/*
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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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* You can obtain a copy of the license at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE
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* or https://OpenDS.dev.java.net/OpenDS.LICENSE.
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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
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE. If applicable,
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* add the following below this CDDL HEADER, with the fields enclosed
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* by brackets "[]" replaced with your own identifying 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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* Copyright 2006-2010 Sun Microsystems, Inc.
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* Portions copyright 2011-2013 ForgeRock AS
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*/
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package org.opends.server.replication.server;
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import java.io.IOException;
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import java.io.UnsupportedEncodingException;
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import java.util.*;
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import java.util.concurrent.ConcurrentHashMap;
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import java.util.concurrent.ConcurrentLinkedQueue;
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import java.util.concurrent.CountDownLatch;
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import java.util.concurrent.TimeUnit;
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import java.util.concurrent.locks.ReentrantLock;
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import org.opends.messages.Category;
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import org.opends.messages.Message;
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import org.opends.messages.MessageBuilder;
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import org.opends.messages.Severity;
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import org.opends.server.admin.std.server.MonitorProviderCfg;
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import org.opends.server.api.MonitorProvider;
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import org.opends.server.core.DirectoryServer;
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import org.opends.server.loggers.debug.DebugTracer;
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import org.opends.server.replication.common.*;
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import org.opends.server.replication.protocol.*;
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import org.opends.server.replication.server.changelog.api.ChangelogException;
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import org.opends.server.replication.server.changelog.api.ReplicationIterator;
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import org.opends.server.types.*;
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import org.opends.server.util.TimeThread;
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import static org.opends.messages.ReplicationMessages.*;
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import static org.opends.server.loggers.ErrorLogger.*;
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import static org.opends.server.loggers.debug.DebugLogger.*;
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import static org.opends.server.util.StaticUtils.*;
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/**
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* This class define an in-memory cache that will be used to store
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* the messages that have been received from an LDAP server or
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* from another replication server and that should be forwarded to
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* other servers.
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*
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* The size of the cache is set by configuration.
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* If the cache becomes bigger than the configured size, the older messages
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* are removed and should they be needed again must be read from the backing
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* file
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*
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* it runs a thread that is responsible for saving the messages
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* received to the disk and for trimming them
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* Decision to trim can be based on disk space or age of the message
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*/
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public class ReplicationServerDomain extends MonitorProvider<MonitorProviderCfg>
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{
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private final String baseDn;
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/**
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* The Status analyzer that periodically verifies whether the connected DSs
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* are late.
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*/
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private StatusAnalyzer statusAnalyzer = null;
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/**
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* The monitoring publisher that periodically sends monitoring messages to the
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* topology.
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*/
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private MonitoringPublisher monitoringPublisher = null;
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/**
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* The following map contains one balanced tree for each replica ID to which
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* we are currently publishing the first update in the balanced tree is the
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* next change that we must push to this particular server.
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* <p>
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* We add new TreeSet in the HashMap when a new server register to this
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* replication server.
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*/
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private final Map<Integer, DataServerHandler> directoryServers =
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new ConcurrentHashMap<Integer, DataServerHandler>();
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/**
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* This map contains one ServerHandler for each replication servers with which
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* we are connected (so normally all the replication servers) the first update
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* in the balanced tree is the next change that we must push to this
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* particular server.
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* <p>
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* We add new TreeSet in the HashMap when a new replication server register to
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* this replication server.
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*/
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private final Map<Integer, ReplicationServerHandler> replicationServers =
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new ConcurrentHashMap<Integer, ReplicationServerHandler>();
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private final Queue<MessageHandler> otherHandlers =
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new ConcurrentLinkedQueue<MessageHandler>();
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/**
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* This map contains the List of updates received from each LDAP server.
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*/
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private final Map<Integer, DbHandler> sourceDbHandlers =
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new ConcurrentHashMap<Integer, DbHandler>();
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private ReplicationServer replicationServer;
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/** GenerationId management. */
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private volatile long generationId = -1;
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private boolean generationIdSavedStatus = false;
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/** The tracer object for the debug logger. */
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private static final DebugTracer TRACER = getTracer();
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// Monitor data management
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/**
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* The monitor data consolidated over the topology.
