/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at legal-notices/CDDLv1_0.txt
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* or http://forgerock.org/license/CDDLv1.0.html.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at legal-notices/CDDLv1_0.txt.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information:
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* Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*
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*
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* Portions Copyright 2013-2014 ForgeRock AS
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*/
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package org.opends.server.replication.server.changelog.je;
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import java.io.File;
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import java.util.*;
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import java.util.concurrent.ConcurrentHashMap;
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import java.util.concurrent.ConcurrentMap;
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import java.util.concurrent.ConcurrentSkipListMap;
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import java.util.concurrent.CopyOnWriteArrayList;
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import java.util.concurrent.atomic.AtomicBoolean;
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import java.util.concurrent.atomic.AtomicReference;
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import org.forgerock.i18n.LocalizableMessageBuilder;
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import org.forgerock.i18n.slf4j.LocalizedLogger;
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import org.forgerock.opendj.config.server.ConfigException;
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import org.opends.server.admin.std.server.ReplicationServerCfg;
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import org.opends.server.api.DirectoryThread;
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import org.opends.server.replication.common.CSN;
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import org.opends.server.replication.common.MultiDomainServerState;
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import org.opends.server.replication.common.ServerState;
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import org.opends.server.replication.protocol.UpdateMsg;
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import org.opends.server.replication.server.ChangelogState;
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import org.opends.server.replication.server.ReplicationServer;
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import org.opends.server.replication.server.changelog.api.*;
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import org.opends.server.replication.server.changelog.api.DBCursor.PositionStrategy;
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import org.opends.server.types.DN;
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import org.opends.server.util.StaticUtils;
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import org.opends.server.util.TimeThread;
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import com.forgerock.opendj.util.Pair;
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import static org.opends.messages.ReplicationMessages.*;
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import static org.opends.server.util.StaticUtils.*;
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/**
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* JE implementation of the ChangelogDB interface.
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*/
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public class JEChangelogDB implements ChangelogDB, ReplicationDomainDB
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{
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/** The tracer object for the debug logger. */
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protected static final LocalizedLogger logger = LocalizedLogger.getLoggerForThisClass();
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/**
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* This map contains the List of updates received from each LDAP server.
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* <p>
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* When removing a domainMap, code:
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* <ol>
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* <li>first get the domainMap</li>
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* <li>synchronized on the domainMap</li>
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* <li>remove the domainMap</li>
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* <li>then check it's not null</li>
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* <li>then close all inside</li>
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* </ol>
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* When creating a replicaDB, synchronize on the domainMap to avoid
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* concurrent shutdown.
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*/
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private final ConcurrentMap<DN, ConcurrentMap<Integer, JEReplicaDB>> domainToReplicaDBs =
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new ConcurrentHashMap<DN, ConcurrentMap<Integer, JEReplicaDB>>();
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/**
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* \@GuardedBy("itself")
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*/
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private final Map<DN, List<DomainDBCursor>> registeredDomainCursors =
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new HashMap<DN, List<DomainDBCursor>>();
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private final CopyOnWriteArrayList<MultiDomainDBCursor> registeredMultiDomainCursors =
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new CopyOnWriteArrayList<MultiDomainDBCursor>();
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private final ConcurrentSkipListMap<Pair<DN, Integer>, List<ReplicaCursor>> replicaCursors =
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new ConcurrentSkipListMap<Pair<DN, Integer>, List<ReplicaCursor>>(Pair.COMPARATOR);
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private ReplicationDbEnv replicationEnv;
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private final ReplicationServerCfg config;
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private final File dbDirectory;
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/**
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* The handler of the changelog database, the database stores the relation
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* between a change number and the associated cookie.
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* <p>
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* @GuardedBy("cnIndexDBLock")
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*/
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private JEChangeNumberIndexDB cnIndexDB;
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private final AtomicReference<ChangeNumberIndexer> cnIndexer = new AtomicReference<ChangeNumberIndexer>();
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/** Used for protecting {@link ChangeNumberIndexDB} related state. */
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private final Object cnIndexDBLock = new Object();
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/**
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* The purge delay (in milliseconds). Records in the changelog DB that are
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* older than this delay might be removed.
