
new TreeMap<String, HeartbeatResponse>();
// (hostname --> Node (NetworkTopology))
Map<String, Node> hostnameToNodeMap =
Collections.synchronizedMap(new TreeMap<String, Node>());
// Number of resolved entries
int numResolved;
private FaultyTrackersInfo faultyTrackers = new FaultyTrackersInfo();
private JobTrackerStatistics statistics =
new JobTrackerStatistics();
//
// Watch and expire TaskTracker objects using these structures.
// We can map from Name->TaskTrackerStatus, or we can expire by time.
//
int totalMaps = 0;
int totalReduces = 0;
private int occupiedMapSlots = 0;
private int occupiedReduceSlots = 0;
private int reservedMapSlots = 0;
private int reservedReduceSlots = 0;
private HashMap<String, TaskTracker> taskTrackers =
new HashMap<String, TaskTracker>();
Map<String,Integer>uniqueHostsMap = new ConcurrentHashMap<String, Integer>();
ExpireTrackers expireTrackers = new ExpireTrackers();
Thread expireTrackersThread = null;
RetireJobs retireJobs = new RetireJobs();
Thread retireJobsThread = null;
final int retiredJobsCacheSize;
ExpireLaunchingTasks expireLaunchingTasks = new ExpireLaunchingTasks();
Thread expireLaunchingTaskThread = new Thread(expireLaunchingTasks,
"expireLaunchingTasks");
CompletedJobStatusStore completedJobStatusStore = null;
Thread completedJobsStoreThread = null;
RecoveryManager recoveryManager;
/**
* It might seem like a bug to maintain a TreeSet of tasktracker objects,
* which can be updated at any time. But that's not what happens! We
* only update status objects in the taskTrackers table. Status objects
* are never updated once they enter the expiry queue. Instead, we wait
* for them to expire and remove them from the expiry queue. If a status
* object has been updated in the taskTracker table, the latest status is
* reinserted. Otherwise, we assume the tracker has expired.
*/
TreeSet<TaskTrackerStatus> trackerExpiryQueue =
new TreeSet<TaskTrackerStatus>(
new Comparator<TaskTrackerStatus>() {
public int compare(TaskTrackerStatus p1, TaskTrackerStatus p2) {
if (p1.getLastSeen() < p2.getLastSeen()) {
return -1;
} else if (p1.getLastSeen() > p2.getLastSeen()) {
return 1;
} else {
return (p1.getTrackerName().compareTo(p2.getTrackerName()));
}
}
}
);
// Used to provide an HTML view on Job, Task, and TaskTracker structures
final HttpServer infoServer;
int infoPort;
Server interTrackerServer;
// Some jobs are stored in a local system directory. We can delete
// the files when we're done with the job.
static final String SUBDIR = "jobTracker";
final LocalFileSystem localFs;
FileSystem fs = null;
Path systemDir = null;
JobConf conf;
private final ACLsManager aclsManager;
long limitMaxMemForMapTasks;
long limitMaxMemForReduceTasks;
long memSizeForMapSlotOnJT;
long memSizeForReduceSlotOnJT;
private QueueManager queueManager;
/**
* Start the JobTracker process, listen on the indicated port
*/
JobTracker(JobConf conf) throws IOException, InterruptedException {
this(conf, generateNewIdentifier());
}
JobTracker(JobConf conf, Clock clock)
throws IOException, InterruptedException {
this(conf, generateNewIdentifier(), clock);
}
public static final String JT_USER_NAME = "mapreduce.jobtracker.kerberos.principal";
public static final String JT_KEYTAB_FILE =
"mapreduce.jobtracker.keytab.file";
JobTracker(final JobConf conf, String identifier)
throws IOException, InterruptedException {
this(conf, identifier, new Clock());
}
JobTracker(final JobConf conf, String identifier, Clock clock)
throws IOException, InterruptedException {
this.clock = clock;
// Set ports, start RPC servers, setup security policy etc.
InetSocketAddress addr = getAddress(conf);
this.localMachine = addr.getHostName();
this.port = addr.getPort();
// find the owner of the process
// get the desired principal to load
UserGroupInformation.setConfiguration(conf);
SecurityUtil.login(conf, JT_KEYTAB_FILE, JT_USER_NAME, localMachine);
long secretKeyInterval =
conf.getLong(DELEGATION_KEY_UPDATE_INTERVAL_KEY,
DELEGATION_KEY_UPDATE_INTERVAL_DEFAULT);
long tokenMaxLifetime =
conf.getLong(DELEGATION_TOKEN_MAX_LIFETIME_KEY,
DELEGATION_TOKEN_MAX_LIFETIME_DEFAULT);
long tokenRenewInterval =
conf.getLong(DELEGATION_TOKEN_RENEW_INTERVAL_KEY,
DELEGATION_TOKEN_RENEW_INTERVAL_DEFAULT);
secretManager =
new DelegationTokenSecretManager(secretKeyInterval,
tokenMaxLifetime,
tokenRenewInterval,
DELEGATION_TOKEN_GC_INTERVAL);
secretManager.startThreads();
//
// Grab some static constants
//
TASKTRACKER_EXPIRY_INTERVAL =
conf.getLong("mapred.tasktracker.expiry.interval", 10 * 60 * 1000);
RETIRE_JOB_INTERVAL = conf.getLong("mapred.jobtracker.retirejob.interval", 24 * 60 * 60 * 1000);
RETIRE_JOB_CHECK_INTERVAL = conf.getLong("mapred.jobtracker.retirejob.check", 60 * 1000);
retiredJobsCacheSize =
conf.getInt("mapred.job.tracker.retiredjobs.cache.size", 1000);
MAX_COMPLETE_USER_JOBS_IN_MEMORY = conf.getInt("mapred.jobtracker.completeuserjobs.maximum", 100);
MAX_BLACKLISTS_PER_TRACKER =
conf.getInt("mapred.max.tracker.blacklists", 4);
NUM_HEARTBEATS_IN_SECOND =
conf.getInt(JT_HEARTBEATS_IN_SECOND, DEFAULT_NUM_HEARTBEATS_IN_SECOND);
if (NUM_HEARTBEATS_IN_SECOND < MIN_NUM_HEARTBEATS_IN_SECOND) {
NUM_HEARTBEATS_IN_SECOND = DEFAULT_NUM_HEARTBEATS_IN_SECOND;
}
HEARTBEATS_SCALING_FACTOR =
conf.getFloat(JT_HEARTBEATS_SCALING_FACTOR,
DEFAULT_HEARTBEATS_SCALING_FACTOR);
if (HEARTBEATS_SCALING_FACTOR < MIN_HEARTBEATS_SCALING_FACTOR) {
HEARTBEATS_SCALING_FACTOR = DEFAULT_HEARTBEATS_SCALING_FACTOR;
}
//This configuration is there solely for tuning purposes and
//once this feature has been tested in real clusters and an appropriate
//value for the threshold has been found, this config might be taken out.
AVERAGE_BLACKLIST_THRESHOLD =
conf.getFloat("mapred.cluster.average.blacklist.threshold", 0.5f);
// This is a directory of temporary submission files. We delete it
// on startup, and can delete any files that we're done with
this.conf = conf;
JobConf jobConf = new JobConf(conf);
initializeTaskMemoryRelatedConfig();
// Read the hosts/exclude files to restrict access to the jobtracker.
this.hostsReader = new HostsFileReader(conf.get("mapred.hosts", ""),
conf.get("mapred.hosts.exclude", ""));
Configuration queuesConf = new Configuration(this.conf);
queueManager = new QueueManager(queuesConf);
aclsManager = new ACLsManager(conf, new JobACLsManager(conf), queueManager);
LOG.info("Starting jobtracker with owner as " +
getMROwner().getShortUserName());
// Create the scheduler
Class<? extends TaskScheduler> schedulerClass
= conf.getClass("mapred.jobtracker.taskScheduler",
JobQueueTaskScheduler.class, TaskScheduler.class);
taskScheduler = (TaskScheduler) ReflectionUtils.newInstance(schedulerClass, conf);
int handlerCount = conf.getInt("mapred.job.tracker.handler.count", 10);
this.interTrackerServer =
RPC.getServer(this, addr.getHostName(), addr.getPort(), handlerCount,
false, conf, secretManager);
// Set service-level authorization security policy
if (conf.getBoolean(
CommonConfigurationKeys.HADOOP_SECURITY_AUTHORIZATION, false)) {
this.interTrackerServer.refreshServiceAcl(conf, new MapReducePolicyProvider());
}
if (LOG.isDebugEnabled()) {
Properties p = System.getProperties();
for (Iterator it = p.keySet().iterator(); it.hasNext();) {
String key = (String) it.next();
String val = p.getProperty(key);
LOG.debug("Property '" + key + "' is " + val);
}
}
String infoAddr =
NetUtils.getServerAddress(conf, "mapred.job.tracker.info.bindAddress",
"mapred.job.tracker.info.port",
"mapred.job.tracker.http.address");
InetSocketAddress infoSocAddr = NetUtils.createSocketAddr(infoAddr);
String infoBindAddress = infoSocAddr.getHostName();
int tmpInfoPort = infoSocAddr.getPort();
this.startTime = clock.getTime();
infoServer = new HttpServer("job", infoBindAddress, tmpInfoPort,
tmpInfoPort == 0, conf, aclsManager.getAdminsAcl());
infoServer.setAttribute("job.tracker", this);
// initialize history parameters.
final JobTracker jtFinal = this;
boolean historyInitialized =
getMROwner().doAs(new PrivilegedExceptionAction<Boolean>() {
@Override
public Boolean run() throws Exception {
return JobHistory.init(jtFinal, conf,jtFinal.localMachine,
jtFinal.startTime);
}
});
infoServer.addServlet("reducegraph", "/taskgraph", TaskGraphServlet.class);
infoServer.start();
this.trackerIdentifier = identifier;
// Initialize instrumentation
JobTrackerInstrumentation tmp;
Class<? extends JobTrackerInstrumentation> metricsInst =
getInstrumentationClass(jobConf);
try {
java.lang.reflect.Constructor<? extends JobTrackerInstrumentation> c =
metricsInst.getConstructor(new Class[] {JobTracker.class, JobConf.class} );
tmp = c.newInstance(this, jobConf);
} catch(Exception e) {
//Reflection can throw lots of exceptions -- handle them all by
//falling back on the default.
LOG.error("failed to initialize job tracker metrics", e);
tmp = new JobTrackerMetricsInst(this, jobConf);
}
myInstrumentation = tmp;
// The rpc/web-server ports can be ephemeral ports...
// ... ensure we have the correct info
this.port = interTrackerServer.getListenerAddress().getPort();
this.conf.set("mapred.job.tracker", (this.localMachine + ":" + this.port));
this.localFs = FileSystem.getLocal(conf);
LOG.info("JobTracker up at: " + this.port);
this.infoPort = this.infoServer.getPort();
this.conf.set("mapred.job.tracker.http.address",
infoBindAddress + ":" + this.infoPort);
LOG.info("JobTracker webserver: " + this.infoServer.getPort());
// start the recovery manager
recoveryManager = new RecoveryManager();
// start async disk service for asynchronous deletion service
asyncDiskService = new MRAsyncDiskService(FileSystem.getLocal(jobConf),
jobConf.getLocalDirs());
while (!Thread.currentThread().isInterrupted()) {
try {
// if we haven't contacted the namenode go ahead and do it
if (fs == null) {
fs = getMROwner().doAs(new PrivilegedExceptionAction<FileSystem>() {
public FileSystem run() throws IOException {
return FileSystem.get(conf);
}});
}
// clean up the system dir, which will only work if hdfs is out of
// safe mode
if(systemDir == null) {
systemDir = new Path(getSystemDir());
}
try {
FileStatus systemDirStatus = fs.getFileStatus(systemDir);
if (!systemDirStatus.getOwner().equals(
getMROwner().getShortUserName())) {
throw new AccessControlException("The systemdir " + systemDir +
" is not owned by " + getMROwner().getShortUserName());
}
if (!systemDirStatus.getPermission().equals(SYSTEM_DIR_PERMISSION)) {
LOG.warn("Incorrect permissions on " + systemDir +
". Setting it to " + SYSTEM_DIR_PERMISSION);
fs.setPermission(systemDir,new FsPermission(SYSTEM_DIR_PERMISSION));
}
} catch (FileNotFoundException fnf) {} //ignore
// Make sure that the backup data is preserved
FileStatus[] systemDirData = fs.listStatus(this.systemDir);
// Check if the history is enabled .. as we cant have persistence with
// history disabled
if (conf.getBoolean("mapred.jobtracker.restart.recover", false)
&& !JobHistory.isDisableHistory()
&& systemDirData != null) {
for (FileStatus status : systemDirData) {
try {
recoveryManager.checkAndAddJob(status);
} catch (Throwable t) {
LOG.warn("Failed to add the job " + status.getPath().getName(),
t);
}
}
// Check if there are jobs to be recovered
hasRestarted = recoveryManager.shouldRecover();
if (hasRestarted) {
break; // if there is something to recover else clean the sys dir
}
}
LOG.info("Cleaning up the system directory");
fs.delete(systemDir, true);
if (FileSystem.mkdirs(fs, systemDir,
new FsPermission(SYSTEM_DIR_PERMISSION))) {
break;
}
LOG.error("Mkdirs failed to create " + systemDir);
} catch (AccessControlException ace) {
LOG.warn("Failed to operate on mapred.system.dir (" + systemDir
+ ") because of permissions.");
LOG.warn("Manually delete the mapred.system.dir (" + systemDir
+ ") and then start the JobTracker.");
LOG.warn("Bailing out ... ", ace);
throw ace;
} catch (IOException ie) {
LOG.info("problem cleaning system directory: " + systemDir, ie);
}
Thread.sleep(FS_ACCESS_RETRY_PERIOD);
}
if (Thread.currentThread().isInterrupted()) {
throw new InterruptedException();
}
// Same with 'localDir' except it's always on the local disk.