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*/
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private volatile MonitorData monitorData = new MonitorData();
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/**
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* This lock guards against multiple concurrent monitor data recalculation.
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*/
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private final Object pendingMonitorLock = new Object();
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/** Guarded by pendingMonitorLock. */
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private long monitorDataLastBuildDate = 0;
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/**
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* The set of replication servers which are already known to be slow to send
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* monitor data.
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* <p>
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* Guarded by pendingMonitorLock.
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*/
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private final Set<Integer> monitorDataLateServers = new HashSet<Integer>();
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/** This lock serializes updates to the pending monitor data. */
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private final Object pendingMonitorDataLock = new Object();
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/**
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* Monitor data which is currently being calculated. Guarded by
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* pendingMonitorDataLock.
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*/
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private MonitorData pendingMonitorData;
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/**
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* A set containing the IDs of servers from which we are currently expecting
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* monitor responses. When a response is received from a server we remove the
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* ID from this table, and count down the latch if the ID was in the table.
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* <p>
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* Guarded by pendingMonitorDataLock.
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*/
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private final Set<Integer> pendingMonitorDataServerIDs =
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new HashSet<Integer>();
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/**
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* This latch is non-null and is used in order to count incoming responses as
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* they arrive. Since incoming response may arrive at any time, even when
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* there is no pending monitor request, access to the latch must be guarded.
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* <p>
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* Guarded by pendingMonitorDataLock.
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*/
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private CountDownLatch pendingMonitorDataLatch = null;
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/**
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* TODO: Remote monitor data cache lifetime is 500ms/should be configurable.
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*/
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private final long monitorDataLifeTime = 500;
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/**
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* The needed info for each received assured update message we are waiting
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* acks for.
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* <p>
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* Key: a change number matching a received update message which requested
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* assured mode usage (either safe read or safe data mode)
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* <p>
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* Value: The object holding every info needed about the already received acks
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* as well as the acks to be received.
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*
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* @see ExpectedAcksInfo For more details, see ExpectedAcksInfo and its sub
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* classes javadoc.
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*/
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private final ConcurrentHashMap<ChangeNumber, ExpectedAcksInfo> waitingAcks =
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new ConcurrentHashMap<ChangeNumber, ExpectedAcksInfo>();
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/**
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* The timer used to run the timeout code (timer tasks) for the assured update
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* messages we are waiting acks for.
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*/
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private Timer assuredTimeoutTimer = null;
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/**
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* Counter used to purge the timer tasks references in assuredTimeoutTimer,
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* every n number of treated assured messages.
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*/
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private int assuredTimeoutTimerPurgeCounter = 0;
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private ServerState ctHeartbeatState = null;
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/**
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* Creates a new ReplicationServerDomain associated to the DN baseDn.
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*
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* @param baseDn The baseDn associated to the ReplicationServerDomain.
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* @param replicationServer the ReplicationServer that created this
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* replicationServer cache.
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*/
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public ReplicationServerDomain(
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String baseDn, ReplicationServer replicationServer)
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{
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this.baseDn = baseDn;
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this.replicationServer = replicationServer;
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this.assuredTimeoutTimer = new Timer("Replication server RS("
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+ replicationServer.getServerId()
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+ ") assured timer for domain \"" + baseDn + "\"", true);
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DirectoryServer.registerMonitorProvider(this);
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}
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/**
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* Add an update that has been received to the list of
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* updates that must be forwarded to all other servers.
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*
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* @param update The update that has been received.
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* @param sourceHandler The ServerHandler for the server from which the
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* update was received
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* @throws IOException When an IO exception happens during the update
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* processing.
