/*
* 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.cassandra.db;
import java.io.DataInputStream;
import java.io.IOException;
import java.net.InetAddress;
import java.nio.ByteBuffer;
import java.nio.charset.CharacterCodingException;
import java.util.*;
import java.util.concurrent.ExecutionException;
import com.google.common.collect.HashMultimap;
import com.google.common.collect.SetMultimap;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.cassandra.config.DatabaseDescriptor;
import org.apache.cassandra.config.KSMetaData;
import org.apache.cassandra.config.Schema;
import org.apache.cassandra.cql3.QueryProcessor;
import org.apache.cassandra.cql3.UntypedResultSet;
import org.apache.cassandra.db.columniterator.IdentityQueryFilter;
import org.apache.cassandra.db.commitlog.ReplayPosition;
import org.apache.cassandra.db.filter.QueryFilter;
import org.apache.cassandra.db.filter.QueryPath;
import org.apache.cassandra.db.marshal.*;
import org.apache.cassandra.dht.Range;
import org.apache.cassandra.dht.Token;
import org.apache.cassandra.exceptions.ConfigurationException;
import org.apache.cassandra.io.util.DataOutputBuffer;
import org.apache.cassandra.locator.IEndpointSnitch;
import org.apache.cassandra.service.StorageService;
import org.apache.cassandra.thrift.Constants;
import org.apache.cassandra.utils.*;
import static org.apache.cassandra.cql3.QueryProcessor.processInternal;
public class SystemTable
{
private static final Logger logger = LoggerFactory.getLogger(SystemTable.class);
// see CFMetaData for schema definitions
public static final String PEERS_CF = "peers";
public static final String PEER_EVENTS_CF = "peer_events";
public static final String LOCAL_CF = "local";
public static final String INDEX_CF = "IndexInfo";
public static final String COUNTER_ID_CF = "NodeIdInfo";
public static final String HINTS_CF = "hints";
public static final String RANGE_XFERS_CF = "range_xfers";
public static final String BATCHLOG_CF = "batchlog";
// see layout description in the DefsTable class header
public static final String SCHEMA_KEYSPACES_CF = "schema_keyspaces";
public static final String SCHEMA_COLUMNFAMILIES_CF = "schema_columnfamilies";
public static final String SCHEMA_COLUMNS_CF = "schema_columns";
@Deprecated
public static final String OLD_STATUS_CF = "LocationInfo";
@Deprecated
public static final String OLD_HINTS_CF = "HintsColumnFamily";
private static final String LOCAL_KEY = "local";
private static final ByteBuffer ALL_LOCAL_NODE_ID_KEY = ByteBufferUtil.bytes("Local");
public enum BootstrapState
{
NEEDS_BOOTSTRAP,
COMPLETED,
IN_PROGRESS
}
private static DecoratedKey decorate(ByteBuffer key)
{
return StorageService.getPartitioner().decorateKey(key);
}
public static void finishStartup()
{
DefsTable.fixSchemaNanoTimestamps();
setupVersion();
try
{
upgradeSystemData();
}
catch (ExecutionException e)
{
throw new RuntimeException(e);
}
catch (InterruptedException e)
{
throw new RuntimeException(e);
}
// add entries to system schema columnfamilies for the hardcoded system definitions
for (String ksname : Schema.systemKeyspaceNames)
{
KSMetaData ksmd = Schema.instance.getKSMetaData(ksname);
// delete old, possibly obsolete entries in schema columnfamilies
for (String cfname : Arrays.asList(SystemTable.SCHEMA_KEYSPACES_CF, SystemTable.SCHEMA_COLUMNFAMILIES_CF, SystemTable.SCHEMA_COLUMNS_CF))
{
String req = String.format("DELETE FROM system.%s WHERE keyspace_name = '%s'", cfname, ksmd.name);