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*/
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private long purgeDelayInMillis;
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private final AtomicReference<ChangelogDBPurger> cnPurger = new AtomicReference<ChangelogDBPurger>();
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private volatile long latestPurgeDate;
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/** The local replication server. */
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private final ReplicationServer replicationServer;
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private final AtomicBoolean shutdown = new AtomicBoolean();
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private static final DBCursor<UpdateMsg> EMPTY_CURSOR_REPLICA_DB =
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new DBCursor<UpdateMsg>()
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{
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@Override
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public boolean next()
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{
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return false;
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}
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@Override
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public UpdateMsg getRecord()
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{
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return null;
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}
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@Override
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public void close()
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{
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// empty
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}
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@Override
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public String toString()
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{
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return "EmptyDBCursor<UpdateMsg>";
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}
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};
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/**
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* Creates a new changelog DB.
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*
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* @param replicationServer
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* the local replication server.
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* @param config
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* the replication server configuration
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* @throws ConfigException
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* if a problem occurs opening the supplied directory
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*/
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public JEChangelogDB(final ReplicationServer replicationServer, final ReplicationServerCfg config)
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throws ConfigException
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{
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this.config = config;
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this.replicationServer = replicationServer;
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this.dbDirectory = makeDir(config.getReplicationDBDirectory());
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}
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private File makeDir(final String dbDirName) throws ConfigException
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{
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// Check that this path exists or create it.
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final File dbDirectory = getFileForPath(dbDirName);
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try
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{
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if (!dbDirectory.exists())
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{
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dbDirectory.mkdir();
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}
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return dbDirectory;
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}
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catch (Exception e)
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{
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logger.traceException(e);
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final LocalizableMessageBuilder mb = new LocalizableMessageBuilder(
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e.getLocalizedMessage()).append(" ").append(String.valueOf(dbDirectory));
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throw new ConfigException(ERR_FILE_CHECK_CREATE_FAILED.get(mb.toString()), e);
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}
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}
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private Map<Integer, JEReplicaDB> getDomainMap(final DN baseDN)
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{
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final Map<Integer, JEReplicaDB> domainMap = domainToReplicaDBs.get(baseDN);
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if (domainMap != null)
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{
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return domainMap;
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}
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return Collections.emptyMap();
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}
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private JEReplicaDB getReplicaDB(final DN baseDN, final int serverId)
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{
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return getDomainMap(baseDN).get(serverId);
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}
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/**
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* Returns a {@link JEReplicaDB}, possibly creating it.
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*
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* @param baseDN
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* the baseDN for which to create a ReplicaDB
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* @param serverId
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* the serverId for which to create a ReplicaDB
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* @param server
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* the ReplicationServer
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* @return a Pair with the JEReplicaDB and a boolean indicating whether it has been created