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*/
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public void put(UpdateMsg update, ServerHandler sourceHandler)
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throws IOException
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{
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ChangeNumber cn = update.getChangeNumber();
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int id = cn.getServerId();
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sourceHandler.updateServerState(update);
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sourceHandler.incrementInCount();
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if (generationId < 0)
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{
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generationId = sourceHandler.getGenerationId();
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}
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/**
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* If this is an assured message (a message requesting ack), we must
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* construct the ExpectedAcksInfo object with the right number of expected
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* acks before posting message to the writers. Otherwise some writers may
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* have time to post, receive the ack and increment received ack counter
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* (kept in ExpectedAcksInfo object) and we could think the acknowledgment
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* is fully processed although it may be not (some other acks from other
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* servers are not yet arrived). So for that purpose we do a pre-loop
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* to determine to who we will post an assured message.
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* Whether the assured mode is safe read or safe data, we anyway do not
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* support the assured replication feature across topologies with different
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* group ids. The assured feature insures assured replication based on the
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* same locality (group id). For instance in double data center deployment
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* (2 group id usage) with assured replication enabled, an assured message
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* sent from data center 1 (group id = 1) will be sent to servers of both
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* data centers, but one will request and wait acks only from servers of the
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* data center 1.
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*/
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boolean assuredMessage = update.isAssured();
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PreparedAssuredInfo preparedAssuredInfo = null;
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if (assuredMessage)
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{
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// Assured feature is supported starting from replication protocol V2
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if (sourceHandler.getProtocolVersion() >=
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ProtocolVersion.REPLICATION_PROTOCOL_V2)
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{
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// According to assured sub-mode, prepare structures to keep track of
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// the acks we are interested in.
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AssuredMode assuredMode = update.getAssuredMode();
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if (assuredMode == AssuredMode.SAFE_DATA_MODE)
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{
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sourceHandler.incrementAssuredSdReceivedUpdates();
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preparedAssuredInfo = processSafeDataUpdateMsg(update, sourceHandler);
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} else if (assuredMode == AssuredMode.SAFE_READ_MODE)
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{
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sourceHandler.incrementAssuredSrReceivedUpdates();
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preparedAssuredInfo = processSafeReadUpdateMsg(update, sourceHandler);
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} else
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{
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// Unknown assured mode: should never happen
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Message errorMsg = ERR_RS_UNKNOWN_ASSURED_MODE.get(
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Integer.toString(replicationServer.getServerId()),
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assuredMode.toString(), baseDn, update.toString());
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logError(errorMsg);
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assuredMessage = false;
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}
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} else
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{
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assuredMessage = false;
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}
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}
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// look for the dbHandler that is responsible for the LDAP server which
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// generated the change.
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DbHandler dbHandler;
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synchronized (sourceDbHandlers)
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{
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dbHandler = sourceDbHandlers.get(id);
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if (dbHandler == null)
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{
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try
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{
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dbHandler = replicationServer.newDbHandler(id, baseDn);
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generationIdSavedStatus = true;
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} catch (ChangelogException e)
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{
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/*
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* Because of database problem we can't save any more changes
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* from at least one LDAP server.
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* This replicationServer therefore can't do it's job properly anymore
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* and needs to close all its connections and shutdown itself.
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*/
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MessageBuilder mb = new MessageBuilder();
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mb.append(ERR_CHANGELOG_SHUTDOWN_DATABASE_ERROR.get());
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mb.append(stackTraceToSingleLineString(e));
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logError(mb.toMessage());
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replicationServer.shutdown();
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return;
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}
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sourceDbHandlers.put(id, dbHandler);
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}
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}
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// Publish the messages to the source handler
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dbHandler.add(update);
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List<Integer> expectedServers = null;
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if (assuredMessage)
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{
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expectedServers = preparedAssuredInfo.expectedServers;
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if (expectedServers != null)
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{
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// Store the expected acks info into the global map.
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// The code for processing reception of acks for this update will update
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// info kept in this object and if enough acks received, it will send
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// back the final ack to the requester and remove the object from this
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// map
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// OR
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// The following timer will time out and send an timeout ack to the
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// requester if the acks are not received in time. The timer will also
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// remove the object from this map.