asyncDiskService.moveAndDeleteFromEachVolume(SUBDIR);
if (!hasRestarted) {
jobConf.deleteLocalFiles(SUBDIR);
}
// Initialize history DONE folder
if (historyInitialized) {
FileSystem historyFS = getMROwner().doAs(
new PrivilegedExceptionAction<FileSystem>() {
public FileSystem run() throws IOException {
JobHistory.initDone(conf, fs);
final String historyLogDir =
JobHistory.getCompletedJobHistoryLocation().toString();
infoServer.setAttribute("historyLogDir", historyLogDir);
return new Path(historyLogDir).getFileSystem(conf);
}
});
infoServer.setAttribute("fileSys", historyFS);
}
this.dnsToSwitchMapping = ReflectionUtils.newInstance(
conf.getClass("topology.node.switch.mapping.impl", ScriptBasedMapping.class,
DNSToSwitchMapping.class), conf);
this.numTaskCacheLevels = conf.getInt("mapred.task.cache.levels",
NetworkTopology.DEFAULT_HOST_LEVEL);
//initializes the job status store
completedJobStatusStore = new CompletedJobStatusStore(conf, aclsManager);
pluginDispatcher = PluginDispatcher.createFromConfiguration(
conf, "mapred.jobtracker.plugins", JobTrackerPlugin.class);
pluginDispatcher.dispatchStart(this);
}
private static SimpleDateFormat getDateFormat() {
return new SimpleDateFormat("yyyyMMddHHmm");
}
private static String generateNewIdentifier() {
return getDateFormat().format(new Date());
}
static boolean validateIdentifier(String id) {
try {
// the jobtracker id should be 'date' parseable
getDateFormat().parse(id);
return true;
} catch (ParseException pe) {}
return false;
}
static boolean validateJobNumber(String id) {
try {
// the job number should be integer parseable
Integer.parseInt(id);
return true;
} catch (IllegalArgumentException pe) {}
return false;
}
/**
* Whether the JT has restarted
*/
public boolean hasRestarted() {
return hasRestarted;
}
/**
* Whether the JT has recovered upon restart
*/
public boolean hasRecovered() {
return hasRecovered;
}
/**
* How long the jobtracker took to recover from restart.
*/
public long getRecoveryDuration() {
return hasRestarted()
? recoveryDuration
: 0;
}
/**
* Get JobTracker's FileSystem. This is the filesystem for mapred.system.dir.
*/
FileSystem getFileSystem() {
return fs;
}
/**
* Get JobTracker's LocalFileSystem handle. This is used by jobs for
* localizing job files to the local disk.
*/
LocalFileSystem getLocalFileSystem() throws IOException {
return localFs;
}
public static Class<? extends JobTrackerInstrumentation> getInstrumentationClass(Configuration conf) {
return conf.getClass("mapred.jobtracker.instrumentation",
JobTrackerMetricsInst.class, JobTrackerInstrumentation.class);
}
public static void setInstrumentationClass(Configuration conf, Class<? extends JobTrackerInstrumentation> t) {
conf.setClass("mapred.jobtracker.instrumentation",
t, JobTrackerInstrumentation.class);
}
JobTrackerInstrumentation getInstrumentation() {
return myInstrumentation;
}
public static InetSocketAddress getAddress(Configuration conf) {
String jobTrackerStr =
conf.get("mapred.job.tracker", "localhost:8012");
return NetUtils.createSocketAddr(jobTrackerStr);
}
/**
* Run forever
*/
public void offerService() throws InterruptedException, IOException {
// Prepare for recovery. This is done irrespective of the status of restart
// flag.
while (true) {
try {
recoveryManager.updateRestartCount();
break;
} catch (IOException ioe) {
LOG.warn("Failed to initialize recovery manager. ", ioe);
// wait for some time
Thread.sleep(FS_ACCESS_RETRY_PERIOD);
LOG.warn("Retrying...");
}
}
taskScheduler.start();
// Start the recovery after starting the scheduler
try {
recoveryManager.recover();
} catch (Throwable t) {
LOG.warn("Recovery manager crashed! Ignoring.", t);
}
// refresh the node list as the recovery manager might have added
// disallowed trackers
refreshHosts();
this.expireTrackersThread = new Thread(this.expireTrackers,
"expireTrackers");
this.expireTrackersThread.start();
this.retireJobsThread = new Thread(this.retireJobs, "retireJobs");
this.retireJobsThread.start();
expireLaunchingTaskThread.start();
if (completedJobStatusStore.isActive()) {
completedJobsStoreThread = new Thread(completedJobStatusStore,
"completedjobsStore-housekeeper");
completedJobsStoreThread.start();
}
// start the inter-tracker server once the jt is ready
this.interTrackerServer.start();
synchronized (this) {
state = State.RUNNING;
}
LOG.info("Starting RUNNING");
this.interTrackerServer.join();
LOG.info("Stopped interTrackerServer");
}
void close() throws IOException {
if (this.pluginDispatcher != null) {
LOG.info("Stopping pluginDispatcher");
pluginDispatcher.dispatchStop();
}
if (this.infoServer != null) {
LOG.info("Stopping infoServer");
try {
this.infoServer.stop();
} catch (Exception ex) {
LOG.warn("Exception shutting down JobTracker", ex);
}
}
if (this.interTrackerServer != null) {
LOG.info("Stopping interTrackerServer");
this.interTrackerServer.stop();
}
if (this.expireTrackersThread != null && this.expireTrackersThread.isAlive()) {
LOG.info("Stopping expireTrackers");
this.expireTrackersThread.interrupt();
try {
this.expireTrackersThread.join();
} catch (InterruptedException ex) {
ex.printStackTrace();
}
}
if (this.retireJobsThread != null && this.retireJobsThread.isAlive()) {
LOG.info("Stopping retirer");
this.retireJobsThread.interrupt();
try {
this.retireJobsThread.join();
} catch (InterruptedException ex) {
ex.printStackTrace();
}
}
if (taskScheduler != null) {
taskScheduler.terminate();
}
if (this.expireLaunchingTaskThread != null && this.expireLaunchingTaskThread.isAlive()) {
LOG.info("Stopping expireLaunchingTasks");
this.expireLaunchingTaskThread.interrupt();
try {
this.expireLaunchingTaskThread.join();
} catch (InterruptedException ex) {
ex.printStackTrace();
}
}
if (this.completedJobsStoreThread != null &&
this.completedJobsStoreThread.isAlive()) {
LOG.info("Stopping completedJobsStore thread");
this.completedJobsStoreThread.interrupt();
try {
this.completedJobsStoreThread.join();
} catch (InterruptedException ex) {
ex.printStackTrace();
}
}
DelegationTokenRenewal.close();
LOG.info("stopped all jobtracker services");
return;
}
///////////////////////////////////////////////////////
// Maintain lookup tables; called by JobInProgress
// and TaskInProgress
///////////////////////////////////////////////////////
void createTaskEntry(TaskAttemptID taskid, String taskTracker, TaskInProgress tip) {
LOG.info("Adding task (" + tip.getAttemptType(taskid) + ") " +
"'" + taskid + "' to tip " +
tip.getTIPId() + ", for tracker '" + taskTracker + "'");
// taskid --> tracker
taskidToTrackerMap.put(taskid, taskTracker);
// tracker --> taskid
Set<TaskAttemptID> taskset = trackerToTaskMap.get(taskTracker);
if (taskset == null) {
taskset = new TreeSet<TaskAttemptID>();
trackerToTaskMap.put(taskTracker, taskset);
}
taskset.add(taskid);
// taskid --> TIP
taskidToTIPMap.put(taskid, tip);
}
void removeTaskEntry(TaskAttemptID taskid) {
// taskid --> tracker
String tracker = taskidToTrackerMap.remove(taskid);
// tracker --> taskid
if (tracker != null) {
Set<TaskAttemptID> trackerSet = trackerToTaskMap.get(tracker);
if (trackerSet != null) {
trackerSet.remove(taskid);
}
}
// taskid --> TIP
if (taskidToTIPMap.remove(taskid) != null) {
LOG.info("Removing task '" + taskid + "'");
}
}
/**
* Mark a 'task' for removal later.
* This function assumes that the JobTracker is locked on entry.
*
* @param taskTracker the tasktracker at which the 'task' was running
* @param taskid completed (success/failure/killed) task
*/
void markCompletedTaskAttempt(String taskTracker, TaskAttemptID taskid) {
// tracker --> taskid
Set<TaskAttemptID> taskset = trackerToMarkedTasksMap.get(taskTracker);
if (taskset == null) {
taskset = new TreeSet<TaskAttemptID>();
trackerToMarkedTasksMap.put(taskTracker, taskset);
}
taskset.add(taskid);
if (LOG.isDebugEnabled()) {
LOG.debug("Marked '" + taskid + "' from '" + taskTracker + "'");
}
}
/**
* Mark all 'non-running' jobs of the job for pruning.
* This function assumes that the JobTracker is locked on entry.
*
* @param job the completed job
*/
void markCompletedJob(JobInProgress job) {
for (TaskInProgress tip : job.getTasks(TaskType.JOB_SETUP)) {
for (TaskStatus taskStatus : tip.getTaskStatuses()) {
if (taskStatus.getRunState() != TaskStatus.State.RUNNING &&
taskStatus.getRunState() != TaskStatus.State.COMMIT_PENDING &&
taskStatus.getRunState() != TaskStatus.State.UNASSIGNED) {
markCompletedTaskAttempt(taskStatus.getTaskTracker(),
taskStatus.getTaskID());
}
}
}
for (TaskInProgress tip : job.getTasks(TaskType.MAP)) {
for (TaskStatus taskStatus : tip.getTaskStatuses()) {
if (taskStatus.getRunState() != TaskStatus.State.RUNNING &&
taskStatus.getRunState() != TaskStatus.State.COMMIT_PENDING &&
taskStatus.getRunState() != TaskStatus.State.FAILED_UNCLEAN &&
taskStatus.getRunState() != TaskStatus.State.KILLED_UNCLEAN &&
taskStatus.getRunState() != TaskStatus.State.UNASSIGNED) {
markCompletedTaskAttempt(taskStatus.getTaskTracker(),
taskStatus.getTaskID());
}
}
}
for (TaskInProgress tip : job.getTasks(TaskType.REDUCE)) {
for (TaskStatus taskStatus : tip.getTaskStatuses()) {
if (taskStatus.getRunState() != TaskStatus.State.RUNNING &&
taskStatus.getRunState() != TaskStatus.State.COMMIT_PENDING &&
taskStatus.getRunState() != TaskStatus.State.FAILED_UNCLEAN &&
taskStatus.getRunState() != TaskStatus.State.KILLED_UNCLEAN &&
taskStatus.getRunState() != TaskStatus.State.UNASSIGNED) {
markCompletedTaskAttempt(taskStatus.getTaskTracker(),
taskStatus.getTaskID());
}
}
}
}
/**
* Remove all 'marked' tasks running on a given {@link TaskTracker}
* from the {@link JobTracker}'s data-structures.
* This function assumes that the JobTracker is locked on entry.
*
* @param taskTracker tasktracker whose 'non-running' tasks are to be purged
*/
private void removeMarkedTasks(String taskTracker) {
// Purge all the 'marked' tasks which were running at taskTracker
Set<TaskAttemptID> markedTaskSet =
trackerToMarkedTasksMap.get(taskTracker);
if (markedTaskSet != null) {
for (TaskAttemptID taskid : markedTaskSet) {
removeTaskEntry(taskid);
if (LOG.isDebugEnabled()) {
LOG.debug("Removed marked completed task '" + taskid + "' from '" +
taskTracker + "'");
}
}
// Clear
trackerToMarkedTasksMap.remove(taskTracker);
}
}
/**
* Call {@link #removeTaskEntry(String)} for each of the
* job's tasks.
* When the JobTracker is retiring the long-completed
* job, either because it has outlived {@link #RETIRE_JOB_INTERVAL}
* or the limit of {@link #MAX_COMPLETE_USER_JOBS_IN_MEMORY} jobs
* has been reached, we can afford to nuke all it's tasks; a little
* unsafe, but practically feasible.