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* @throws ChangelogException
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* if a problem occurred with the database
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*/
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Pair<JEReplicaDB, Boolean> getOrCreateReplicaDB(final DN baseDN, final int serverId,
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final ReplicationServer server) throws ChangelogException
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{
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while (!shutdown.get())
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{
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final ConcurrentMap<Integer, JEReplicaDB> domainMap = getExistingOrNewDomainMap(baseDN);
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final Pair<JEReplicaDB, Boolean> result = getExistingOrNewReplicaDB(domainMap, serverId, baseDN, server);
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if (result != null)
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{
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final Boolean dbWasCreated = result.getSecond();
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if (dbWasCreated)
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{ // new replicaDB => update all cursors with it
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final List<DomainDBCursor> cursors = registeredDomainCursors.get(baseDN);
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if (cursors != null && !cursors.isEmpty())
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{
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for (DomainDBCursor cursor : cursors)
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{
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cursor.addReplicaDB(serverId, null);
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}
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}
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}
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return result;
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}
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}
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throw new ChangelogException(ERR_CANNOT_CREATE_REPLICA_DB_BECAUSE_CHANGELOG_DB_SHUTDOWN.get());
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}
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private ConcurrentMap<Integer, JEReplicaDB> getExistingOrNewDomainMap(final DN baseDN)
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{
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// happy path: the domainMap already exists
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final ConcurrentMap<Integer, JEReplicaDB> currentValue = domainToReplicaDBs.get(baseDN);
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if (currentValue != null)
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{
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return currentValue;
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}
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// unlucky, the domainMap does not exist: take the hit and create the
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// newValue, even though the same could be done concurrently by another thread
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final ConcurrentMap<Integer, JEReplicaDB> newValue = new ConcurrentHashMap<Integer, JEReplicaDB>();
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final ConcurrentMap<Integer, JEReplicaDB> previousValue = domainToReplicaDBs.putIfAbsent(baseDN, newValue);
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if (previousValue != null)
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{
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// there was already a value associated to the key, let's use it
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return previousValue;
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}
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// we just created a new domain => update all cursors
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for (MultiDomainDBCursor cursor : registeredMultiDomainCursors)
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{
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cursor.addDomain(baseDN, null);
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}
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return newValue;
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}
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private Pair<JEReplicaDB, Boolean> getExistingOrNewReplicaDB(final ConcurrentMap<Integer, JEReplicaDB> domainMap,
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final int serverId, final DN baseDN, final ReplicationServer server) throws ChangelogException
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{
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// happy path: the replicaDB already exists
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JEReplicaDB currentValue = domainMap.get(serverId);
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if (currentValue != null)
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{
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return Pair.of(currentValue, false);
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}
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// unlucky, the replicaDB does not exist: take the hit and synchronize
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// on the domainMap to create a new ReplicaDB
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synchronized (domainMap)
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{
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// double-check
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currentValue = domainMap.get(serverId);
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if (currentValue != null)
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{
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return Pair.of(currentValue, false);
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}
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if (domainToReplicaDBs.get(baseDN) != domainMap)
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{
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// The domainMap could have been concurrently removed because
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// 1) a shutdown was initiated or 2) an initialize was called.
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// Return will allow the code to:
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// 1) shutdown properly or 2) lazily recreate the replicaDB
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return null;
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}
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final JEReplicaDB newDB = new JEReplicaDB(serverId, baseDN, server, replicationEnv);