processInternal(req);
}
// (+1 to timestamp to make sure we don't get shadowed by the tombstones we just added)
ksmd.toSchema(FBUtilities.timestampMicros() + 1).apply();
}
}
private static void setupVersion()
{
String req = "INSERT INTO system.%s (key, release_version, cql_version, thrift_version, data_center, rack, partitioner) VALUES ('%s', '%s', '%s', '%s', '%s', '%s', '%s')";
IEndpointSnitch snitch = DatabaseDescriptor.getEndpointSnitch();
processInternal(String.format(req, LOCAL_CF,
LOCAL_KEY,
FBUtilities.getReleaseVersionString(),
QueryProcessor.CQL_VERSION.toString(),
Constants.VERSION,
snitch.getDatacenter(FBUtilities.getBroadcastAddress()),
snitch.getRack(FBUtilities.getBroadcastAddress()),
DatabaseDescriptor.getPartitioner().getClass().getName()));
}
/** if system data becomes incompatible across versions of cassandra, that logic (and associated purging) is managed here */
private static void upgradeSystemData() throws ExecutionException, InterruptedException
{
Table table = Table.open(Table.SYSTEM_KS);
ColumnFamilyStore oldStatusCfs = table.getColumnFamilyStore(OLD_STATUS_CF);
if (oldStatusCfs.getSSTables().size() > 0)
{
SortedSet<ByteBuffer> cols = new TreeSet<ByteBuffer>(BytesType.instance);
cols.add(ByteBufferUtil.bytes("ClusterName"));
cols.add(ByteBufferUtil.bytes("Token"));
QueryFilter filter = QueryFilter.getNamesFilter(decorate(ByteBufferUtil.bytes("L")), new QueryPath(OLD_STATUS_CF), cols);
ColumnFamily oldCf = oldStatusCfs.getColumnFamily(filter);
Iterator<IColumn> oldColumns = oldCf.columns.iterator();
String clusterName = null;
try
{
clusterName = ByteBufferUtil.string(oldColumns.next().value());
}
catch (CharacterCodingException e)
{
throw new RuntimeException(e);
}
// serialize the old token as a collection of (one )tokens.
Token token = StorageService.getPartitioner().getTokenFactory().fromByteArray(oldColumns.next().value());
String tokenBytes = tokensAsSet(Collections.singleton(token));
// (assume that any node getting upgraded was bootstrapped, since that was stored in a separate row for no particular reason)
String req = "INSERT INTO system.%s (key, cluster_name, tokens, bootstrapped) VALUES ('%s', '%s', %s, '%s')";
processInternal(String.format(req, LOCAL_CF, LOCAL_KEY, clusterName, tokenBytes, BootstrapState.COMPLETED.name()));
oldStatusCfs.truncate();
}
ColumnFamilyStore oldHintsCfs = table.getColumnFamilyStore(OLD_HINTS_CF);
if (oldHintsCfs.getSSTables().size() > 0)
{
logger.info("Possible old-format hints found. Truncating");
oldHintsCfs.truncate();
}
}
public static void saveTruncationPosition(ColumnFamilyStore cfs, ReplayPosition position)
{
String req = "UPDATE system.%s SET truncated_at = truncated_at + %s WHERE key = '%s'";
processInternal(String.format(req, LOCAL_CF, positionAsMapEntry(cfs, position), LOCAL_KEY));
forceBlockingFlush(LOCAL_CF);
}
private static String positionAsMapEntry(ColumnFamilyStore cfs, ReplayPosition position)
{
DataOutputBuffer out = new DataOutputBuffer();
try
{
ReplayPosition.serializer.serialize(position, out);
}
catch (IOException e)
{
throw new RuntimeException(e);
}
return String.format("{%s: 0x%s}",
cfs.metadata.cfId,
ByteBufferUtil.bytesToHex(ByteBuffer.wrap(out.getData(), 0, out.getLength())));
}
public static Map<UUID, ReplayPosition> getTruncationPositions()
{
String req = "SELECT truncated_at FROM system.%s WHERE key = '%s'";
UntypedResultSet rows = processInternal(String.format(req, LOCAL_CF, LOCAL_KEY));
if (rows.isEmpty())