*
* @param job the job about to be 'retired'
*/
synchronized void removeJobTasks(JobInProgress job) {
// iterate over all the task types
for (TaskType type : TaskType.values()) {
// iterate over all the tips of the type under consideration
for (TaskInProgress tip : job.getTasks(type)) {
// iterate over all the task-ids in the tip under consideration
for (TaskAttemptID id : tip.getAllTaskAttemptIDs()) {
// remove the task-id entry from the jobtracker
removeTaskEntry(id);
}
}
}
}
/**
* Safe clean-up all data structures at the end of the
* job (success/failure/killed).
* Here we also ensure that for a given user we maintain
* information for only MAX_COMPLETE_USER_JOBS_IN_MEMORY jobs
* on the JobTracker.
*
* @param job completed job.
*/
synchronized void finalizeJob(JobInProgress job) {
// Mark the 'non-running' tasks for pruning
markCompletedJob(job);
JobEndNotifier.registerNotification(job.getJobConf(), job.getStatus());
// start the merge of log files
JobID id = job.getStatus().getJobID();
if (job.hasRestarted()) {
try {
JobHistory.JobInfo.finalizeRecovery(id, job.getJobConf());
} catch (IOException ioe) {
LOG.info("Failed to finalize the log file recovery for job " + id, ioe);
}
}
// mark the job as completed
try {
JobHistory.JobInfo.markCompleted(id);
} catch (IOException ioe) {
LOG.info("Failed to mark job " + id + " as completed!", ioe);
}
final JobTrackerInstrumentation metrics = getInstrumentation();
metrics.finalizeJob(conf, id);
long now = clock.getTime();
// mark the job for cleanup at all the trackers
addJobForCleanup(id);
// add the blacklisted trackers to potentially faulty list
if (job.getStatus().getRunState() == JobStatus.SUCCEEDED) {
if (job.getNoOfBlackListedTrackers() > 0) {
for (String hostName : job.getBlackListedTrackers()) {
faultyTrackers.incrementFaults(hostName);
}
}
}
String jobUser = job.getProfile().getUser();
//add to the user to jobs mapping
synchronized (userToJobsMap) {
ArrayList<JobInProgress> userJobs = userToJobsMap.get(jobUser);
if (userJobs == null) {
userJobs = new ArrayList<JobInProgress>();
userToJobsMap.put(jobUser, userJobs);
}
userJobs.add(job);
}
}
///////////////////////////////////////////////////////
// Accessors for objects that want info on jobs, tasks,
// trackers, etc.
///////////////////////////////////////////////////////
public int getTotalSubmissions() {
return totalSubmissions;
}
public String getJobTrackerMachine() {
return localMachine;
}
/**
* Get the unique identifier (ie. timestamp) of this job tracker start.
* @return a string with a unique identifier
*/
public String getTrackerIdentifier() {
return trackerIdentifier;
}
public int getTrackerPort() {
return port;
}
public int getInfoPort() {
return infoPort;
}
public long getStartTime() {
return startTime;
}
public Vector<JobInProgress> runningJobs() {
Vector<JobInProgress> v = new Vector<JobInProgress>();
for (Iterator it = jobs.values().iterator(); it.hasNext();) {
JobInProgress jip = (JobInProgress) it.next();
JobStatus status = jip.getStatus();
if (status.getRunState() == JobStatus.RUNNING) {
v.add(jip);
}
}
return v;
}
/**
* Version that is called from a timer thread, and therefore needs to be
* careful to synchronize.
*/
public synchronized List<JobInProgress> getRunningJobs() {
synchronized (jobs) {
return runningJobs();
}
}
public Vector<JobInProgress> failedJobs() {
Vector<JobInProgress> v = new Vector<JobInProgress>();
for (Iterator it = jobs.values().iterator(); it.hasNext();) {
JobInProgress jip = (JobInProgress) it.next();
JobStatus status = jip.getStatus();
if ((status.getRunState() == JobStatus.FAILED)
|| (status.getRunState() == JobStatus.KILLED)) {
v.add(jip);
}
}
return v;
}
public synchronized List<JobInProgress> getFailedJobs() {
synchronized (jobs) {
return failedJobs();
}
}
public Vector<JobInProgress> completedJobs() {
Vector<JobInProgress> v = new Vector<JobInProgress>();
for (Iterator it = jobs.values().iterator(); it.hasNext();) {
JobInProgress jip = (JobInProgress) it.next();
JobStatus status = jip.getStatus();
if (status.getRunState() == JobStatus.SUCCEEDED) {
v.add(jip);
}
}
return v;
}
public synchronized List<JobInProgress> getCompletedJobs() {
synchronized (jobs) {
return completedJobs();
}
}
/**
* Get all the task trackers in the cluster
*
* @return {@link Collection} of {@link TaskTrackerStatus}
*/
// lock to taskTrackers should hold JT lock first.
public synchronized Collection<TaskTrackerStatus> taskTrackers() {
Collection<TaskTrackerStatus> ttStatuses;
synchronized (taskTrackers) {
ttStatuses =
new ArrayList<TaskTrackerStatus>(taskTrackers.values().size());
for (TaskTracker tt : taskTrackers.values()) {
ttStatuses.add(tt.getStatus());
}
}
return ttStatuses;
}
/**
* Get the active task tracker statuses in the cluster
*
* @return {@link Collection} of active {@link TaskTrackerStatus}
*/
// This method is synchronized to make sure that the locking order
// "taskTrackers lock followed by faultyTrackers.potentiallyFaultyTrackers
// lock" is under JobTracker lock to avoid deadlocks.
synchronized public Collection<TaskTrackerStatus> activeTaskTrackers() {
Collection<TaskTrackerStatus> activeTrackers =
new ArrayList<TaskTrackerStatus>();
synchronized (taskTrackers) {
for ( TaskTracker tt : taskTrackers.values()) {
TaskTrackerStatus status = tt.getStatus();
if (!faultyTrackers.isBlacklisted(status.getHost())) {
activeTrackers.add(status);
}
}
}
return activeTrackers;
}
/**
* Get the active and blacklisted task tracker names in the cluster. The first
* element in the returned list contains the list of active tracker names.
* The second element in the returned list contains the list of blacklisted
* tracker names.
*/
// This method is synchronized to make sure that the locking order
// "taskTrackers lock followed by faultyTrackers.potentiallyFaultyTrackers
// lock" is under JobTracker lock to avoid deadlocks.
synchronized public List<List<String>> taskTrackerNames() {
List<String> activeTrackers =
new ArrayList<String>();
List<String> blacklistedTrackers =
new ArrayList<String>();
synchronized (taskTrackers) {
for (TaskTracker tt : taskTrackers.values()) {
TaskTrackerStatus status = tt.getStatus();
if (!faultyTrackers.isBlacklisted(status.getHost())) {
activeTrackers.add(status.getTrackerName());
} else {
blacklistedTrackers.add(status.getTrackerName());
}
}
}
List<List<String>> result = new ArrayList<List<String>>(2);
result.add(activeTrackers);
result.add(blacklistedTrackers);
return result;
}
/**
* Get the blacklisted task tracker statuses in the cluster
*
* @return {@link Collection} of blacklisted {@link TaskTrackerStatus}
*/
// This method is synchronized to make sure that the locking order
// "taskTrackers lock followed by faultyTrackers.potentiallyFaultyTrackers
// lock" is under JobTracker lock to avoid deadlocks.
synchronized public Collection<TaskTrackerStatus> blacklistedTaskTrackers() {
Collection<TaskTrackerStatus> blacklistedTrackers =
new ArrayList<TaskTrackerStatus>();
synchronized (taskTrackers) {
for (TaskTracker tt : taskTrackers.values()) {
TaskTrackerStatus status = tt.getStatus();
if (faultyTrackers.isBlacklisted(status.getHost())) {
blacklistedTrackers.add(status);
}
}
}
return blacklistedTrackers;
}
synchronized int getFaultCount(String hostName) {
return faultyTrackers.getFaultCount(hostName);
}
/**
* Get the number of blacklisted trackers across all the jobs
*
* @return
*/
int getBlacklistedTrackerCount() {
return faultyTrackers.numBlacklistedTrackers;
}
/**
* Whether the tracker is blacklisted or not
*
* @param trackerID
*
* @return true if blacklisted, false otherwise
*/
synchronized public boolean isBlacklisted(String trackerID) {
TaskTrackerStatus status = getTaskTrackerStatus(trackerID);
if (status != null) {
return faultyTrackers.isBlacklisted(status.getHost());
}
return false;
}
// lock to taskTrackers should hold JT lock first.
synchronized public TaskTrackerStatus getTaskTrackerStatus(String trackerID) {
TaskTracker taskTracker;
synchronized (taskTrackers) {
taskTracker = taskTrackers.get(trackerID);
}
return (taskTracker == null) ? null : taskTracker.getStatus();
}
// lock to taskTrackers should hold JT lock first.
synchronized public TaskTracker getTaskTracker(String trackerID) {
synchronized (taskTrackers) {
return taskTrackers.get(trackerID);
}
}
JobTrackerStatistics getStatistics() {
return statistics;
}
/**
* Adds a new node to the jobtracker. It involves adding it to the expiry
* thread and adding it for resolution
*
* Assumes JobTracker, taskTrackers and trackerExpiryQueue is locked on entry
*
* @param status Task Tracker's status
*/
private void addNewTracker(TaskTracker taskTracker) {
TaskTrackerStatus status = taskTracker.getStatus();
trackerExpiryQueue.add(status);
// Register the tracker if its not registered
String hostname = status.getHost();
if (getNode(status.getTrackerName()) == null) {
// Making the network location resolution inline ..
resolveAndAddToTopology(hostname);
}
// add it to the set of tracker per host
Set<TaskTracker> trackers = hostnameToTaskTracker.get(hostname);
if (trackers == null) {
trackers = Collections.synchronizedSet(new HashSet<TaskTracker>());
hostnameToTaskTracker.put(hostname, trackers);
}
statistics.taskTrackerAdded(status.getTrackerName());
getInstrumentation().addTrackers(1);
LOG.info("Adding tracker " + status.getTrackerName() + " to host "
+ hostname);
trackers.add(taskTracker);
}
public Node resolveAndAddToTopology(String name) {
List <String> tmpList = new ArrayList<String>(1);
tmpList.add(name);
List <String> rNameList = dnsToSwitchMapping.resolve(tmpList);
String rName = rNameList.get(0);
String networkLoc = NodeBase.normalize(rName);
return addHostToNodeMapping(name, networkLoc);
}
private Node addHostToNodeMapping(String host, String networkLoc) {
Node node = null;
synchronized (nodesAtMaxLevel) {
if ((node = clusterMap.getNode(networkLoc+"/"+host)) == null) {
node = new NodeBase(host, networkLoc);
clusterMap.add(node);
if (node.getLevel() < getNumTaskCacheLevels()) {
LOG.fatal("Got a host whose level is: " + node.getLevel() + "."
+ " Should get at least a level of value: "
+ getNumTaskCacheLevels());
try {
stopTracker();
} catch (IOException ie) {
LOG.warn("Exception encountered during shutdown: "
+ StringUtils.stringifyException(ie));
System.exit(-1);
}
}
hostnameToNodeMap.put(host, node);
// Make an entry for the node at the max level in the cache
nodesAtMaxLevel.add(getParentNode(node, getNumTaskCacheLevels() - 1));
}
}
return node;
}
/**
* Returns a collection of nodes at the max level
*/
public Collection<Node> getNodesAtMaxLevel() {
return nodesAtMaxLevel;
}
public static Node getParentNode(Node node, int level) {
for (int i = 0; i < level; ++i) {
node = node.getParent();
}
return node;
}
/**
* Return the Node in the network topology that corresponds to the hostname
*/
public Node getNode(String name) {
return hostnameToNodeMap.get(name);
}
public int getNumTaskCacheLevels() {
return numTaskCacheLevels;
}
public int getNumResolvedTaskTrackers() {
return numResolved;
}
public int getNumberOfUniqueHosts() {
return uniqueHostsMap.size();
}
public void addJobInProgressListener(JobInProgressListener listener) {
jobInProgressListeners.add(listener);
}
public void removeJobInProgressListener(JobInProgressListener listener) {
jobInProgressListeners.remove(listener);
}
// Update the listeners about the job
// Assuming JobTracker is locked on entry.
private void updateJobInProgressListeners(JobChangeEvent event) {
for (JobInProgressListener listener : jobInProgressListeners) {
listener.jobUpdated(event);
}
}
/**
* Return the {@link QueueManager} associated with the JobTracker.
*/
public QueueManager getQueueManager() {
return queueManager;
}
////////////////////////////////////////////////////
// InterTrackerProtocol
////////////////////////////////////////////////////
public String getBuildVersion() throws IOException{
return VersionInfo.getBuildVersion();
}
/**
* The periodic heartbeat mechanism between the {@link TaskTracker} and
* the {@link JobTracker}.