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domainMap.put(serverId, newDB);
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return Pair.of(newDB, true);
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}
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}
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/** {@inheritDoc} */
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@Override
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public void initializeDB()
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{
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try
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{
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final File dbDir = getFileForPath(config.getReplicationDBDirectory());
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replicationEnv = new ReplicationDbEnv(dbDir.getAbsolutePath(), replicationServer);
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final ChangelogState changelogState = replicationEnv.getChangelogState();
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initializeToChangelogState(changelogState);
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if (config.isComputeChangeNumber())
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{
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startIndexer(changelogState);
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}
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setPurgeDelay(replicationServer.getPurgeDelay());
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}
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catch (ChangelogException e)
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{
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logger.traceException(e);
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logger.error(ERR_COULD_NOT_READ_DB, this.dbDirectory.getAbsolutePath(), e.getLocalizedMessage());
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}
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}
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private void initializeToChangelogState(final ChangelogState changelogState)
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throws ChangelogException
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{
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for (Map.Entry<DN, Long> entry : changelogState.getDomainToGenerationId().entrySet())
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{
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replicationServer.getReplicationServerDomain(entry.getKey(), true).initGenerationID(entry.getValue());
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}
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for (Map.Entry<DN, Set<Integer>> entry : changelogState.getDomainToServerIds().entrySet())
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{
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for (int serverId : entry.getValue())
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{
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getOrCreateReplicaDB(entry.getKey(), serverId, replicationServer);
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}
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}
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}
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private void shutdownChangeNumberIndexDB() throws ChangelogException
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{
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synchronized (cnIndexDBLock)
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{
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if (cnIndexDB != null)
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{
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cnIndexDB.shutdown();
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}
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}
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}
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/** {@inheritDoc} */
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@Override
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public void shutdownDB() throws ChangelogException
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{
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if (!this.shutdown.compareAndSet(false, true))
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{ // shutdown has already been initiated
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return;
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}
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// Remember the first exception because :
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// - we want to try to remove everything we want to remove
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// - then throw the first encountered exception
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ChangelogException firstException = null;
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final ChangeNumberIndexer indexer = cnIndexer.getAndSet(null);
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if (indexer != null)
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{
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indexer.initiateShutdown();
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}
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final ChangelogDBPurger purger = cnPurger.getAndSet(null);
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if (purger != null)
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{
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purger.initiateShutdown();
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}
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try
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{
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shutdownChangeNumberIndexDB();
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}
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catch (ChangelogException e)
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{
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firstException = e;
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}
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for (Iterator<ConcurrentMap<Integer, JEReplicaDB>> it =
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this.domainToReplicaDBs.values().iterator(); it.hasNext();)
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{
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final ConcurrentMap<Integer, JEReplicaDB> domainMap = it.next();
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synchronized (domainMap)
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{
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it.remove();
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for (JEReplicaDB replicaDB : domainMap.values())
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{
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replicaDB.shutdown();