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waitingAcks.put(cn, preparedAssuredInfo.expectedAcksInfo);
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// Arm timer for this assured update message (wait for acks until it
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// times out)
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AssuredTimeoutTask assuredTimeoutTask = new AssuredTimeoutTask(cn);
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assuredTimeoutTimer.schedule(assuredTimeoutTask,
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replicationServer.getAssuredTimeout());
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// Purge timer every 100 treated messages
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assuredTimeoutTimerPurgeCounter++;
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if ((assuredTimeoutTimerPurgeCounter % 100) == 0)
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{
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assuredTimeoutTimer.purge();
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}
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}
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}
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if (expectedServers == null)
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{
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expectedServers = Collections.emptyList();
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}
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/**
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* The update message equivalent to the originally received update message,
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* but with assured flag disabled. This message is the one that should be
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* sent to non eligible servers for assured mode.
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* We need a clone like of the original message with assured flag off, to be
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* posted to servers we don't want to wait the ack from (not normal status
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* servers or servers with different group id). This must be done because
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* the posted message is a reference so each writer queue gets the same
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* reference, thus, changing the assured flag of an object is done for every
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* references posted on every writer queues. That is why we need a message
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* version with assured flag on and another one with assured flag off.
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*/
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NotAssuredUpdateMsg notAssuredUpdate = null;
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/*
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* Push the message to the replication servers
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*/
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if (sourceHandler.isDataServer())
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{
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for (ReplicationServerHandler handler : replicationServers.values())
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{
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/**
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* Ignore updates to RS with bad gen id
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* (no system managed status for a RS)
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*/
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if (isDifferentGenerationId(handler.getGenerationId()))
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{
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if (debugEnabled())
|
{
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TRACER.debugInfo("In Replication Server "
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+ replicationServer.getReplicationPort() + " " + baseDn + " "
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+ replicationServer.getServerId() + " for dn " + baseDn
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+ ", update " + update.getChangeNumber()
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+ " will not be sent to replication server "
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+ handler.getServerId() + " with generation id "
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+ handler.getGenerationId() + " different from local "
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+ "generation id " + generationId);
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}
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|
continue;
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}
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|
notAssuredUpdate = addUpdate(handler, update, notAssuredUpdate,
|
assuredMessage, expectedServers);
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}
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}
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/*
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* Push the message to the LDAP servers
|
*/
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for (DataServerHandler handler : directoryServers.values())
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{
|
// Don't forward the change to the server that just sent it
|
if (handler == sourceHandler)
|
{
|
continue;
|
}
|
|
/**
|
* Ignore updates to DS in bad BAD_GENID_STATUS or FULL_UPDATE_STATUS
|
*
|
* The RSD lock should not be taken here as it is acceptable to have a
|
* delay between the time the server has a wrong status and the fact we
|
* detect it: the updates that succeed to pass during this time will have
|
* no impact on remote server. But it is interesting to not saturate
|
* uselessly the network if the updates are not necessary so this check to
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* stop sending updates is interesting anyway. Not taking the RSD lock
|
* allows to have better performances in normal mode (most of the time).