*
* The {@link JobTracker} processes the status information sent by the
* {@link TaskTracker} and responds with instructions to start/stop
* tasks or jobs, and also 'reset' instructions during contingencies.
*/
public synchronized HeartbeatResponse heartbeat(TaskTrackerStatus status,
boolean restarted,
boolean initialContact,
boolean acceptNewTasks,
short responseId)
throws IOException {
if (LOG.isDebugEnabled()) {
LOG.debug("Got heartbeat from: " + status.getTrackerName() +
" (restarted: " + restarted +
" initialContact: " + initialContact +
" acceptNewTasks: " + acceptNewTasks + ")" +
" with responseId: " + responseId);
}
// Make sure heartbeat is from a tasktracker allowed by the jobtracker.
if (!acceptTaskTracker(status)) {
throw new DisallowedTaskTrackerException(status);
}
// First check if the last heartbeat response got through
String trackerName = status.getTrackerName();
long now = clock.getTime();
boolean isBlacklisted = false;
if (restarted) {
faultyTrackers.markTrackerHealthy(status.getHost());
} else {
isBlacklisted =
faultyTrackers.shouldAssignTasksToTracker(status.getHost(), now);
}
HeartbeatResponse prevHeartbeatResponse =
trackerToHeartbeatResponseMap.get(trackerName);
boolean addRestartInfo = false;
if (initialContact != true) {
// If this isn't the 'initial contact' from the tasktracker,
// there is something seriously wrong if the JobTracker has
// no record of the 'previous heartbeat'; if so, ask the
// tasktracker to re-initialize itself.
if (prevHeartbeatResponse == null) {
// This is the first heartbeat from the old tracker to the newly
// started JobTracker
if (hasRestarted()) {
addRestartInfo = true;
// inform the recovery manager about this tracker joining back
recoveryManager.unMarkTracker(trackerName);
} else {
// Jobtracker might have restarted but no recovery is needed
// otherwise this code should not be reached
LOG.warn("Serious problem, cannot find record of 'previous' " +
"heartbeat for '" + trackerName +
"'; reinitializing the tasktracker");
return new HeartbeatResponse(responseId,
new TaskTrackerAction[] {new ReinitTrackerAction()});
}
} else {
// It is completely safe to not process a 'duplicate' heartbeat from a
// {@link TaskTracker} since it resends the heartbeat when rpcs are
// lost see {@link TaskTracker.transmitHeartbeat()};
// acknowledge it by re-sending the previous response to let the
// {@link TaskTracker} go forward.
if (prevHeartbeatResponse.getResponseId() != responseId) {
LOG.info("Ignoring 'duplicate' heartbeat from '" +
trackerName + "'; resending the previous 'lost' response");
return prevHeartbeatResponse;
}
}
}
// Process this heartbeat
short newResponseId = (short)(responseId + 1);
status.setLastSeen(now);
if (!processHeartbeat(status, initialContact)) {
if (prevHeartbeatResponse != null) {
trackerToHeartbeatResponseMap.remove(trackerName);
}
return new HeartbeatResponse(newResponseId,
new TaskTrackerAction[] {new ReinitTrackerAction()});
}
// Initialize the response to be sent for the heartbeat
HeartbeatResponse response = new HeartbeatResponse(newResponseId, null);
List<TaskTrackerAction> actions = new ArrayList<TaskTrackerAction>();
isBlacklisted = faultyTrackers.isBlacklisted(status.getHost());
// Check for new tasks to be executed on the tasktracker
if (recoveryManager.shouldSchedule() && acceptNewTasks && !isBlacklisted) {
TaskTrackerStatus taskTrackerStatus = getTaskTrackerStatus(trackerName) ;
if (taskTrackerStatus == null) {
LOG.warn("Unknown task tracker polling; ignoring: " + trackerName);
} else {
List<Task> tasks = getSetupAndCleanupTasks(taskTrackerStatus);
if (tasks == null ) {
tasks = taskScheduler.assignTasks(taskTrackers.get(trackerName));
}
if (tasks != null) {
for (Task task : tasks) {
expireLaunchingTasks.addNewTask(task.getTaskID());
if(LOG.isDebugEnabled()) {
LOG.debug(trackerName + " -> LaunchTask: " + task.getTaskID());
}
actions.add(new LaunchTaskAction(task));
}
}
}
}
// Check for tasks to be killed
List<TaskTrackerAction> killTasksList = getTasksToKill(trackerName);
if (killTasksList != null) {
actions.addAll(killTasksList);
}
// Check for jobs to be killed/cleanedup
List<TaskTrackerAction> killJobsList = getJobsForCleanup(trackerName);
if (killJobsList != null) {
actions.addAll(killJobsList);
}
// Check for tasks whose outputs can be saved
List<TaskTrackerAction> commitTasksList = getTasksToSave(status);
if (commitTasksList != null) {
actions.addAll(commitTasksList);
}
// calculate next heartbeat interval and put in heartbeat response
int nextInterval = getNextHeartbeatInterval();
response.setHeartbeatInterval(nextInterval);
response.setActions(
actions.toArray(new TaskTrackerAction[actions.size()]));
// check if the restart info is req
if (addRestartInfo) {
response.setRecoveredJobs(recoveryManager.getJobsToRecover());
}
// Update the trackerToHeartbeatResponseMap
trackerToHeartbeatResponseMap.put(trackerName, response);
// Done processing the hearbeat, now remove 'marked' tasks
removeMarkedTasks(trackerName);
return response;
}
/**
* Calculates next heartbeat interval using cluster size.
* Heartbeat interval is incremented by 1 second for every 100 nodes by default.
* @return next heartbeat interval.
*/
public int getNextHeartbeatInterval() {
// get the no of task trackers
int clusterSize = getClusterStatus().getTaskTrackers();
int heartbeatInterval = Math.max(
(int)(1000 * HEARTBEATS_SCALING_FACTOR *
Math.ceil((double)clusterSize /
NUM_HEARTBEATS_IN_SECOND)),
HEARTBEAT_INTERVAL_MIN) ;
return heartbeatInterval;
}
/**
* Return if the specified tasktracker is in the hosts list,
* if one was configured. If none was configured, then this
* returns true.
*/
private boolean inHostsList(TaskTrackerStatus status) {
Set<String> hostsList = hostsReader.getHosts();
return (hostsList.isEmpty() || hostsList.contains(status.getHost()));
}
/**
* Return if the specified tasktracker is in the exclude list.
*/
private boolean inExcludedHostsList(TaskTrackerStatus status) {
Set<String> excludeList = hostsReader.getExcludedHosts();
return excludeList.contains(status.getHost());
}
/**
* Returns true if the tasktracker is in the hosts list and
* not in the exclude list.
*/
private boolean acceptTaskTracker(TaskTrackerStatus status) {
return (inHostsList(status) && !inExcludedHostsList(status));
}
/**
* Update the last recorded status for the given task tracker.
* It assumes that the taskTrackers are locked on entry.
* @param trackerName The name of the tracker
* @param status The new status for the task tracker
* @return Was an old status found?
*/
private boolean updateTaskTrackerStatus(String trackerName,
TaskTrackerStatus status) {
TaskTracker tt = getTaskTracker(trackerName);
TaskTrackerStatus oldStatus = (tt == null) ? null : tt.getStatus();
if (oldStatus != null) {
totalMaps -= oldStatus.countMapTasks();
totalReduces -= oldStatus.countReduceTasks();
occupiedMapSlots -= oldStatus.countOccupiedMapSlots();
occupiedReduceSlots -= oldStatus.countOccupiedReduceSlots();
getInstrumentation().decRunningMaps(oldStatus.countMapTasks());
getInstrumentation().decRunningReduces(oldStatus.countReduceTasks());
getInstrumentation().decOccupiedMapSlots(oldStatus.countOccupiedMapSlots());
getInstrumentation().decOccupiedReduceSlots(oldStatus.countOccupiedReduceSlots());
if (!faultyTrackers.isBlacklisted(oldStatus.getHost())) {
int mapSlots = oldStatus.getMaxMapSlots();
totalMapTaskCapacity -= mapSlots;
int reduceSlots = oldStatus.getMaxReduceSlots();
totalReduceTaskCapacity -= reduceSlots;
}
if (status == null) {
taskTrackers.remove(trackerName);
Integer numTaskTrackersInHost =
uniqueHostsMap.get(oldStatus.getHost());
if (numTaskTrackersInHost != null) {
numTaskTrackersInHost --;
if (numTaskTrackersInHost > 0) {
uniqueHostsMap.put(oldStatus.getHost(), numTaskTrackersInHost);
}
else {
uniqueHostsMap.remove(oldStatus.getHost());
}
}
}
}
if (status != null) {
totalMaps += status.countMapTasks();
totalReduces += status.countReduceTasks();
occupiedMapSlots += status.countOccupiedMapSlots();
occupiedReduceSlots += status.countOccupiedReduceSlots();
getInstrumentation().addRunningMaps(status.countMapTasks());
getInstrumentation().addRunningReduces(status.countReduceTasks());
getInstrumentation().addOccupiedMapSlots(status.countOccupiedMapSlots());
getInstrumentation().addOccupiedReduceSlots(status.countOccupiedReduceSlots());
if (!faultyTrackers.isBlacklisted(status.getHost())) {
int mapSlots = status.getMaxMapSlots();
totalMapTaskCapacity += mapSlots;
int reduceSlots = status.getMaxReduceSlots();
totalReduceTaskCapacity += reduceSlots;
}
boolean alreadyPresent = false;
TaskTracker taskTracker = taskTrackers.get(trackerName);
if (taskTracker != null) {
alreadyPresent = true;
} else {
taskTracker = new TaskTracker(trackerName);
}
taskTracker.setStatus(status);
taskTrackers.put(trackerName, taskTracker);
if (LOG.isDebugEnabled()) {
int runningMaps = 0, runningReduces = 0;
int commitPendingMaps = 0, commitPendingReduces = 0;
int unassignedMaps = 0, unassignedReduces = 0;
int miscMaps = 0, miscReduces = 0;
List<TaskStatus> taskReports = status.getTaskReports();
for (Iterator<TaskStatus> it = taskReports.iterator(); it.hasNext();) {
TaskStatus ts = (TaskStatus) it.next();
boolean isMap = ts.getIsMap();
TaskStatus.State state = ts.getRunState();
if (state == TaskStatus.State.RUNNING) {
if (isMap) { ++runningMaps; }
else { ++runningReduces; }
} else if (state == TaskStatus.State.UNASSIGNED) {
if (isMap) { ++unassignedMaps; }
else { ++unassignedReduces; }
} else if (state == TaskStatus.State.COMMIT_PENDING) {
if (isMap) { ++commitPendingMaps; }
else { ++commitPendingReduces; }
} else {
if (isMap) { ++miscMaps; }
else { ++miscReduces; }
}
}
LOG.debug(trackerName + ": Status -" +
" running(m) = " + runningMaps +
" unassigned(m) = " + unassignedMaps +
" commit_pending(m) = " + commitPendingMaps +
" misc(m) = " + miscMaps +
" running(r) = " + runningReduces +
" unassigned(r) = " + unassignedReduces +
" commit_pending(r) = " + commitPendingReduces +
" misc(r) = " + miscReduces);
}
if (!alreadyPresent) {
Integer numTaskTrackersInHost =
uniqueHostsMap.get(status.getHost());
if (numTaskTrackersInHost == null) {
numTaskTrackersInHost = 0;
}
numTaskTrackersInHost ++;
uniqueHostsMap.put(status.getHost(), numTaskTrackersInHost);
}
}
getInstrumentation().setMapSlots(totalMapTaskCapacity);
getInstrumentation().setReduceSlots(totalReduceTaskCapacity);
return oldStatus != null;
}
// Increment the number of reserved slots in the cluster.
// This method assumes the caller has JobTracker lock.
void incrementReservations(TaskType type, int reservedSlots) {
if (type.equals(TaskType.MAP)) {
reservedMapSlots += reservedSlots;
} else if (type.equals(TaskType.REDUCE)) {
reservedReduceSlots += reservedSlots;
}
}
// Decrement the number of reserved slots in the cluster.
// This method assumes the caller has JobTracker lock.
void decrementReservations(TaskType type, int reservedSlots) {
if (type.equals(TaskType.MAP)) {
reservedMapSlots -= reservedSlots;
} else if (type.equals(TaskType.REDUCE)) {
reservedReduceSlots -= reservedSlots;
}
}
private void updateNodeHealthStatus(TaskTrackerStatus trackerStatus) {
TaskTrackerHealthStatus status = trackerStatus.getHealthStatus();
synchronized (faultyTrackers) {
faultyTrackers.setNodeHealthStatus(trackerStatus.getHost(),
status.isNodeHealthy(), status.getHealthReport());
}
}
/**
* Process incoming heartbeat messages from the task trackers.