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}
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}
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}
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if (replicationEnv != null)
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{
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// wait for shutdown of the threads holding cursors
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try
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{
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if (indexer != null)
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{
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indexer.join();
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}
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if (purger != null)
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{
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purger.join();
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}
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}
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catch (InterruptedException e)
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{
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// do nothing: we are already shutting down
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}
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replicationEnv.shutdown();
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}
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if (firstException != null)
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{
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throw firstException;
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}
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}
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/**
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* Clears all records from the changelog (does not remove the changelog itself).
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*
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* @throws ChangelogException
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* If an error occurs when clearing the changelog.
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*/
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public void clearDB() throws ChangelogException
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{
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if (!dbDirectory.exists())
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{
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return;
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}
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// Remember the first exception because :
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// - we want to try to remove everything we want to remove
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// - then throw the first encountered exception
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ChangelogException firstException = null;
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for (DN baseDN : this.domainToReplicaDBs.keySet())
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{
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removeDomain(baseDN);
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}
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synchronized (cnIndexDBLock)
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{
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if (cnIndexDB != null)
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{
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try
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{
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cnIndexDB.clear();
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}
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catch (ChangelogException e)
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{
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firstException = e;
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}
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try
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{
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shutdownChangeNumberIndexDB();
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}
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catch (ChangelogException e)
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{
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if (firstException == null)
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{
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firstException = e;
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}
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else
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{
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logger.traceException(e);
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}
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}
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cnIndexDB = null;
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}
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}
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if (firstException != null)
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{
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throw firstException;
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}
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}
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/** {@inheritDoc} */
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@Override
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public void removeDB() throws ChangelogException
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{
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shutdownDB();
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StaticUtils.recursiveDelete(dbDirectory);
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}
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/** {@inheritDoc} */
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@Override
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public ServerState getDomainOldestCSNs(DN baseDN)
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{
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final ServerState result = new ServerState();
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for (JEReplicaDB replicaDB : getDomainMap(baseDN).values())
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{
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result.update(replicaDB.getOldestCSN());
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}
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return result;
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}
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/** {@inheritDoc} */
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@Override