|
*/
|
ServerStatus dsStatus = handler.getStatus();
|
if (dsStatus == ServerStatus.BAD_GEN_ID_STATUS
|
|| dsStatus == ServerStatus.FULL_UPDATE_STATUS)
|
{
|
if (debugEnabled())
|
{
|
if (dsStatus == ServerStatus.BAD_GEN_ID_STATUS)
|
{
|
TRACER.debugInfo("In " + this + " for dn " + baseDn + ", update "
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+ update.getChangeNumber()
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+ " will not be sent to directory server "
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+ handler.getServerId() + " with generation id "
|
+ handler.getGenerationId() + " different from local "
|
+ "generation id " + generationId);
|
}
|
if (dsStatus == ServerStatus.FULL_UPDATE_STATUS)
|
{
|
TRACER.debugInfo("In RS " + replicationServer.getServerId()
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+ " for dn " + baseDn + ", update " + update.getChangeNumber()
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+ " will not be sent to directory server "
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+ handler.getServerId() + " as it is in full update");
|
}
|
}
|
|
continue;
|
}
|
|
notAssuredUpdate = addUpdate(handler, update, notAssuredUpdate,
|
assuredMessage, expectedServers);
|
}
|
|
// Push the message to the other subscribing handlers
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for (MessageHandler handler : otherHandlers) {
|
handler.add(update);
|
}
|
}
|
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private NotAssuredUpdateMsg addUpdate(ServerHandler handler,
|
UpdateMsg update, NotAssuredUpdateMsg notAssuredUpdate,
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boolean assuredMessage, List<Integer> expectedServers)
|
throws UnsupportedEncodingException
|
{
|
if (assuredMessage)
|
{
|
// Assured mode: post an assured or not assured matching update
|
// message according to what has been computed for the destination server
|
if (expectedServers.contains(handler.getServerId()))
|
{
|
handler.add(update);
|
}
|
else
|
{
|
if (notAssuredUpdate == null)
|
{
|
notAssuredUpdate = new NotAssuredUpdateMsg(update);
|
}
|
handler.add(notAssuredUpdate);
|
}
|
}
|
else
|
{
|
handler.add(update);
|
}
|
return notAssuredUpdate;
|
}
|
|
/**
|
* Helper class to be the return type of a method that processes a just
|
* received assured update message:
|
* - processSafeReadUpdateMsg
|
* - processSafeDataUpdateMsg
|
* This is a facility to pack many interesting returned object.
|
*/
|
private class PreparedAssuredInfo
|
{
|
/**
|
* The list of servers identified as servers we are interested in
|
* receiving acks from. If this list is not null, then expectedAcksInfo
|
* should be not null.
|
* Servers that are not in this list are servers not eligible for an ack
|
* request.
|
*/
|
public List<Integer> expectedServers = null;
|
|
/**
|
* The constructed ExpectedAcksInfo object to be used when acks will be
|
* received. Null if expectedServers is null.
|
*/
|
public ExpectedAcksInfo expectedAcksInfo = null;
|
}
|
|
/**
|
* Process a just received assured update message in Safe Read mode. If the
|
* ack can be sent immediately, it is done here. This will also determine to
|
* which suitable servers an ack should be requested from, and which ones are
|
* not eligible for an ack request.
|
* This method is an helper method for the put method. Have a look at the put
|
* method for a better understanding.
|
* @param update The just received assured update to process.
|
* @param sourceHandler The ServerHandler for the server from which the
|
* update was received
|
* @return A suitable PreparedAssuredInfo object that contains every needed
|
* info to proceed with post to server writers.
|
* @throws IOException When an IO exception happens during the update
|
* processing.
|
*/
|
private PreparedAssuredInfo processSafeReadUpdateMsg(
|
UpdateMsg update, ServerHandler sourceHandler) throws IOException
|
{
|
ChangeNumber cn = update.getChangeNumber();
|
byte groupId = replicationServer.getGroupId();
|
byte sourceGroupId = sourceHandler.getGroupId();
|
List<Integer> expectedServers = new ArrayList<Integer>();
|
List<Integer> wrongStatusServers = new ArrayList<Integer>();
|
|
if (sourceGroupId == groupId)
|
// Assured feature does not cross different group ids
|
{
|
if (sourceHandler.isDataServer())
|
{
|
collectRSsEligibleForAssuredReplication(groupId, expectedServers);
|
}
|
|
// Look for DS eligible for assured
|
for (DataServerHandler handler : directoryServers.values())
|
{
|
// Don't forward the change to the server that just sent it
|
if (handler == sourceHandler)
|
{
|
continue;
|
}
|
if (handler.getGroupId() == groupId)
|
// No ack expected from a DS with different group id
|
{
|
ServerStatus serverStatus = handler.getStatus();
|
if (serverStatus == ServerStatus.NORMAL_STATUS)
|
{
|
expectedServers.add(handler.getServerId());
|
} else if (serverStatus == ServerStatus.DEGRADED_STATUS) {
|
// No ack expected from a DS with wrong status
|
wrongStatusServers.add(handler.getServerId());
|
}
|
/*
|
* else
|
* BAD_GEN_ID_STATUS or FULL_UPDATE_STATUS:
|
* We do not want this to be reported as an error to the update
|
* maker -> no pollution or potential misunderstanding when
|
* reading logs or monitoring and it was just administration (for
|
* instance new server is being configured in topo: it goes in bad
|
* gen then full update).