*/
private synchronized boolean processHeartbeat(
TaskTrackerStatus trackerStatus,
boolean initialContact) {
getInstrumentation().heartbeat();
String trackerName = trackerStatus.getTrackerName();
synchronized (taskTrackers) {
synchronized (trackerExpiryQueue) {
boolean seenBefore = updateTaskTrackerStatus(trackerName,
trackerStatus);
TaskTracker taskTracker = getTaskTracker(trackerName);
if (initialContact) {
// If it's first contact, then clear out
// any state hanging around
if (seenBefore) {
lostTaskTracker(taskTracker);
}
} else {
// If not first contact, there should be some record of the tracker
if (!seenBefore) {
LOG.warn("Status from unknown Tracker : " + trackerName);
updateTaskTrackerStatus(trackerName, null);
return false;
}
}
if (initialContact) {
// if this is lost tracker that came back now, and if it blacklisted
// increment the count of blacklisted trackers in the cluster
if (isBlacklisted(trackerName)) {
faultyTrackers.incrBlackListedTrackers(1);
}
addNewTracker(taskTracker);
}
}
}
updateTaskStatuses(trackerStatus);
updateNodeHealthStatus(trackerStatus);
return true;
}
/**
* A tracker wants to know if any of its Tasks have been
* closed (because the job completed, whether successfully or not)
*/
private synchronized List<TaskTrackerAction> getTasksToKill(
String taskTracker) {
Set<TaskAttemptID> taskIds = trackerToTaskMap.get(taskTracker);
List<TaskTrackerAction> killList = new ArrayList<TaskTrackerAction>();
if (taskIds != null) {
for (TaskAttemptID killTaskId : taskIds) {
TaskInProgress tip = taskidToTIPMap.get(killTaskId);
if (tip == null) {
continue;
}
if (tip.shouldClose(killTaskId)) {
//
// This is how the JobTracker ends a task at the TaskTracker.
// It may be successfully completed, or may be killed in
// mid-execution.
//
if (!tip.getJob().isComplete()) {
killList.add(new KillTaskAction(killTaskId));
if (LOG.isDebugEnabled()) {
LOG.debug(taskTracker + " -> KillTaskAction: " + killTaskId);
}
}
}
}
}
// add the stray attempts for uninited jobs
synchronized (trackerToTasksToCleanup) {
Set<TaskAttemptID> set = trackerToTasksToCleanup.remove(taskTracker);
if (set != null) {
for (TaskAttemptID id : set) {
killList.add(new KillTaskAction(id));
}
}
}
return killList;
}
/**
* Add a job to cleanup for the tracker.
*/
private void addJobForCleanup(JobID id) {
for (String taskTracker : taskTrackers.keySet()) {
if (LOG.isDebugEnabled()) {
LOG.debug("Marking job " + id + " for cleanup by tracker " + taskTracker);
}
synchronized (trackerToJobsToCleanup) {
Set<JobID> jobsToKill = trackerToJobsToCleanup.get(taskTracker);
if (jobsToKill == null) {
jobsToKill = new HashSet<JobID>();
trackerToJobsToCleanup.put(taskTracker, jobsToKill);
}
jobsToKill.add(id);
}
}
}
/**
* A tracker wants to know if any job needs cleanup because the job completed.
*/
private List<TaskTrackerAction> getJobsForCleanup(String taskTracker) {
Set<JobID> jobs = null;
synchronized (trackerToJobsToCleanup) {
jobs = trackerToJobsToCleanup.remove(taskTracker);
}
if (jobs != null) {
// prepare the actions list
List<TaskTrackerAction> killList = new ArrayList<TaskTrackerAction>();
for (JobID killJobId : jobs) {
killList.add(new KillJobAction(killJobId));
if(LOG.isDebugEnabled()) {
LOG.debug(taskTracker + " -> KillJobAction: " + killJobId);
}
}
return killList;
}
return null;
}
/**
* A tracker wants to know if any of its Tasks can be committed
*/
private synchronized List<TaskTrackerAction> getTasksToSave(
TaskTrackerStatus tts) {
List<TaskStatus> taskStatuses = tts.getTaskReports();
if (taskStatuses != null) {
List<TaskTrackerAction> saveList = new ArrayList<TaskTrackerAction>();
for (TaskStatus taskStatus : taskStatuses) {
if (taskStatus.getRunState() == TaskStatus.State.COMMIT_PENDING) {
TaskAttemptID taskId = taskStatus.getTaskID();
TaskInProgress tip = taskidToTIPMap.get(taskId);
if (tip == null) {
continue;
}
if (tip.shouldCommit(taskId)) {
saveList.add(new CommitTaskAction(taskId));
if (LOG.isDebugEnabled()) {
LOG.debug(tts.getTrackerName() +
" -> CommitTaskAction: " + taskId);
}
}
}
}
return saveList;
}
return null;
}
// returns cleanup tasks first, then setup tasks.
synchronized List<Task> getSetupAndCleanupTasks(
TaskTrackerStatus taskTracker) throws IOException {
int maxMapTasks = taskTracker.getMaxMapSlots();
int maxReduceTasks = taskTracker.getMaxReduceSlots();
int numMaps = taskTracker.countOccupiedMapSlots();
int numReduces = taskTracker.countOccupiedReduceSlots();
int numTaskTrackers = getClusterStatus().getTaskTrackers();
int numUniqueHosts = getNumberOfUniqueHosts();
Task t = null;
synchronized (jobs) {
if (numMaps < maxMapTasks) {
for (Iterator<JobInProgress> it = jobs.values().iterator();
it.hasNext();) {
JobInProgress job = it.next();
t = job.obtainJobCleanupTask(taskTracker, numTaskTrackers,
numUniqueHosts, true);
if (t != null) {
return Collections.singletonList(t);
}
}
for (Iterator<JobInProgress> it = jobs.values().iterator();
it.hasNext();) {
JobInProgress job = it.next();
t = job.obtainTaskCleanupTask(taskTracker, true);
if (t != null) {
return Collections.singletonList(t);
}
}
for (Iterator<JobInProgress> it = jobs.values().iterator();
it.hasNext();) {
JobInProgress job = it.next();
t = job.obtainJobSetupTask(taskTracker, numTaskTrackers,
numUniqueHosts, true);
if (t != null) {
return Collections.singletonList(t);
}
}
}
if (numReduces < maxReduceTasks) {
for (Iterator<JobInProgress> it = jobs.values().iterator();
it.hasNext();) {
JobInProgress job = it.next();
t = job.obtainJobCleanupTask(taskTracker, numTaskTrackers,
numUniqueHosts, false);
if (t != null) {
return Collections.singletonList(t);
}
}
for (Iterator<JobInProgress> it = jobs.values().iterator();
it.hasNext();) {
JobInProgress job = it.next();
t = job.obtainTaskCleanupTask(taskTracker, false);
if (t != null) {
return Collections.singletonList(t);
}
}
for (Iterator<JobInProgress> it = jobs.values().iterator();
it.hasNext();) {
JobInProgress job = it.next();
t = job.obtainJobSetupTask(taskTracker, numTaskTrackers,
numUniqueHosts, false);
if (t != null) {
return Collections.singletonList(t);
}
}
}
}
return null;
}
/**
* Grab the local fs name
*/
public synchronized String getFilesystemName() throws IOException {
if (fs == null) {
throw new IllegalStateException("FileSystem object not available yet");
}
return fs.getUri().toString();
}
/**
* Returns a handle to the JobTracker's Configuration
*/
public JobConf getConf() {
return conf;
}
public void reportTaskTrackerError(String taskTracker,
String errorClass,
String errorMessage) throws IOException {
LOG.warn("Report from " + taskTracker + ": " + errorMessage);
}
/**
* Remove the job_ from jobids to get the unique string.
*/
static String getJobUniqueString(String jobid) {
return jobid.substring(4);
}
////////////////////////////////////////////////////
// JobSubmissionProtocol
////////////////////////////////////////////////////
/**
* Allocates a new JobId string.
*/
public synchronized JobID getNewJobId() throws IOException {
return new JobID(getTrackerIdentifier(), nextJobId++);
}
/**
* JobTracker.submitJob() kicks off a new job.
*
* Create a 'JobInProgress' object, which contains both JobProfile
* and JobStatus. Those two sub-objects are sometimes shipped outside
* of the JobTracker. But JobInProgress adds info that's useful for
* the JobTracker alone.
*/
public JobStatus submitJob(JobID jobId, String jobSubmitDir, Credentials ts)
throws IOException {
JobInfo jobInfo = null;
UserGroupInformation ugi = UserGroupInformation.getCurrentUser();
synchronized (this) {
if (jobs.containsKey(jobId)) {
// job already running, don't start twice
return jobs.get(jobId).getStatus();
}
jobInfo = new JobInfo(jobId, new Text(ugi.getShortUserName()),
new Path(jobSubmitDir));
}
// Create the JobInProgress, do not lock the JobTracker since
// we are about to copy job.xml from HDFS
JobInProgress job = null;
try {
job = new JobInProgress(this, this.conf, jobInfo, 0, ts);
} catch (Exception e) {
throw new IOException(e);
}
synchronized (this) {
String queue = job.getProfile().getQueueName();
if (!(queueManager.getQueues().contains(queue))) {
job.fail();
throw new IOException("Queue \"" + queue + "\" does not exist");
}
// check for access
try {
aclsManager.checkAccess(job, ugi, Operation.SUBMIT_JOB);
} catch (IOException ioe) {
LOG.warn("Access denied for user " + job.getJobConf().getUser()
+ ". Ignoring job " + jobId, ioe);
job.fail();
throw ioe;
}
// Check the job if it cannot run in the cluster because of invalid memory
// requirements.
try {
checkMemoryRequirements(job);
} catch (IOException ioe) {
throw ioe;
}
boolean recovered = true; // TODO: Once the Job recovery code is there,
// (MAPREDUCE-873) we
// must pass the "recovered" flag accurately.
// This is handled in the trunk/0.22
if (!recovered) {
// Store the information in a file so that the job can be recovered
// later (if at all)
Path jobDir = getSystemDirectoryForJob(jobId);
FileSystem.mkdirs(fs, jobDir, new FsPermission(SYSTEM_DIR_PERMISSION));
FSDataOutputStream out = fs.create(getSystemFileForJob(jobId));
jobInfo.write(out);
out.close();
}
return addJob(jobId, job);
}
}
/**
* @see org.apache.hadoop.mapred.JobSubmissionProtocol#getStagingAreaDir()
*/
public String getStagingAreaDir() throws IOException {
try{
final String user =
UserGroupInformation.getCurrentUser().getShortUserName();
return getMROwner().doAs(new PrivilegedExceptionAction<String>() {
@Override
public String run() throws Exception {
return getStagingAreaDirInternal(user);
}
});
} catch(InterruptedException ie) {
throw new IOException(ie);
}
}
private String getStagingAreaDirInternal(String user) throws IOException {
final Path stagingRootDir =
new Path(conf.get("mapreduce.jobtracker.staging.root.dir",
"/tmp/hadoop/mapred/staging"));
final FileSystem fs = stagingRootDir.getFileSystem(conf);
return fs.makeQualified(new Path(stagingRootDir,
user+"/.staging")).toString();
}
/**
* Adds a job to the jobtracker. Make sure that the checks are inplace before
* adding a job. This is the core job submission logic
* @param jobId The id for the job submitted which needs to be added
*/
private synchronized JobStatus addJob(JobID jobId, JobInProgress job) {
totalSubmissions++;
synchronized (jobs) {
synchronized (taskScheduler) {
jobs.put(job.getProfile().getJobID(), job);
for (JobInProgressListener listener : jobInProgressListeners) {
try {
listener.jobAdded(job);
} catch (IOException ioe) {
LOG.warn("Failed to add and so skipping the job : "
+ job.getJobID() + ". Exception : " + ioe);
}
}
}
}
myInstrumentation.submitJob(job.getJobConf(), jobId);
LOG.info("Job " + jobId + " added successfully for user '"
+ job.getJobConf().getUser() + "' to queue '"
+ job.getJobConf().getQueueName() + "'");
AuditLogger.logSuccess(job.getUser(),
Operation.SUBMIT_JOB.name(), jobId.toString());
return job.getStatus();
}
/**
* Are ACLs for authorization checks enabled on the JT?