return Collections.emptyMap();
UntypedResultSet.Row row = rows.one();
Map<UUID, ByteBuffer> rawMap = row.getMap("truncated_at", UUIDType.instance, BytesType.instance);
if (rawMap == null)
return Collections.emptyMap();
Map<UUID, ReplayPosition> positions = new HashMap<UUID, ReplayPosition>();
for (Map.Entry<UUID, ByteBuffer> entry : rawMap.entrySet())
{
positions.put(entry.getKey(), positionFromBlob(entry.getValue()));
}
return positions;
}
private static ReplayPosition positionFromBlob(ByteBuffer bytes)
{
try
{
return ReplayPosition.serializer.deserialize(new DataInputStream(ByteBufferUtil.inputStream(bytes)));
}
catch (IOException e)
{
throw new RuntimeException(e);
}
}
/**
* Record tokens being used by another node
*/
public static synchronized void updateTokens(InetAddress ep, Collection<Token> tokens)
{
if (ep.equals(FBUtilities.getBroadcastAddress()))
{
removeEndpoint(ep);
return;
}
String req = "INSERT INTO system.%s (peer, tokens) VALUES ('%s', %s)";
processInternal(String.format(req, PEERS_CF, ep.getHostAddress(), tokensAsSet(tokens)));
forceBlockingFlush(PEERS_CF);
}
public static synchronized void updatePeerInfo(InetAddress ep, String columnName, String value)
{
if (ep.equals(FBUtilities.getBroadcastAddress()))
return;
String req = "INSERT INTO system.%s (peer, %s) VALUES ('%s', %s)";
processInternal(String.format(req, PEERS_CF, columnName, ep.getHostAddress(), value));
}
public static synchronized void updateHintsDropped(InetAddress ep, UUID timePeriod, int value)
{
// with 30 day TTL
String req = "UPDATE system.%s USING TTL 2592000 SET hints_dropped[ %s ] = %s WHERE peer = '%s'";
processInternal(String.format(req, PEER_EVENTS_CF, timePeriod.toString(), value, ep.getHostAddress()));
}
public static synchronized void updateSchemaVersion(UUID version)
{
String req = "INSERT INTO system.%s (key, schema_version) VALUES ('%s', %s)";
processInternal(String.format(req, LOCAL_CF, LOCAL_KEY, version.toString()));
}
private static String tokensAsSet(Collection<Token> tokens)
{
Token.TokenFactory factory = StorageService.getPartitioner().getTokenFactory();
StringBuilder sb = new StringBuilder();
sb.append("{");
Iterator<Token> iter = tokens.iterator();
while (iter.hasNext())
{
sb.append("'").append(factory.toString(iter.next())).append("'");
if (iter.hasNext())
sb.append(",");
}
sb.append("}");
return sb.toString();
}
private static Collection<Token> deserializeTokens(Collection<String> tokensStrings)
{
Token.TokenFactory factory = StorageService.getPartitioner().getTokenFactory();
List<Token> tokens = new ArrayList<Token>(tokensStrings.size());
for (String tk : tokensStrings)
tokens.add(factory.fromString(tk));
return tokens;
}
/**
* Remove stored tokens being used by another node
*/
public static synchronized void removeEndpoint(InetAddress ep)
{
String req = "DELETE FROM system.%s WHERE peer = '%s'";
processInternal(String.format(req, PEERS_CF, ep.getHostAddress()));
forceBlockingFlush(PEERS_CF);
}
/**
* This method is used to update the System Table with the new tokens for this node
*/
public static synchronized void updateTokens(Collection<Token> tokens)
{
assert !tokens.isEmpty() : "removeEndpoint should be used instead";
String req = "INSERT INTO system.%s (key, tokens) VALUES ('%s', %s)";
processInternal(String.format(req, LOCAL_CF, LOCAL_KEY, tokensAsSet(tokens)));
forceBlockingFlush(LOCAL_CF);
}
/**
* Convenience method to update the list of tokens in the local system table.