|
*/
|
}
|
}
|
}
|
|
// Return computed structures
|
PreparedAssuredInfo preparedAssuredInfo = new PreparedAssuredInfo();
|
if (expectedServers.size() > 0)
|
{
|
// Some other acks to wait for
|
preparedAssuredInfo.expectedAcksInfo = new SafeReadExpectedAcksInfo(cn,
|
sourceHandler, expectedServers, wrongStatusServers);
|
preparedAssuredInfo.expectedServers = expectedServers;
|
}
|
|
if (preparedAssuredInfo.expectedServers == null)
|
{
|
// No eligible servers found, send the ack immediately
|
sourceHandler.send(new AckMsg(cn));
|
}
|
|
return preparedAssuredInfo;
|
}
|
|
/**
|
* Process a just received assured update message in Safe Data mode. If the
|
* ack can be sent immediately, it is done here. This will also determine to
|
* which suitable servers an ack should be requested from, and which ones are
|
* not eligible for an ack request.
|
* This method is an helper method for the put method. Have a look at the put
|
* method for a better understanding.
|
* @param update The just received assured update to process.
|
* @param sourceHandler The ServerHandler for the server from which the
|
* update was received
|
* @return A suitable PreparedAssuredInfo object that contains every needed
|
* info to proceed with post to server writers.
|
* @throws IOException When an IO exception happens during the update
|
* processing.
|
*/
|
private PreparedAssuredInfo processSafeDataUpdateMsg(
|
UpdateMsg update, ServerHandler sourceHandler) throws IOException
|
{
|
ChangeNumber cn = update.getChangeNumber();
|
boolean interestedInAcks = false;
|
byte safeDataLevel = update.getSafeDataLevel();
|
byte groupId = replicationServer.getGroupId();
|
byte sourceGroupId = sourceHandler.getGroupId();
|
if (safeDataLevel < (byte) 1)
|
{
|
// Should never happen
|
Message errorMsg = ERR_UNKNOWN_ASSURED_SAFE_DATA_LEVEL.get(
|
Integer.toString(replicationServer.getServerId()),
|
Byte.toString(safeDataLevel), baseDn, update.toString());
|
logError(errorMsg);
|
} else if (sourceGroupId == groupId
|
// Assured feature does not cross different group IDS
|
&& isSameGenerationId(sourceHandler.getGenerationId()))
|
// Ignore assured updates from wrong generationId servers
|
{
|
if (sourceHandler.isDataServer())
|
{
|
if (safeDataLevel == (byte) 1)
|
{
|
/**
|
* Immediately return the ack for an assured message in safe data
|
* mode with safe data level 1, coming from a DS. No need to wait
|
* for more acks
|
*/
|
sourceHandler.send(new AckMsg(cn));
|
} else
|
{
|
/**
|
* level > 1 : We need further acks
|
* The message will be posted in assured mode to eligible
|
* servers. The embedded safe data level is not changed, and his
|
* value will be used by a remote RS to determine if he must send
|
* an ack (level > 1) or not (level = 1)
|
*/
|
interestedInAcks = true;
|
}
|
} else
|
{ // A RS sent us the safe data message, for sure no further ack to wait
|
/**
|
* Level 1 has already been reached so no further acks to wait.