*
* @return
*/
boolean areACLsEnabled() {
return conf.getBoolean(JobConf.MR_ACLS_ENABLED, false);
}
/**@deprecated use {@link #getClusterStatus(boolean)}*/
@Deprecated
public synchronized ClusterStatus getClusterStatus() {
return getClusterStatus(false);
}
public synchronized ClusterStatus getClusterStatus(boolean detailed) {
synchronized (taskTrackers) {
if (detailed) {
List<List<String>> trackerNames = taskTrackerNames();
return new ClusterStatus(trackerNames.get(0),
trackerNames.get(1),
TASKTRACKER_EXPIRY_INTERVAL,
totalMaps,
totalReduces,
totalMapTaskCapacity,
totalReduceTaskCapacity,
state, getExcludedNodes().size()
);
} else {
return new ClusterStatus(taskTrackers.size() -
getBlacklistedTrackerCount(),
getBlacklistedTrackerCount(),
TASKTRACKER_EXPIRY_INTERVAL,
totalMaps,
totalReduces,
totalMapTaskCapacity,
totalReduceTaskCapacity,
state, getExcludedNodes().size());
}
}
}
public synchronized ClusterMetrics getClusterMetrics() {
return new ClusterMetrics(totalMaps,
totalReduces, occupiedMapSlots, occupiedReduceSlots,
reservedMapSlots, reservedReduceSlots,
totalMapTaskCapacity, totalReduceTaskCapacity,
totalSubmissions,
taskTrackers.size() - getBlacklistedTrackerCount(),
getBlacklistedTrackerCount(), getExcludedNodes().size()) ;
}
/**
* @see JobSubmissionProtocol#killJob
*/
public synchronized void killJob(JobID jobid) throws IOException {
if (null == jobid) {
LOG.info("Null jobid object sent to JobTracker.killJob()");
return;
}
JobInProgress job = jobs.get(jobid);
if (null == job) {
LOG.info("killJob(): JobId " + jobid.toString() + " is not a valid job");
return;
}
// check both queue-level and job-level access
aclsManager.checkAccess(job, UserGroupInformation.getCurrentUser(),
Operation.KILL_JOB);
killJob(job);
}
private synchronized void killJob(JobInProgress job) {
LOG.info("Killing job " + job.getJobID());
JobStatus prevStatus = (JobStatus)job.getStatus().clone();
job.kill();
// Inform the listeners if the job is killed
// Note :
// If the job is killed in the PREP state then the listeners will be
// invoked
// If the job is killed in the RUNNING state then cleanup tasks will be
// launched and the updateTaskStatuses() will take care of it
JobStatus newStatus = (JobStatus)job.getStatus().clone();
if (prevStatus.getRunState() != newStatus.getRunState()
&& newStatus.getRunState() == JobStatus.KILLED) {
JobStatusChangeEvent event =
new JobStatusChangeEvent(job, EventType.RUN_STATE_CHANGED, prevStatus,
newStatus);
updateJobInProgressListeners(event);
}
}
/**
* Discard a current delegation token.
*/
@Override
public void cancelDelegationToken(Token<DelegationTokenIdentifier> token
) throws IOException,
InterruptedException {
String user = UserGroupInformation.getCurrentUser().getUserName();
secretManager.cancelToken(token, user);
}
/**
* Get a new delegation token.
*/
@Override
public Token<DelegationTokenIdentifier>
getDelegationToken(Text renewer
)throws IOException, InterruptedException {
if (!isAllowedDelegationTokenOp()) {
throw new IOException(
"Delegation Token can be issued only with kerberos authentication");
}
UserGroupInformation ugi = UserGroupInformation.getCurrentUser();
Text owner = new Text(ugi.getUserName());
Text realUser = null;
if (ugi.getRealUser() != null) {
realUser = new Text(ugi.getRealUser().getUserName());
}
DelegationTokenIdentifier ident =
new DelegationTokenIdentifier(owner, renewer, realUser);
return new Token<DelegationTokenIdentifier>(ident, secretManager);
}
/**
* Renew a delegation token to extend its lifetime.
*/
@Override
public long renewDelegationToken(Token<DelegationTokenIdentifier> token
) throws IOException,
InterruptedException {
if (!isAllowedDelegationTokenOp()) {
throw new IOException(
"Delegation Token can be issued only with kerberos authentication");
}
String user = UserGroupInformation.getCurrentUser().getUserName();
return secretManager.renewToken(token, user);
}
public void initJob(JobInProgress job) {
if (null == job) {
LOG.info("Init on null job is not valid");
return;
}
try {
JobStatus prevStatus = (JobStatus)job.getStatus().clone();
LOG.info("Initializing " + job.getJobID());
job.initTasks();
// Inform the listeners if the job state has changed
// Note : that the job will be in PREP state.
JobStatus newStatus = (JobStatus)job.getStatus().clone();
if (prevStatus.getRunState() != newStatus.getRunState()) {
JobStatusChangeEvent event =
new JobStatusChangeEvent(job, EventType.RUN_STATE_CHANGED, prevStatus,
newStatus);
synchronized (JobTracker.this) {
updateJobInProgressListeners(event);
}
}
} catch (KillInterruptedException kie) {
// If job was killed during initialization, job state will be KILLED
LOG.error("Job initialization interrupted:\n" +
StringUtils.stringifyException(kie));
killJob(job);
} catch (Throwable t) {
// If the job initialization is failed, job state will be FAILED
LOG.error("Job initialization failed:\n" +
StringUtils.stringifyException(t));
failJob(job);
}
}
/**
* Fail a job and inform the listeners. Other components in the framework
* should use this to fail a job.
*/
public synchronized void failJob(JobInProgress job) {
if (null == job) {
LOG.info("Fail on null job is not valid");
return;
}
JobStatus prevStatus = (JobStatus)job.getStatus().clone();
LOG.info("Failing job " + job.getJobID());
job.fail();
// Inform the listeners if the job state has changed
JobStatus newStatus = (JobStatus)job.getStatus().clone();
if (prevStatus.getRunState() != newStatus.getRunState()) {
JobStatusChangeEvent event =
new JobStatusChangeEvent(job, EventType.RUN_STATE_CHANGED, prevStatus,
newStatus);
updateJobInProgressListeners(event);
}
}
public synchronized void setJobPriority(JobID jobid,
String priority)
throws IOException {
JobInProgress job = jobs.get(jobid);
if (null == job) {
LOG.info("setJobPriority(): JobId " + jobid.toString()
+ " is not a valid job");
return;
}
JobPriority newPriority = JobPriority.valueOf(priority);
setJobPriority(jobid, newPriority);
}
void storeCompletedJob(JobInProgress job) {
//persists the job info in DFS
completedJobStatusStore.store(job);
}
/**
* Check if the <code>job</code> has been initialized.
*
* @param job {@link JobInProgress} to be checked
* @return <code>true</code> if the job has been initialized,
* <code>false</code> otherwise
*/
private boolean isJobInited(JobInProgress job) {
return job.inited();
}
public JobProfile getJobProfile(JobID jobid) {
synchronized (this) {
JobInProgress job = jobs.get(jobid);
if (job != null) {
// Safe to call JobInProgress.getProfile while holding the lock
// on the JobTracker since it isn't a synchronized method
return job.getProfile();
} else {
RetireJobInfo info = retireJobs.get(jobid);
if (info != null) {
return info.profile;
}
}
}
return completedJobStatusStore.readJobProfile(jobid);
}
public JobStatus getJobStatus(JobID jobid) {
if (null == jobid) {
LOG.warn("JobTracker.getJobStatus() cannot get status for null jobid");
return null;
}
synchronized (this) {
JobInProgress job = jobs.get(jobid);
if (job != null) {
// Safe to call JobInProgress.getStatus while holding the lock
// on the JobTracker since it isn't a synchronized method
return job.getStatus();
} else {
RetireJobInfo info = retireJobs.get(jobid);
if (info != null) {
return info.status;
}
}
}
return completedJobStatusStore.readJobStatus(jobid);
}
private static final Counters EMPTY_COUNTERS = new Counters();
public Counters getJobCounters(JobID jobid) throws IOException {
UserGroupInformation callerUGI = UserGroupInformation.getCurrentUser();
synchronized (this) {
JobInProgress job = jobs.get(jobid);
if (job != null) {
// check the job-access
aclsManager.checkAccess(job, callerUGI, Operation.VIEW_JOB_COUNTERS);
return isJobInited(job) ? job.getCounters() : EMPTY_COUNTERS;
}
}
return completedJobStatusStore.readCounters(jobid);
}
private static final TaskReport[] EMPTY_TASK_REPORTS = new TaskReport[0];
public synchronized TaskReport[] getMapTaskReports(JobID jobid)
throws IOException {
JobInProgress job = jobs.get(jobid);
if (job != null) {
// Check authorization
aclsManager.checkAccess(job, UserGroupInformation.getCurrentUser(),
Operation.VIEW_JOB_DETAILS);
}
if (job == null || !isJobInited(job)) {
return EMPTY_TASK_REPORTS;
} else {
Vector<TaskReport> reports = new Vector<TaskReport>();
Vector<TaskInProgress> completeMapTasks =
job.reportTasksInProgress(true, true);
for (Iterator it = completeMapTasks.iterator(); it.hasNext();) {
TaskInProgress tip = (TaskInProgress) it.next();
reports.add(tip.generateSingleReport());
}
Vector<TaskInProgress> incompleteMapTasks =
job.reportTasksInProgress(true, false);
for (Iterator it = incompleteMapTasks.iterator(); it.hasNext();) {
TaskInProgress tip = (TaskInProgress) it.next();
reports.add(tip.generateSingleReport());
}
return reports.toArray(new TaskReport[reports.size()]);
}
}
public synchronized TaskReport[] getReduceTaskReports(JobID jobid)
throws IOException {
JobInProgress job = jobs.get(jobid);
if (job != null) {
// Check authorization
aclsManager.checkAccess(job, UserGroupInformation.getCurrentUser(),
Operation.VIEW_JOB_DETAILS);
}
if (job == null || !isJobInited(job)) {
return EMPTY_TASK_REPORTS;
} else {
Vector<TaskReport> reports = new Vector<TaskReport>();
Vector completeReduceTasks = job.reportTasksInProgress(false, true);
for (Iterator it = completeReduceTasks.iterator(); it.hasNext();) {
TaskInProgress tip = (TaskInProgress) it.next();
reports.add(tip.generateSingleReport());
}
Vector incompleteReduceTasks = job.reportTasksInProgress(false, false);
for (Iterator it = incompleteReduceTasks.iterator(); it.hasNext();) {
TaskInProgress tip = (TaskInProgress) it.next();
reports.add(tip.generateSingleReport());
}
return reports.toArray(new TaskReport[reports.size()]);
}
}
public synchronized TaskReport[] getCleanupTaskReports(JobID jobid)
throws IOException {
JobInProgress job = jobs.get(jobid);
if (job != null) {
// Check authorization
aclsManager.checkAccess(job, UserGroupInformation.getCurrentUser(),
Operation.VIEW_JOB_DETAILS);
}
if (job == null || !isJobInited(job)) {
return EMPTY_TASK_REPORTS;
} else {
Vector<TaskReport> reports = new Vector<TaskReport>();
Vector<TaskInProgress> completeTasks = job.reportCleanupTIPs(true);
for (Iterator<TaskInProgress> it = completeTasks.iterator();
it.hasNext();) {
TaskInProgress tip = it.next();
reports.add(tip.generateSingleReport());
}
Vector<TaskInProgress> incompleteTasks = job.reportCleanupTIPs(false);
for (Iterator<TaskInProgress> it = incompleteTasks.iterator();
it.hasNext();) {
TaskInProgress tip = it.next();
reports.add(tip.generateSingleReport());
}
return reports.toArray(new TaskReport[reports.size()]);
}
}
public synchronized TaskReport[] getSetupTaskReports(JobID jobid)
throws IOException {
JobInProgress job = jobs.get(jobid);
if (job != null) {
// Check authorization
aclsManager.checkAccess(job, UserGroupInformation.getCurrentUser(),
Operation.VIEW_JOB_DETAILS);
}
if (job == null || !isJobInited(job)) {
return EMPTY_TASK_REPORTS;
} else {
Vector<TaskReport> reports = new Vector<TaskReport>();
Vector<TaskInProgress> completeTasks = job.reportSetupTIPs(true);
for (Iterator<TaskInProgress> it = completeTasks.iterator();
it.hasNext();) {
TaskInProgress tip = it.next();
reports.add(tip.generateSingleReport());
}
Vector<TaskInProgress> incompleteTasks = job.reportSetupTIPs(false);
for (Iterator<TaskInProgress> it = incompleteTasks.iterator();
it.hasNext();) {
TaskInProgress tip = it.next();
reports.add(tip.generateSingleReport());
}
return reports.toArray(new TaskReport[reports.size()]);
}
}
static final String MAPRED_CLUSTER_MAP_MEMORY_MB_PROPERTY =
"mapred.cluster.map.memory.mb";
static final String MAPRED_CLUSTER_REDUCE_MEMORY_MB_PROPERTY =
"mapred.cluster.reduce.memory.mb";
static final String MAPRED_CLUSTER_MAX_MAP_MEMORY_MB_PROPERTY =
"mapred.cluster.max.map.memory.mb";
static final String MAPRED_CLUSTER_MAX_REDUCE_MEMORY_MB_PROPERTY =
"mapred.cluster.max.reduce.memory.mb";
/*
* Returns a list of TaskCompletionEvent for the given job,
* starting from fromEventId.