*
* @param addTokens tokens to add
* @param rmTokens tokens to remove
* @return the collection of persisted tokens
*/
public static synchronized Collection<Token> updateLocalTokens(Collection<Token> addTokens, Collection<Token> rmTokens)
{
Collection<Token> tokens = getSavedTokens();
tokens.removeAll(rmTokens);
tokens.addAll(addTokens);
updateTokens(tokens);
return tokens;
}
private static void forceBlockingFlush(String cfname)
{
try
{
Table.open(Table.SYSTEM_KS).getColumnFamilyStore(cfname).forceBlockingFlush();
}
catch (ExecutionException e)
{
throw new RuntimeException(e);
}
catch (InterruptedException e)
{
throw new AssertionError(e);
}
}
/**
* Return a map of stored tokens to IP addresses
*
*/
public static SetMultimap<InetAddress, Token> loadTokens()
{
SetMultimap<InetAddress, Token> tokenMap = HashMultimap.create();
for (UntypedResultSet.Row row : processInternal("SELECT peer, tokens FROM system." + PEERS_CF))
{
InetAddress peer = row.getInetAddress("peer");
if (row.has("tokens"))
tokenMap.putAll(peer, deserializeTokens(row.getSet("tokens", UTF8Type.instance)));
}
return tokenMap;
}
/**
* Return a map of store host_ids to IP addresses
*
*/
public static Map<InetAddress, UUID> loadHostIds()
{
Map<InetAddress, UUID> hostIdMap = new HashMap<InetAddress, UUID>();
for (UntypedResultSet.Row row : processInternal("SELECT peer, host_id FROM system." + PEERS_CF))
{
InetAddress peer = row.getInetAddress("peer");
if (row.has("host_id"))
{
hostIdMap.put(peer, row.getUUID("host_id"));
}
}
return hostIdMap;
}
/**
* Return a map of IP addresses containing a map of dc and rack info
*/
public static Map<InetAddress, Map<String,String>> loadDcRackInfo()
{
Map<InetAddress, Map<String, String>> result = new HashMap<InetAddress, Map<String, String>>();
for (UntypedResultSet.Row row : processInternal("SELECT peer, data_center, rack from system." + PEERS_CF))
{
InetAddress peer = row.getInetAddress("peer");
if (row.has("data_center") && row.has("rack"))
{
Map<String, String> dcRack = new HashMap<String, String>();
dcRack.put("data_center", row.getString("data_center"));
dcRack.put("rack", row.getString("rack"));
result.put(peer, dcRack);
}
}
return result;
}
/**
* One of three things will happen if you try to read the system table:
* 1. files are present and you can read them: great
* 2. no files are there: great (new node is assumed)
* 3. files are present but you can't read them: bad
* @throws ConfigurationException
*/
public static void checkHealth() throws ConfigurationException
{
Table table;
try
{
table = Table.open(Table.SYSTEM_KS);
}
catch (AssertionError err)
{
// this happens when a user switches from OPP to RP.
ConfigurationException ex = new ConfigurationException("Could not read system table!");
ex.initCause(err);
throw ex;
}
ColumnFamilyStore cfs = table.getColumnFamilyStore(LOCAL_CF);
String req = "SELECT cluster_name FROM system.%s WHERE key='%s'";
UntypedResultSet result = processInternal(String.format(req, LOCAL_CF, LOCAL_KEY));
if (result.isEmpty() || !result.one().has("cluster_name"))
{
// this is a brand new node
if (!cfs.getSSTables().isEmpty())
throw new ConfigurationException("Found system table files, but they couldn't be loaded!");
// no system files. this is a new node.