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public ServerState getDomainNewestCSNs(DN baseDN)
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{
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final ServerState result = new ServerState();
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for (JEReplicaDB replicaDB : getDomainMap(baseDN).values())
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{
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result.update(replicaDB.getNewestCSN());
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}
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return result;
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}
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/** {@inheritDoc} */
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@Override
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public void removeDomain(DN baseDN) throws ChangelogException
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{
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// Remember the first exception because :
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// - we want to try to remove everything we want to remove
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// - then throw the first encountered exception
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ChangelogException firstException = null;
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// 1- clear the replica DBs
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Map<Integer, JEReplicaDB> domainMap = domainToReplicaDBs.get(baseDN);
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if (domainMap != null)
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{
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final ChangeNumberIndexer indexer = this.cnIndexer.get();
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if (indexer != null)
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{
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indexer.clear(baseDN);
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}
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synchronized (domainMap)
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{
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domainMap = domainToReplicaDBs.remove(baseDN);
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for (JEReplicaDB replicaDB : domainMap.values())
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{
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try
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{
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replicaDB.clear();
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}
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catch (ChangelogException e)
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{
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firstException = e;
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}
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replicaDB.shutdown();
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}
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}
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}
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// 2- clear the ChangeNumber index DB
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synchronized (cnIndexDBLock)
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{
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if (cnIndexDB != null)
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{
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try
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{
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cnIndexDB.removeDomain(baseDN);
|
}
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catch (ChangelogException e)
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{
|
if (firstException == null)
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{
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firstException = e;
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}
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else
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{
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logger.traceException(e);
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}
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}
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}
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}
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// 3- clear the changelogstate DB
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try
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{
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replicationEnv.clearGenerationId(baseDN);
|
}
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catch (ChangelogException e)
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{
|
if (firstException == null)
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{
|
firstException = e;
|
}
|
else
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{
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logger.traceException(e);
|
}
|
}
|
|
if (firstException != null)
|
{
|
throw firstException;
|
}
|
}
|
|
/** {@inheritDoc} */
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@Override
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public void setPurgeDelay(final long purgeDelayInMillis)
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{
|
this.purgeDelayInMillis = purgeDelayInMillis;
|
final ChangelogDBPurger purger;
|
if (purgeDelayInMillis > 0)
|
{
|
purger = new ChangelogDBPurger();
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if (cnPurger.compareAndSet(null, purger))
|
{
|
purger.start();
|
} // otherwise a purger was already running
|
}
|
else
|
{
|
purger = cnPurger.getAndSet(null);
|
if (purger != null)
|
{
|
purger.initiateShutdown();
|
}
|
}
|
}
|
|
/** {@inheritDoc} */
|
@Override
|
public void setComputeChangeNumber(final boolean computeChangeNumber)
|
throws ChangelogException
|
{
|
if (computeChangeNumber)
|
{
|
startIndexer(replicationEnv.getChangelogState());
|
}
|
else
|
{
|
final ChangeNumberIndexer indexer = cnIndexer.getAndSet(null);
|
if (indexer != null)
|
{
|
indexer.initiateShutdown();
|
}
|
}
|
}
|
|
private void startIndexer(final ChangelogState changelogState)
|
{
|
final ChangeNumberIndexer indexer = new ChangeNumberIndexer(this, changelogState);
|
if (cnIndexer.compareAndSet(null, indexer))
|
{
|
indexer.start();
|
}
|
}
|
|
/** {@inheritDoc} */
|
@Override
|
public long getDomainLatestTrimDate(final DN baseDN)
|
{
|
return latestPurgeDate;
|
}
|
|
/** {@inheritDoc} */
|
@Override
|
public ChangeNumberIndexDB getChangeNumberIndexDB()
|
{
|
synchronized (cnIndexDBLock)
|
{
|
if (cnIndexDB == null)
|
{
|
try
|
{
|
cnIndexDB = new JEChangeNumberIndexDB(replicationEnv);
|
}
|
catch (Exception e)
|
{
|
logger.traceException(e);
|
logger.error(ERR_CHANGENUMBER_DATABASE, e.getLocalizedMessage());
|
}
|
}
|
return cnIndexDB;
|
}
|
}
|
|
/** {@inheritDoc} */