* @see org.apache.hadoop.mapred.JobSubmissionProtocol#getTaskCompletionEvents(java.lang.String, int, int)
*/
public TaskCompletionEvent[] getTaskCompletionEvents(
JobID jobid, int fromEventId, int maxEvents) throws IOException{
JobInProgress job = this.jobs.get(jobid);
if (null != job) {
return isJobInited(job) ?
job.getTaskCompletionEvents(fromEventId, maxEvents) :
TaskCompletionEvent.EMPTY_ARRAY;
}
return completedJobStatusStore.readJobTaskCompletionEvents(jobid,
fromEventId,
maxEvents);
}
private static final String[] EMPTY_TASK_DIAGNOSTICS = new String[0];
/**
* Get the diagnostics for a given task
* @param taskId the id of the task
* @return an array of the diagnostic messages
*/
public synchronized String[] getTaskDiagnostics(TaskAttemptID taskId)
throws IOException {
List<String> taskDiagnosticInfo = null;
JobID jobId = taskId.getJobID();
TaskID tipId = taskId.getTaskID();
JobInProgress job = jobs.get(jobId);
if (job != null) {
// Check authorization
aclsManager.checkAccess(job, UserGroupInformation.getCurrentUser(),
Operation.VIEW_JOB_DETAILS);
}
if (job != null && isJobInited(job)) {
TaskInProgress tip = job.getTaskInProgress(tipId);
if (tip != null) {
taskDiagnosticInfo = tip.getDiagnosticInfo(taskId);
}
}
return ((taskDiagnosticInfo == null) ? EMPTY_TASK_DIAGNOSTICS :
taskDiagnosticInfo.toArray(new String[taskDiagnosticInfo.size()]));
}
/** Get all the TaskStatuses from the tipid. */
TaskStatus[] getTaskStatuses(TaskID tipid) {
TaskInProgress tip = getTip(tipid);
return (tip == null ? new TaskStatus[0]
: tip.getTaskStatuses());
}
/** Returns the TaskStatus for a particular taskid. */
TaskStatus getTaskStatus(TaskAttemptID taskid) {
TaskInProgress tip = getTip(taskid.getTaskID());
return (tip == null ? null
: tip.getTaskStatus(taskid));
}
/**
* Returns the counters for the specified task in progress.
*/
Counters getTipCounters(TaskID tipid) {
TaskInProgress tip = getTip(tipid);
return (tip == null ? null : tip.getCounters());
}
/**
* Returns the configured task scheduler for this job tracker.
* @return the configured task scheduler
*/
TaskScheduler getTaskScheduler() {
return taskScheduler;
}
/**
* Returns specified TaskInProgress, or null.
*/
public TaskInProgress getTip(TaskID tipid) {
JobInProgress job = jobs.get(tipid.getJobID());
return (job == null ? null : job.getTaskInProgress(tipid));
}
/**
* @see JobSubmissionProtocol#killTask(TaskAttemptID, boolean)
*/
public synchronized boolean killTask(TaskAttemptID taskid, boolean shouldFail)
throws IOException {
TaskInProgress tip = taskidToTIPMap.get(taskid);
if(tip != null) {
// check both queue-level and job-level access
aclsManager.checkAccess(tip.getJob(),
UserGroupInformation.getCurrentUser(),
shouldFail ? Operation.FAIL_TASK : Operation.KILL_TASK);
return tip.killTask(taskid, shouldFail);
}
else {
LOG.info("Kill task attempt failed since task " + taskid + " was not found");
return false;
}
}
/**
* Get tracker name for a given task id.
* @param taskId the name of the task
* @return The name of the task tracker
*/
public synchronized String getAssignedTracker(TaskAttemptID taskId) {
return taskidToTrackerMap.get(taskId);
}
public JobStatus[] jobsToComplete() {
return getJobStatus(jobs.values(), true);
}
/**
* @see JobSubmissionProtocol#getAllJobs()
*/
public JobStatus[] getAllJobs() {
List<JobStatus> list = new ArrayList<JobStatus>();
list.addAll(Arrays.asList(getJobStatus(jobs.values(),false)));
list.addAll(retireJobs.getAllJobStatus());
return list.toArray(new JobStatus[list.size()]);
}
/**
* @see org.apache.hadoop.mapred.JobSubmissionProtocol#getSystemDir()
*/
public String getSystemDir() {
Path sysDir = new Path(conf.get("mapred.system.dir", "/tmp/hadoop/mapred/system"));
return fs.makeQualified(sysDir).toString();
}
/**
* @see org.apache.hadoop.mapred.JobSubmissionProtocol#getQueueAdmins(String)
*/
public AccessControlList getQueueAdmins(String queueName) throws IOException {
AccessControlList acl =
queueManager.getQueueACL(queueName, QueueACL.ADMINISTER_JOBS);
if (acl == null) {
acl = new AccessControlList(" ");
}
return acl;
}
///////////////////////////////////////////////////////////////
// JobTracker methods
///////////////////////////////////////////////////////////////
public JobInProgress getJob(JobID jobid) {
return jobs.get(jobid);
}
// Get the job directory in system directory
Path getSystemDirectoryForJob(JobID id) {
return new Path(getSystemDir(), id.toString());
}
//Get the job token file in system directory
Path getSystemFileForJob(JobID id) {
return new Path(getSystemDirectoryForJob(id)+"/" + JOB_INFO_FILE);
}
/**
* Change the run-time priority of the given job.
*
* @param jobId job id
* @param priority new {@link JobPriority} for the job
* @throws IOException
* @throws AccessControlException
*/
synchronized void setJobPriority(JobID jobId, JobPriority priority)
throws AccessControlException, IOException {
JobInProgress job = jobs.get(jobId);
if (job != null) {
// check both queue-level and job-level access
aclsManager.checkAccess(job, UserGroupInformation.getCurrentUser(),
Operation.SET_JOB_PRIORITY);
synchronized (taskScheduler) {
JobStatus oldStatus = (JobStatus)job.getStatus().clone();
job.setPriority(priority);
JobStatus newStatus = (JobStatus)job.getStatus().clone();
JobStatusChangeEvent event =
new JobStatusChangeEvent(job, EventType.PRIORITY_CHANGED, oldStatus,
newStatus);
updateJobInProgressListeners(event);
}
} else {
LOG.warn("Trying to change the priority of an unknown job: " + jobId);
}
}
////////////////////////////////////////////////////
// Methods to track all the TaskTrackers
////////////////////////////////////////////////////
/**
* Accept and process a new TaskTracker profile. We might
* have known about the TaskTracker previously, or it might
* be brand-new. All task-tracker structures have already
* been updated. Just process the contained tasks and any
* jobs that might be affected.
*/
void updateTaskStatuses(TaskTrackerStatus status) {
String trackerName = status.getTrackerName();
for (TaskStatus report : status.getTaskReports()) {
report.setTaskTracker(trackerName);
TaskAttemptID taskId = report.getTaskID();
// expire it
expireLaunchingTasks.removeTask(taskId);
JobInProgress job = getJob(taskId.getJobID());
if (job == null) {
// if job is not there in the cleanup list ... add it
synchronized (trackerToJobsToCleanup) {
Set<JobID> jobs = trackerToJobsToCleanup.get(trackerName);
if (jobs == null) {
jobs = new HashSet<JobID>();
trackerToJobsToCleanup.put(trackerName, jobs);
}
jobs.add(taskId.getJobID());
}
continue;
}
if (!job.inited()) {
// if job is not yet initialized ... kill the attempt
synchronized (trackerToTasksToCleanup) {
Set<TaskAttemptID> tasks = trackerToTasksToCleanup.get(trackerName);
if (tasks == null) {
tasks = new HashSet<TaskAttemptID>();
trackerToTasksToCleanup.put(trackerName, tasks);
}
tasks.add(taskId);
}
continue;
}
TaskInProgress tip = taskidToTIPMap.get(taskId);
// Check if the tip is known to the jobtracker. In case of a restarted
// jt, some tasks might join in later
if (tip != null || hasRestarted()) {
if (tip == null) {
tip = job.getTaskInProgress(taskId.getTaskID());
job.addRunningTaskToTIP(tip, taskId, status, false);
}
// Update the job and inform the listeners if necessary
JobStatus prevStatus = (JobStatus)job.getStatus().clone();
// Clone TaskStatus object here, because JobInProgress
// or TaskInProgress can modify this object and
// the changes should not get reflected in TaskTrackerStatus.
// An old TaskTrackerStatus is used later in countMapTasks, etc.
job.updateTaskStatus(tip, (TaskStatus)report.clone());
JobStatus newStatus = (JobStatus)job.getStatus().clone();
// Update the listeners if an incomplete job completes
if (prevStatus.getRunState() != newStatus.getRunState()) {
JobStatusChangeEvent event =
new JobStatusChangeEvent(job, EventType.RUN_STATE_CHANGED,
prevStatus, newStatus);
updateJobInProgressListeners(event);
}
} else {
LOG.info("Serious problem. While updating status, cannot find taskid "
+ report.getTaskID());
}
// Process 'failed fetch' notifications
List<TaskAttemptID> failedFetchMaps = report.getFetchFailedMaps();
if (failedFetchMaps != null) {
for (TaskAttemptID mapTaskId : failedFetchMaps) {
TaskInProgress failedFetchMap = taskidToTIPMap.get(mapTaskId);
if (failedFetchMap != null) {
// Gather information about the map which has to be failed, if need be
String failedFetchTrackerName = getAssignedTracker(mapTaskId);
if (failedFetchTrackerName == null) {
failedFetchTrackerName = "Lost task tracker";
}
failedFetchMap.getJob().fetchFailureNotification(failedFetchMap,
mapTaskId,
failedFetchTrackerName);
}
}
}
}
}
/**
* We lost the task tracker! All task-tracker structures have
* already been updated. Just process the contained tasks and any
* jobs that might be affected.
*/
void lostTaskTracker(TaskTracker taskTracker) {
String trackerName = taskTracker.getTrackerName();
LOG.info("Lost tracker '" + trackerName + "'");
// remove the tracker from the local structures
synchronized (trackerToJobsToCleanup) {
trackerToJobsToCleanup.remove(trackerName);
}
synchronized (trackerToTasksToCleanup) {
trackerToTasksToCleanup.remove(trackerName);
}
// Inform the recovery manager
recoveryManager.unMarkTracker(trackerName);
Set<TaskAttemptID> lostTasks = trackerToTaskMap.get(trackerName);
trackerToTaskMap.remove(trackerName);
if (lostTasks != null) {
// List of jobs which had any of their tasks fail on this tracker
Set<JobInProgress> jobsWithFailures = new HashSet<JobInProgress>();
for (TaskAttemptID taskId : lostTasks) {
TaskInProgress tip = taskidToTIPMap.get(taskId);
JobInProgress job = tip.getJob();
// Completed reduce tasks never need to be failed, because
// their outputs go to dfs
// And completed maps with zero reducers of the job
// never need to be failed.
if (!tip.isComplete() ||
(tip.isMapTask() && !tip.isJobSetupTask() &&
job.desiredReduces() != 0)) {
// if the job is done, we don't want to change anything
if (job.getStatus().getRunState() == JobStatus.RUNNING ||
job.getStatus().getRunState() == JobStatus.PREP) {
// the state will be KILLED_UNCLEAN, if the task(map or reduce)
// was RUNNING on the tracker
TaskStatus.State killState = (tip.isRunningTask(taskId) &&
!tip.isJobSetupTask() && !tip.isJobCleanupTask()) ?
TaskStatus.State.KILLED_UNCLEAN : TaskStatus.State.KILLED;
job.failedTask(tip, taskId, ("Lost task tracker: " + trackerName),
(tip.isMapTask() ?
TaskStatus.Phase.MAP :
TaskStatus.Phase.REDUCE),
killState,
trackerName);
jobsWithFailures.add(job);
}
} else {
// Completed 'reduce' task and completed 'maps' with zero
// reducers of the job, not failed;
// only removed from data-structures.
markCompletedTaskAttempt(trackerName, taskId);
}
}
// Penalize this tracker for each of the jobs which
// had any tasks running on it when it was 'lost'
// Also, remove any reserved slots on this tasktracker
for (JobInProgress job : jobsWithFailures) {
job.addTrackerTaskFailure(trackerName, taskTracker);
}
// Cleanup
taskTracker.cancelAllReservations();
// Purge 'marked' tasks, needs to be done
// here to prevent hanging references!
removeMarkedTasks(trackerName);
}
}
/**
* Rereads the config to get hosts and exclude list file names.
* Rereads the files to update the hosts and exclude lists.
*/
public synchronized void refreshNodes() throws IOException {
String user = UserGroupInformation.getCurrentUser().getShortUserName();
// check access
if (!aclsManager.isMRAdmin(UserGroupInformation.getCurrentUser())) {
AuditLogger.logFailure(user, Constants.REFRESH_NODES,
aclsManager.getAdminsAcl().toString(), Constants.JOBTRACKER,
Constants.UNAUTHORIZED_USER);
throw new AccessControlException(user +
" is not authorized to refresh nodes.");
}
AuditLogger.logSuccess(user, Constants.REFRESH_NODES, Constants.JOBTRACKER);
// call the actual api
refreshHosts();
}
UserGroupInformation getMROwner() {
return aclsManager.getMROwner();
}
private synchronized void refreshHosts() throws IOException {
// Reread the config to get mapred.hosts and mapred.hosts.exclude filenames.