req = "INSERT INTO system.%s (key, cluster_name) VALUES ('%s', '%s')";
processInternal(String.format(req, LOCAL_CF, LOCAL_KEY, DatabaseDescriptor.getClusterName()));
return;
}
String savedClusterName = result.one().getString("cluster_name");
if (!DatabaseDescriptor.getClusterName().equals(savedClusterName))
throw new ConfigurationException("Saved cluster name " + savedClusterName + " != configured name " + DatabaseDescriptor.getClusterName());
}
public static Collection<Token> getSavedTokens()
{
String req = "SELECT tokens FROM system.%s WHERE key='%s'";
UntypedResultSet result = processInternal(String.format(req, LOCAL_CF, LOCAL_KEY));
return result.isEmpty() || !result.one().has("tokens")
? Collections.<Token>emptyList()
: deserializeTokens(result.one().<String>getSet("tokens", UTF8Type.instance));
}
public static int incrementAndGetGeneration()
{
String req = "SELECT gossip_generation FROM system.%s WHERE key='%s'";
UntypedResultSet result = processInternal(String.format(req, LOCAL_CF, LOCAL_KEY));
int generation;
if (result.isEmpty() || !result.one().has("gossip_generation"))
{
// seconds-since-epoch isn't a foolproof new generation
// (where foolproof is "guaranteed to be larger than the last one seen at this ip address"),
// but it's as close as sanely possible
generation = (int) (System.currentTimeMillis() / 1000);
}
else
{
// Other nodes will ignore gossip messages about a node that have a lower generation than previously seen.
final int storedGeneration = result.one().getInt("gossip_generation") + 1;
final int now = (int) (System.currentTimeMillis() / 1000);
if (storedGeneration >= now)
{
logger.warn("Using stored Gossip Generation {} as it is greater than current system time {}. See CASSANDRA-3654 if you experience problems",
storedGeneration, now);
generation = storedGeneration;
}
else
{
generation = now;
}
}
req = "INSERT INTO system.%s (key, gossip_generation) VALUES ('%s', %d)";
processInternal(String.format(req, LOCAL_CF, LOCAL_KEY, generation));
forceBlockingFlush(LOCAL_CF);
return generation;
}
public static BootstrapState getBootstrapState()
{
String req = "SELECT bootstrapped FROM system.%s WHERE key='%s'";
UntypedResultSet result = processInternal(String.format(req, LOCAL_CF, LOCAL_KEY));
if (result.isEmpty() || !result.one().has("bootstrapped"))
return BootstrapState.NEEDS_BOOTSTRAP;
return BootstrapState.valueOf(result.one().getString("bootstrapped"));
}
public static boolean bootstrapComplete()
{
return getBootstrapState() == BootstrapState.COMPLETED;
}
public static boolean bootstrapInProgress()
{
return getBootstrapState() == BootstrapState.IN_PROGRESS;
}
public static void setBootstrapState(BootstrapState state)
{
String req = "INSERT INTO system.%s (key, bootstrapped) VALUES ('%s', '%s')";
processInternal(String.format(req, LOCAL_CF, LOCAL_KEY, state.name()));
forceBlockingFlush(LOCAL_CF);
}
public static boolean isIndexBuilt(String table, String indexName)
{
ColumnFamilyStore cfs = Table.open(Table.SYSTEM_KS).getColumnFamilyStore(INDEX_CF);
QueryFilter filter = QueryFilter.getNamesFilter(decorate(ByteBufferUtil.bytes(table)),
new QueryPath(INDEX_CF),
ByteBufferUtil.bytes(indexName));
return ColumnFamilyStore.removeDeleted(cfs.getColumnFamily(filter), Integer.MAX_VALUE) != null;
}
public static void setIndexBuilt(String table, String indexName)
{
ColumnFamily cf = ColumnFamily.create(Table.SYSTEM_KS, INDEX_CF);
cf.addColumn(new Column(ByteBufferUtil.bytes(indexName), ByteBufferUtil.EMPTY_BYTE_BUFFER, FBUtilities.timestampMicros()));
RowMutation rm = new RowMutation(Table.SYSTEM_KS, ByteBufferUtil.bytes(table));
rm.add(cf);
rm.apply();
forceBlockingFlush(INDEX_CF);
}
public static void setIndexRemoved(String table, String indexName)
{
RowMutation rm = new RowMutation(Table.SYSTEM_KS, ByteBufferUtil.bytes(table));
rm.delete(new QueryPath(INDEX_CF, null, ByteBufferUtil.bytes(indexName)), FBUtilities.timestampMicros());
rm.apply();
forceBlockingFlush(INDEX_CF);
}
/**
* Read the host ID from the system table, creating (and storing) one if
* none exists.