|
@Override
|
public ReplicationDomainDB getReplicationDomainDB()
|
{
|
return this;
|
}
|
|
/** {@inheritDoc} */
|
@Override
|
public MultiDomainDBCursor getCursorFrom(final MultiDomainServerState startState,
|
final PositionStrategy positionStrategy) throws ChangelogException
|
{
|
final MultiDomainDBCursor cursor = new MultiDomainDBCursor(this, positionStrategy);
|
registeredMultiDomainCursors.add(cursor);
|
for (DN baseDN : domainToReplicaDBs.keySet())
|
{
|
cursor.addDomain(baseDN, startState.getServerState(baseDN));
|
}
|
return cursor;
|
}
|
|
/** {@inheritDoc} */
|
@Override
|
public DBCursor<UpdateMsg> getCursorFrom(final DN baseDN, final ServerState startState,
|
final PositionStrategy positionStrategy) throws ChangelogException
|
{
|
final DomainDBCursor cursor = newDomainDBCursor(baseDN, positionStrategy);
|
for (int serverId : getDomainMap(baseDN).keySet())
|
{
|
// get the last already sent CSN from that server to get a cursor
|
final CSN lastCSN = startState != null ? startState.getCSN(serverId) : null;
|
cursor.addReplicaDB(serverId, lastCSN);
|
}
|
return cursor;
|
}
|
|
private DomainDBCursor newDomainDBCursor(final DN baseDN, final PositionStrategy positionStrategy)
|
{
|
synchronized (registeredDomainCursors)
|
{
|
final DomainDBCursor cursor = new DomainDBCursor(baseDN, this, positionStrategy);
|
List<DomainDBCursor> cursors = registeredDomainCursors.get(baseDN);
|
if (cursors == null)
|
{
|
cursors = new ArrayList<DomainDBCursor>();
|
registeredDomainCursors.put(baseDN, cursors);
|
}
|
cursors.add(cursor);
|
return cursor;
|
}
|
}
|
|
private CSN getOfflineCSN(DN baseDN, int serverId, CSN startAfterCSN)
|
{
|
final MultiDomainServerState offlineReplicas =
|
replicationEnv.getChangelogState().getOfflineReplicas();
|
final CSN offlineCSN = offlineReplicas.getCSN(baseDN, serverId);
|
if (offlineCSN != null
|
&& (startAfterCSN == null || startAfterCSN.isOlderThan(offlineCSN)))
|
{
|
return offlineCSN;
|
}
|
return null;
|
}
|
|
/** {@inheritDoc} */
|
@Override
|
public DBCursor<UpdateMsg> getCursorFrom(final DN baseDN, final int serverId, final CSN startCSN,
|
final PositionStrategy positionStrategy) throws ChangelogException
|
{
|
final JEReplicaDB replicaDB = getReplicaDB(baseDN, serverId);
|
if (replicaDB != null)
|
{
|
final DBCursor<UpdateMsg> cursor = replicaDB.generateCursorFrom(startCSN, positionStrategy);
|
final CSN offlineCSN = getOfflineCSN(baseDN, serverId, startCSN);
|
final Pair<DN, Integer> replicaID = Pair.of(baseDN, serverId);
|
final ReplicaCursor replicaCursor = new ReplicaCursor(cursor, offlineCSN, replicaID, this);
|
|
synchronized (replicaCursors)
|
{
|
List<ReplicaCursor> cursors = replicaCursors.get(replicaID);
|
if (cursors == null)
|
{
|
cursors = new ArrayList<ReplicaCursor>();
|
replicaCursors.put(replicaID, cursors);
|
}
|
cursors.add(replicaCursor);
|
}
|
|
return replicaCursor;
|
}
|
return EMPTY_CURSOR_REPLICA_DB;
|
}
|
|
/** {@inheritDoc} */
|
@Override
|
public void unregisterCursor(final DBCursor<?> cursor)
|
{
|
if (cursor instanceof MultiDomainDBCursor)
|
{
|
registeredMultiDomainCursors.remove(cursor);
|
}
|
else if (cursor instanceof DomainDBCursor)
|
{
|
final DomainDBCursor domainCursor = (DomainDBCursor) cursor;
|
synchronized (registeredMultiDomainCursors)
|
{
|
final List<DomainDBCursor> cursors = registeredDomainCursors.get(domainCursor.getBaseDN());
|
if (cursors != null)
|
{
|
cursors.remove(cursor);
|
}
|
}
|
}
|
else if (cursor instanceof ReplicaCursor)
|
{
|
final ReplicaCursor replicaCursor = (ReplicaCursor) cursor;
|
final List<ReplicaCursor> cursors = replicaCursors.get(replicaCursor.getReplicaID());
|
if (cursors != null)
|
{
|
cursors.remove(cursor);
|
}
|
}
|
}
|
|
/** {@inheritDoc} */
|
@Override
|
public boolean publishUpdateMsg(final DN baseDN, final UpdateMsg updateMsg) throws ChangelogException
|
{
|
final CSN csn = updateMsg.getCSN();
|
final Pair<JEReplicaDB, Boolean> pair = getOrCreateReplicaDB(baseDN,
|
csn.getServerId(), replicationServer);
|
final JEReplicaDB replicaDB = pair.getFirst();
|
replicaDB.add(updateMsg);
|
|
final ChangeNumberIndexer indexer = cnIndexer.get();
|
if (indexer != null)
|
{
|
notifyReplicaOnline(indexer, baseDN, updateMsg.getCSN().getServerId());
|
indexer.publishUpdateMsg(baseDN, updateMsg);
|
}
|
return pair.getSecond(); // replica DB was created
|
}
|
|
/** {@inheritDoc} */
|
@Override
|
public void replicaHeartbeat(final DN baseDN, final CSN heartbeatCSN) throws ChangelogException
|
{
|
final ChangeNumberIndexer indexer = cnIndexer.get();
|
if (indexer != null)
|
{
|
notifyReplicaOnline(indexer, baseDN, heartbeatCSN.getServerId());
|
indexer.publishHeartbeat(baseDN, heartbeatCSN);
|
}
|
}
|
|
private void notifyReplicaOnline(final ChangeNumberIndexer indexer, final DN baseDN, final int serverId)
|
throws ChangelogException
|
{
|
if (indexer.isReplicaOffline(baseDN, serverId))
|
{
|
replicationEnv.notifyReplicaOnline(baseDN, serverId);
|
}
|
}
|
|
/** {@inheritDoc} */
|
@Override
|
public void notifyReplicaOffline(final DN baseDN, final CSN offlineCSN) throws ChangelogException
|
{
|
replicationEnv.notifyReplicaOffline(baseDN, offlineCSN);
|
final ChangeNumberIndexer indexer = cnIndexer.get();
|
if (indexer != null)
|
{
|
indexer.replicaOffline(baseDN, offlineCSN);
|
}
|
updateCursorsWithOfflineCSN(baseDN, offlineCSN.getServerId(), offlineCSN);
|
}
|
|
private void updateCursorsWithOfflineCSN(final DN baseDN, int serverId, final CSN offlineCSN)
|
{
|
final List<ReplicaCursor> cursors = replicaCursors.get(Pair.of(baseDN, serverId));
|
if (cursors != null && !cursors.isEmpty())
|
{
|
for (ReplicaCursor cursor : cursors)
|
{
|
cursor.setOfflineCSN(offlineCSN);
|
}
|
}
|
}
|
|
/**
|
* The thread purging the changelogDB on a regular interval. Records are
|
* purged from the changelogDB if they are older than a delay specified in
|
* seconds. The purge process works in two steps:
|
* <ol>
|
* <li>first purge the changeNumberIndexDB and retrieve information to drive
|
* replicaDBs purging</li>
|
* <li>proceed to purge each replicaDBs based on the information collected
|
* when purging the changeNumberIndexDB</li>
|
* </ol>
|
*/
|
private final class ChangelogDBPurger extends DirectoryThread
|
{
|
private static final int DEFAULT_SLEEP = 500;
|
|
protected ChangelogDBPurger()
|
{
|
super("changelog DB purger");
|
}
|
|
/** {@inheritDoc} */
|
@Override
|
public void run()
|
{
|
// initialize CNIndexDB
|
getChangeNumberIndexDB();
|
while (!isShutdownInitiated())
|
{
|
try
|
{
|
final long purgeTimestamp = TimeThread.getTime() - purgeDelayInMillis;
|
final CSN purgeCSN = new CSN(purgeTimestamp, 0, 0);
|
final CSN oldestNotPurgedCSN;
|
|
// next code assumes that the compute-change-number config
|
// never changes during the life time of an RS
|
if (!config.isComputeChangeNumber())
|
{
|
oldestNotPurgedCSN = purgeCSN;
|
}
|
else
|
{
|
final JEChangeNumberIndexDB localCNIndexDB = cnIndexDB;
|
if (localCNIndexDB == null)
|
{ // shutdown has been initiated
|
return;
|
}
|
|
oldestNotPurgedCSN = localCNIndexDB.purgeUpTo(purgeCSN);
|
if (oldestNotPurgedCSN == null)
|
{ // shutdown may have been initiated...