// Update the file names and refresh internal includes and excludes list
LOG.info("Refreshing hosts information");
Configuration conf = new Configuration();
hostsReader.updateFileNames(conf.get("mapred.hosts",""),
conf.get("mapred.hosts.exclude", ""));
hostsReader.refresh();
Set<String> excludeSet = new HashSet<String>();
for(Map.Entry<String, TaskTracker> eSet : taskTrackers.entrySet()) {
String trackerName = eSet.getKey();
TaskTrackerStatus status = eSet.getValue().getStatus();
// Check if not include i.e not in host list or in hosts list but excluded
if (!inHostsList(status) || inExcludedHostsList(status)) {
excludeSet.add(status.getHost()); // add to rejected trackers
}
}
decommissionNodes(excludeSet);
}
// Assumes JobTracker, taskTrackers and trackerExpiryQueue is locked on entry
// Remove a tracker from the system
private void removeTracker(TaskTracker tracker) {
String trackerName = tracker.getTrackerName();
// Remove completely after marking the tasks as 'KILLED'
lostTaskTracker(tracker);
// tracker is lost, and if it is blacklisted, remove
// it from the count of blacklisted trackers in the cluster
if (isBlacklisted(trackerName)) {
faultyTrackers.decrBlackListedTrackers(1);
}
updateTaskTrackerStatus(trackerName, null);
statistics.taskTrackerRemoved(trackerName);
getInstrumentation().decTrackers(1);
}
// main decommission
synchronized void decommissionNodes(Set<String> hosts)
throws IOException {
LOG.info("Decommissioning " + hosts.size() + " nodes");
// create a list of tracker hostnames
synchronized (taskTrackers) {
synchronized (trackerExpiryQueue) {
int trackersDecommissioned = 0;
for (String host : hosts) {
LOG.info("Decommissioning host " + host);
Set<TaskTracker> trackers = hostnameToTaskTracker.remove(host);
if (trackers != null) {
for (TaskTracker tracker : trackers) {
LOG.info("Decommission: Losing tracker " + tracker.getTrackerName() +
" on host " + host);
removeTracker(tracker);
}
trackersDecommissioned += trackers.size();
}
LOG.info("Host " + host + " is ready for decommissioning");
}
getInstrumentation().setDecommissionedTrackers(trackersDecommissioned);
}
}
}
/**
* Returns a set of excluded nodes.
*/
Collection<String> getExcludedNodes() {
return hostsReader.getExcludedHosts();
}
/**
* Get the localized job file path on the job trackers local file system
* @param jobId id of the job
* @return the path of the job conf file on the local file system
*/
public static String getLocalJobFilePath(JobID jobId){
return JobHistory.JobInfo.getLocalJobFilePath(jobId);
}
////////////////////////////////////////////////////////////
// main()
////////////////////////////////////////////////////////////
/**
* Start the JobTracker process. This is used only for debugging. As a rule,
* JobTracker should be run as part of the DFS Namenode process.
*/
public static void main(String argv[]
) throws IOException, InterruptedException {
StringUtils.startupShutdownMessage(JobTracker.class, argv, LOG);
try {
if(argv.length == 0) {
JobTracker tracker = startTracker(new JobConf());
tracker.offerService();
}
else {
if ("-dumpConfiguration".equals(argv[0]) && argv.length == 1) {
dumpConfiguration(new PrintWriter(System.out));
}
else {
System.out.println("usage: JobTracker [-dumpConfiguration]");
System.exit(-1);
}
}
} catch (Throwable e) {
LOG.fatal(StringUtils.stringifyException(e));
System.exit(-1);
}
}
/**
* Dumps the configuration properties in Json format
* @param writer {@link}Writer object to which the output is written
* @throws IOException
*/
private static void dumpConfiguration(Writer writer) throws IOException {
Configuration.dumpConfiguration(new JobConf(), writer);
writer.write("\n");
// get the QueueManager configuration properties
QueueManager.dumpConfiguration(writer);
writer.write("\n");
}
@Override
public JobQueueInfo[] getQueues() throws IOException {
return queueManager.getJobQueueInfos();
}
@Override
public JobQueueInfo getQueueInfo(String queue) throws IOException {
return queueManager.getJobQueueInfo(queue);
}
@Override
public JobStatus[] getJobsFromQueue(String queue) throws IOException {
Collection<JobInProgress> jips = taskScheduler.getJobs(queue);
return getJobStatus(jips,false);
}
@Override
public QueueAclsInfo[] getQueueAclsForCurrentUser() throws IOException{
return queueManager.getQueueAcls(
UserGroupInformation.getCurrentUser());
}
private synchronized JobStatus[] getJobStatus(Collection<JobInProgress> jips,
boolean toComplete) {
if(jips == null || jips.isEmpty()) {
return new JobStatus[]{};
}
ArrayList<JobStatus> jobStatusList = new ArrayList<JobStatus>();
for(JobInProgress jip : jips) {
JobStatus status = jip.getStatus();
status.setStartTime(jip.getStartTime());
status.setUsername(jip.getProfile().getUser());
if(toComplete) {
if(status.getRunState() == JobStatus.RUNNING ||
status.getRunState() == JobStatus.PREP) {
jobStatusList.add(status);
}
}else {
jobStatusList.add(status);
}
}
return jobStatusList.toArray(
new JobStatus[jobStatusList.size()]);
}
/**
* Returns the confgiured maximum number of tasks for a single job
*/
int getMaxTasksPerJob() {
return conf.getInt("mapred.jobtracker.maxtasks.per.job", -1);
}
@Override
public void refreshServiceAcl() throws IOException {
if (!conf.getBoolean(
CommonConfigurationKeys.HADOOP_SECURITY_AUTHORIZATION, false)) {
throw new AuthorizationException("Service Level Authorization not enabled!");
}
this.interTrackerServer.refreshServiceAcl(conf, new MapReducePolicyProvider());
}
private void initializeTaskMemoryRelatedConfig() {
memSizeForMapSlotOnJT =
JobConf.normalizeMemoryConfigValue(conf.getLong(
JobTracker.MAPRED_CLUSTER_MAP_MEMORY_MB_PROPERTY,
JobConf.DISABLED_MEMORY_LIMIT));
memSizeForReduceSlotOnJT =
JobConf.normalizeMemoryConfigValue(conf.getLong(
JobTracker.MAPRED_CLUSTER_REDUCE_MEMORY_MB_PROPERTY,
JobConf.DISABLED_MEMORY_LIMIT));
if (conf.get(JobConf.UPPER_LIMIT_ON_TASK_VMEM_PROPERTY) != null) {
LOG.warn(
JobConf.deprecatedString(
JobConf.UPPER_LIMIT_ON_TASK_VMEM_PROPERTY)+
" instead use "+JobTracker.MAPRED_CLUSTER_MAX_MAP_MEMORY_MB_PROPERTY+
" and " + JobTracker.MAPRED_CLUSTER_MAX_REDUCE_MEMORY_MB_PROPERTY
);
limitMaxMemForMapTasks = limitMaxMemForReduceTasks =
JobConf.normalizeMemoryConfigValue(
conf.getLong(
JobConf.UPPER_LIMIT_ON_TASK_VMEM_PROPERTY,
JobConf.DISABLED_MEMORY_LIMIT));
if (limitMaxMemForMapTasks != JobConf.DISABLED_MEMORY_LIMIT &&
limitMaxMemForMapTasks >= 0) {
limitMaxMemForMapTasks = limitMaxMemForReduceTasks =
limitMaxMemForMapTasks /
(1024 * 1024); //Converting old values in bytes to MB
}
} else {
limitMaxMemForMapTasks =
JobConf.normalizeMemoryConfigValue(
conf.getLong(
JobTracker.MAPRED_CLUSTER_MAX_MAP_MEMORY_MB_PROPERTY,
JobConf.DISABLED_MEMORY_LIMIT));
limitMaxMemForReduceTasks =
JobConf.normalizeMemoryConfigValue(
conf.getLong(
JobTracker.MAPRED_CLUSTER_MAX_REDUCE_MEMORY_MB_PROPERTY,
JobConf.DISABLED_MEMORY_LIMIT));
}
LOG.info(new StringBuilder().append("Scheduler configured with ").append(
"(memSizeForMapSlotOnJT, memSizeForReduceSlotOnJT,").append(
" limitMaxMemForMapTasks, limitMaxMemForReduceTasks) (").append(
memSizeForMapSlotOnJT).append(", ").append(memSizeForReduceSlotOnJT)
.append(", ").append(limitMaxMemForMapTasks).append(", ").append(
limitMaxMemForReduceTasks).append(")"));
}
@Override
public void refreshSuperUserGroupsConfiguration() {
LOG.info("Refreshing superuser proxy groups mapping ");
ProxyUsers.refreshSuperUserGroupsConfiguration();
}
@Override
public void refreshUserToGroupsMappings() throws IOException {
LOG.info("Refreshing all user-to-groups mappings. Requested by user: " +
UserGroupInformation.getCurrentUser().getShortUserName());
Groups.getUserToGroupsMappingService().refresh();
}
private boolean perTaskMemoryConfigurationSetOnJT() {
if (limitMaxMemForMapTasks == JobConf.DISABLED_MEMORY_LIMIT
|| limitMaxMemForReduceTasks == JobConf.DISABLED_MEMORY_LIMIT
|| memSizeForMapSlotOnJT == JobConf.DISABLED_MEMORY_LIMIT
|| memSizeForReduceSlotOnJT == JobConf.DISABLED_MEMORY_LIMIT) {
return false;
}
return true;
}
/**
* Check the job if it has invalid requirements and throw and IOException if does have.
*
* @param job
* @throws IOException
*/
private void checkMemoryRequirements(JobInProgress job)
throws IOException {
if (!perTaskMemoryConfigurationSetOnJT()) {
LOG.debug("Per-Task memory configuration is not set on JT. "
+ "Not checking the job for invalid memory requirements.");
return;
}
boolean invalidJob = false;
String msg = "";
long maxMemForMapTask = job.getMemoryForMapTask();
long maxMemForReduceTask = job.getMemoryForReduceTask();
if (maxMemForMapTask == JobConf.DISABLED_MEMORY_LIMIT
|| maxMemForReduceTask == JobConf.DISABLED_MEMORY_LIMIT) {
invalidJob = true;
msg = "Invalid job requirements.";
}
if (maxMemForMapTask > limitMaxMemForMapTasks
|| maxMemForReduceTask > limitMaxMemForReduceTasks) {
invalidJob = true;
msg = "Exceeds the cluster's max-memory-limit.";
}
if (invalidJob) {
StringBuilder jobStr =
new StringBuilder().append(job.getJobID().toString()).append("(")
.append(maxMemForMapTask).append(" memForMapTasks ").append(
maxMemForReduceTask).append(" memForReduceTasks): ");
LOG.warn(jobStr.toString() + msg);
throw new IOException(jobStr.toString() + msg);
}
}
@Override
public void refreshQueueAcls() throws IOException{
LOG.info("Refreshing queue acls. requested by : " +
UserGroupInformation.getCurrentUser().getShortUserName());
this.queueManager.refreshAcls(new Configuration(this.conf));
}
synchronized String getReasonsForBlacklisting(String host) {
FaultInfo fi = faultyTrackers.getFaultInfo(host, false);
if (fi == null) {
return "";
}
return fi.getTrackerFaultReport();
}
/** Test Methods */
synchronized Set<ReasonForBlackListing> getReasonForBlackList(String host) {
FaultInfo fi = faultyTrackers.getFaultInfo(host, false);
if (fi == null) {
return new HashSet<ReasonForBlackListing>();
}
return fi.getReasonforblacklisting();
}
/*
* This method is synchronized to make sure that the locking order
* "faultyTrackers.potentiallyFaultyTrackers lock followed by taskTrackers
* lock" is under JobTracker lock to avoid deadlocks.
*/
synchronized void incrementFaults(String hostName) {
faultyTrackers.incrementFaults(hostName);
}
/**
*
* @return true if delegation token operation is allowed
*/
private boolean isAllowedDelegationTokenOp() throws IOException {
AuthenticationMethod authMethod = getConnectionAuthenticationMethod();
if (UserGroupInformation.isSecurityEnabled()
&& (authMethod != AuthenticationMethod.KERBEROS)
&& (authMethod != AuthenticationMethod.KERBEROS_SSL)
&& (authMethod != AuthenticationMethod.CERTIFICATE)) {
return false;
}
return true;
}
/**
* Returns authentication method used to establish the connection
* @return AuthenticationMethod used to establish connection
* @throws IOException
*/
private AuthenticationMethod getConnectionAuthenticationMethod()
throws IOException {
UserGroupInformation ugi = UserGroupInformation.getCurrentUser();
AuthenticationMethod authMethod = ugi.getAuthenticationMethod();
if (authMethod == AuthenticationMethod.PROXY) {
authMethod = ugi.getRealUser().getAuthenticationMethod();
}
return authMethod;
}
JobACLsManager getJobACLsManager() {
return aclsManager.getJobACLsManager();
}
ACLsManager getACLsManager() {
return aclsManager;
}
}