*/
public static UUID getLocalHostId()
{
UUID hostId = null;
String req = "SELECT host_id FROM system.%s WHERE key='%s'";
UntypedResultSet result = processInternal(String.format(req, LOCAL_CF, LOCAL_KEY));
// Look up the Host UUID (return it if found)
if (!result.isEmpty() && result.one().has("host_id"))
{
return result.one().getUUID("host_id");
}
// ID not found, generate a new one, persist, and then return it.
hostId = UUID.randomUUID();
logger.warn("No host ID found, created {} (Note: This should happen exactly once per node).", hostId);
req = "INSERT INTO system.%s (key, host_id) VALUES ('%s', %s)";
processInternal(String.format(req, LOCAL_CF, LOCAL_KEY, hostId));
return hostId;
}
/**
* Read the current local node id from the system table or null if no
* such node id is recorded.
*/
public static CounterId getCurrentLocalCounterId()
{
Table table = Table.open(Table.SYSTEM_KS);
// Get the last CounterId (since CounterId are timeuuid is thus ordered from the older to the newer one)
QueryFilter filter = QueryFilter.getSliceFilter(decorate(ALL_LOCAL_NODE_ID_KEY),
new QueryPath(COUNTER_ID_CF),
ByteBufferUtil.EMPTY_BYTE_BUFFER,
ByteBufferUtil.EMPTY_BYTE_BUFFER,
true,
1);
ColumnFamily cf = table.getColumnFamilyStore(COUNTER_ID_CF).getColumnFamily(filter);
if (cf != null && cf.getColumnCount() != 0)
return CounterId.wrap(cf.iterator().next().name());
else
return null;
}
/**
* Write a new current local node id to the system table.
*
* @param oldCounterId the previous local node id (that {@code newCounterId}
* replace) or null if no such node id exists (new node or removed system
* table)
* @param newCounterId the new current local node id to record
* @param now microsecond time stamp.
*/
public static void writeCurrentLocalCounterId(CounterId oldCounterId, CounterId newCounterId, long now)
{
ByteBuffer ip = ByteBuffer.wrap(FBUtilities.getBroadcastAddress().getAddress());
ColumnFamily cf = ColumnFamily.create(Table.SYSTEM_KS, COUNTER_ID_CF);
cf.addColumn(new Column(newCounterId.bytes(), ip, now));
RowMutation rm = new RowMutation(Table.SYSTEM_KS, ALL_LOCAL_NODE_ID_KEY);
rm.add(cf);
rm.apply();
forceBlockingFlush(COUNTER_ID_CF);
}
public static List<CounterId.CounterIdRecord> getOldLocalCounterIds()
{
List<CounterId.CounterIdRecord> l = new ArrayList<CounterId.CounterIdRecord>();
Table table = Table.open(Table.SYSTEM_KS);
QueryFilter filter = QueryFilter.getIdentityFilter(decorate(ALL_LOCAL_NODE_ID_KEY), new QueryPath(COUNTER_ID_CF));
ColumnFamily cf = table.getColumnFamilyStore(COUNTER_ID_CF).getColumnFamily(filter);
CounterId previous = null;
for (IColumn c : cf)
{
if (previous != null)
l.add(new CounterId.CounterIdRecord(previous, c.timestamp()));
// this will ignore the last column on purpose since it is the
// current local node id
previous = CounterId.wrap(c.name());
}
return l;
}
/**
* @param cfName The name of the ColumnFamily responsible for part of the schema (keyspace, ColumnFamily, columns)