|
// ... or the change number index DB is empty,
|
// wait for new changes to come in.
|
|
// Note we cannot sleep for as long as the purge delay
|
// (3 days default), because we might receive late updates
|
// that will have to be purged before the purge delay elapses.
|
// This can particularly happen in case of network partitions.
|
jeFriendlySleep(DEFAULT_SLEEP);
|
continue;
|
}
|
}
|
|
for (final Map<Integer, JEReplicaDB> domainMap : domainToReplicaDBs.values())
|
{
|
for (final JEReplicaDB replicaDB : domainMap.values())
|
{
|
replicaDB.purgeUpTo(oldestNotPurgedCSN);
|
}
|
}
|
|
latestPurgeDate = purgeTimestamp;
|
|
jeFriendlySleep(computeSleepTimeUntilNextPurge(oldestNotPurgedCSN));
|
}
|
catch (InterruptedException e)
|
{
|
// shutdown initiated?
|
}
|
catch (Exception e)
|
{
|
logger.error(ERR_EXCEPTION_CHANGELOG_TRIM_FLUSH, stackTraceToSingleLineString(e));
|
if (replicationServer != null)
|
{
|
replicationServer.shutdown();
|
}
|
}
|
}
|
}
|
|
/**
|
* This method implements a sleep() that is friendly to Berkeley JE.
|
* <p>
|
* Originally, {@link Thread#sleep(long)} was used , but waking up a
|
* sleeping threads required calling {@link Thread#interrupt()}, and JE
|
* threw exceptions when invoked on interrupted threads.
|
* <p>
|
* The solution is to replace:
|
* <ol>
|
* <li> {@link Thread#sleep()} with {@link Object#wait(long)}</li>
|
* <li> {@link Thread#interrupt()} with {@link Object#notify()}</li>
|
* </ol>
|
*/
|
private void jeFriendlySleep(long millis) throws InterruptedException
|
{
|
if (!isShutdownInitiated())
|
{
|
synchronized (this)
|
{
|
if (!isShutdownInitiated())
|
{
|
wait(millis);
|
}
|
}
|
}
|
}
|
|
private long computeSleepTimeUntilNextPurge(CSN notPurgedCSN)
|
{
|
final long nextPurgeTime = notPurgedCSN.getTime();
|
final long currentPurgeTime = TimeThread.getTime() - purgeDelayInMillis;
|
if (currentPurgeTime <= nextPurgeTime)
|
{
|
// sleep till the next CSN to purge,
|
return nextPurgeTime - currentPurgeTime;
|
}
|
// wait a bit before purging more
|
return DEFAULT_SLEEP;
|
}
|
|
/** {@inheritDoc} */
|
@Override
|
public void initiateShutdown()
|
{
|
super.initiateShutdown();
|
synchronized (this)
|
{
|
notify(); // wake up the purger thread for faster shutdown
|
}
|
}
|
}
|
}
|