|
* Just deal with level > 1
|
*/
|
if (safeDataLevel > (byte) 1)
|
{
|
sourceHandler.send(new AckMsg(cn));
|
}
|
}
|
}
|
|
List<Integer> expectedServers = new ArrayList<Integer>();
|
if (interestedInAcks && sourceHandler.isDataServer())
|
{
|
collectRSsEligibleForAssuredReplication(groupId, expectedServers);
|
}
|
|
// Return computed structures
|
PreparedAssuredInfo preparedAssuredInfo = new PreparedAssuredInfo();
|
int nExpectedServers = expectedServers.size();
|
if (interestedInAcks) // interestedInAcks so level > 1
|
{
|
if (nExpectedServers > 0)
|
{
|
// Some other acks to wait for
|
int sdl = update.getSafeDataLevel();
|
int neededAdditionalServers = sdl - 1;
|
// Change the number of expected acks if not enough available eligible
|
// servers: the level is a best effort thing, we do not want to timeout
|
// at every assured SD update for instance if a RS has had his gen id
|
// reseted
|
byte finalSdl = (nExpectedServers >= neededAdditionalServers) ?
|
(byte)sdl : // Keep level as it was
|
(byte)(nExpectedServers+1); // Change level to match what's available
|
preparedAssuredInfo.expectedAcksInfo = new SafeDataExpectedAcksInfo(cn,
|
sourceHandler, finalSdl, expectedServers);
|
preparedAssuredInfo.expectedServers = expectedServers;
|
} else
|
{
|
// level > 1 and source is a DS but no eligible servers found, send the
|
// ack immediately
|
sourceHandler.send(new AckMsg(cn));
|
}
|
}
|
|
return preparedAssuredInfo;
|
}
|
|
private void collectRSsEligibleForAssuredReplication(byte groupId,
|
List<Integer> expectedServers)
|
{
|
for (ReplicationServerHandler handler : replicationServers.values())
|
{
|
if (handler.getGroupId() == groupId
|
// No ack expected from a RS with different group id
|
&& isSameGenerationId(handler.getGenerationId())
|
// No ack expected from a RS with bad gen id
|
)
|
{
|
expectedServers.add(handler.getServerId());
|
}
|
}
|
}
|
|
private boolean isSameGenerationId(long generationId)
|
{
|
return this.generationId > 0 && this.generationId == generationId;
|
}
|
|
private boolean isDifferentGenerationId(long generationId)
|
{
|
return this.generationId > 0 && this.generationId != generationId;
|
}
|
|
/**
|
* Process an ack received from a given server.
|
*
|
* @param ack The ack message received.
|
* @param ackingServer The server handler of the server that sent the ack.
|
*/
|
public void processAck(AckMsg ack, ServerHandler ackingServer)
|
{
|
// Retrieve the expected acks info for the update matching the original
|
// sent update.
|
ChangeNumber cn = ack.getChangeNumber();
|
ExpectedAcksInfo expectedAcksInfo = waitingAcks.get(cn);
|
|
if (expectedAcksInfo != null)
|
{
|
// Prevent concurrent access from processAck() or AssuredTimeoutTask.run()
|
synchronized (expectedAcksInfo)
|
{
|
if (expectedAcksInfo.isCompleted())
|
{
|
// Timeout code is sending a timeout ack, do nothing and let him
|
// remove object from the map
|
return;
|
}
|
/**
|
*
|
* If this is the last ack we were waiting from, immediately create and
|
* send the final ack to the original server
|
*/
|
if (expectedAcksInfo.processReceivedAck(ackingServer, ack))
|
{
|
// Remove the object from the map as no more needed
|
waitingAcks.remove(cn);
|
AckMsg finalAck = expectedAcksInfo.createAck(false);
|
ServerHandler origServer = expectedAcksInfo.getRequesterServer();
|
try
|
{
|
origServer.send(finalAck);
|
} catch (IOException e)
|
{
|
/**
|
* An error happened trying the send back an ack to the server.
|
* Log an error and close the connection to this server.