* @return CFS responsible to hold low-level serialized schema
*/
public static ColumnFamilyStore schemaCFS(String cfName)
{
return Table.open(Table.SYSTEM_KS).getColumnFamilyStore(cfName);
}
public static List<Row> serializedSchema()
{
List<Row> schema = new ArrayList<Row>(3);
schema.addAll(serializedSchema(SCHEMA_KEYSPACES_CF));
schema.addAll(serializedSchema(SCHEMA_COLUMNFAMILIES_CF));
schema.addAll(serializedSchema(SCHEMA_COLUMNS_CF));
return schema;
}
/**
* @param schemaCfName The name of the ColumnFamily responsible for part of the schema (keyspace, ColumnFamily, columns)
* @return low-level schema representation (each row represents individual Keyspace or ColumnFamily)
*/
public static List<Row> serializedSchema(String schemaCfName)
{
Token minToken = StorageService.getPartitioner().getMinimumToken();
return schemaCFS(schemaCfName).getRangeSlice(null,
new Range<RowPosition>(minToken.minKeyBound(),
minToken.maxKeyBound()),
Integer.MAX_VALUE,
new IdentityQueryFilter(),
null);
}
public static Collection<RowMutation> serializeSchema()
{
Map<DecoratedKey, RowMutation> mutationMap = new HashMap<DecoratedKey, RowMutation>();
serializeSchema(mutationMap, SCHEMA_KEYSPACES_CF);
serializeSchema(mutationMap, SCHEMA_COLUMNFAMILIES_CF);
serializeSchema(mutationMap, SCHEMA_COLUMNS_CF);
return mutationMap.values();
}
private static void serializeSchema(Map<DecoratedKey, RowMutation> mutationMap, String schemaCfName)
{
for (Row schemaRow : serializedSchema(schemaCfName))
{
if (Schema.ignoredSchemaRow(schemaRow))
continue;
RowMutation mutation = mutationMap.get(schemaRow.key);
if (mutation == null)
{
mutationMap.put(schemaRow.key, new RowMutation(Table.SYSTEM_KS, schemaRow));
continue;
}
mutation.add(schemaRow.cf);
}
}
public static Map<DecoratedKey, ColumnFamily> getSchema(String cfName)
{
Map<DecoratedKey, ColumnFamily> schema = new HashMap<DecoratedKey, ColumnFamily>();
for (Row schemaEntity : SystemTable.serializedSchema(cfName))
schema.put(schemaEntity.key, schemaEntity.cf);
return schema;
}
public static ByteBuffer getSchemaKSKey(String ksName)
{
return AsciiType.instance.fromString(ksName);
}
public static Row readSchemaRow(String ksName)
{
DecoratedKey key = StorageService.getPartitioner().decorateKey(getSchemaKSKey(ksName));
ColumnFamilyStore schemaCFS = SystemTable.schemaCFS(SCHEMA_KEYSPACES_CF);
ColumnFamily result = schemaCFS.getColumnFamily(QueryFilter.getIdentityFilter(key, new QueryPath(SCHEMA_KEYSPACES_CF)));
return new Row(key, result);
}
public static Row readSchemaRow(String ksName, String cfName)
{
DecoratedKey key = StorageService.getPartitioner().decorateKey(getSchemaKSKey(ksName));
ColumnFamilyStore schemaCFS = SystemTable.schemaCFS(SCHEMA_COLUMNFAMILIES_CF);
ColumnFamily result = schemaCFS.getColumnFamily(key,
new QueryPath(SCHEMA_COLUMNFAMILIES_CF),
DefsTable.searchComposite(cfName, true),
DefsTable.searchComposite(cfName, false),
false,
Integer.MAX_VALUE);
return new Row(key, result);
}
}