|
*/
|
MessageBuilder mb = new MessageBuilder();
|
mb.append(ERR_RS_ERROR_SENDING_ACK.get(
|
Integer.toString(replicationServer.getServerId()),
|
Integer.toString(origServer.getServerId()),
|
cn.toString(), baseDn));
|
mb.append(stackTraceToSingleLineString(e));
|
logError(mb.toMessage());
|
stopServer(origServer, false);
|
}
|
// Mark the ack info object as completed to prevent potential timeout
|
// code parallel run
|
expectedAcksInfo.completed();
|
}
|
}
|
}
|
/* Else the timeout occurred for the update matching this change number
|
* and the ack with timeout error has probably already been sent.
|
*/
|
}
|
|
/**
|
* The code run when the timeout occurs while waiting for acks of the
|
* eligible servers. This basically sends a timeout ack (with any additional
|
* error info) to the original server that sent an assured update message.
|
*/
|
private class AssuredTimeoutTask extends TimerTask
|
{
|
private ChangeNumber cn = null;
|
|
/**
|
* Constructor for the timer task.
|
* @param cn The changeNumber of the assured update we are waiting acks for
|
*/
|
public AssuredTimeoutTask(ChangeNumber cn)
|
{
|
this.cn = cn;
|
}
|
|
/**
|
* Run when the assured timeout for an assured update message we are waiting
|
* acks for occurs.
|
*/
|
@Override
|
public void run()
|
{
|
ExpectedAcksInfo expectedAcksInfo = waitingAcks.get(cn);
|
|
if (expectedAcksInfo != null)
|
{
|
synchronized (expectedAcksInfo)
|
{
|
if (expectedAcksInfo.isCompleted())
|
{
|
// processAck() code is sending the ack, do nothing and let him
|
// remove object from the map
|
return;
|
}
|
// Remove the object from the map as no more needed
|
waitingAcks.remove(cn);
|
// Create the timeout ack and send him to the server the assured
|
// update message came from
|
AckMsg finalAck = expectedAcksInfo.createAck(true);
|
ServerHandler origServer = expectedAcksInfo.getRequesterServer();
|
if (debugEnabled())
|
{
|
TRACER.debugInfo("In RS " + replicationServer.getServerId()
|
+ " for "+ baseDn
|
+ ", sending timeout for assured update with change "
|
+ " number " + cn + " to server id "
|
+ origServer.getServerId());
|
}
|
try
|
{
|
origServer.send(finalAck);
|
} catch (IOException e)
|
{
|
/**
|
* An error happened trying the send back an ack to the server.
|
* Log an error and close the connection to this server.
|
*/
|
MessageBuilder mb = new MessageBuilder();
|
mb.append(ERR_RS_ERROR_SENDING_ACK.get(
|
Integer.toString(replicationServer.getServerId()),
|
Integer.toString(origServer.getServerId()),
|
cn.toString(), baseDn));
|
mb.append(stackTraceToSingleLineString(e));
|
logError(mb.toMessage());
|
stopServer(origServer, false);
|
}
|
// Increment assured counters
|
boolean safeRead =
|
expectedAcksInfo instanceof SafeReadExpectedAcksInfo;
|
if (safeRead)
|
{
|
origServer.incrementAssuredSrReceivedUpdatesTimeout();
|
} else
|
{
|
if (origServer.isDataServer())
|
{
|
origServer.incrementAssuredSdReceivedUpdatesTimeout();
|
}
|
}
|
// retrieve expected servers in timeout to increment their counter
|
List<Integer> serversInTimeout = expectedAcksInfo.getTimeoutServers();
|
for (Integer serverId : serversInTimeout)
|
{
|
ServerHandler expectedDSInTimeout = directoryServers.get(serverId);
|
ServerHandler expectedRSInTimeout =
|
replicationServers.get(serverId);
|
if (expectedDSInTimeout != null)
|
{
|
if (safeRead)
|
{
|
expectedDSInTimeout.incrementAssuredSrSentUpdatesTimeout();
|
} else
|
{
|
// No SD update sent to a DS (meaningless)
|
}
|
} else if (expectedRSInTimeout != null)
|
{
|
if (safeRead)
|
{
|
expectedRSInTimeout.incrementAssuredSrSentUpdatesTimeout();
|
}
|
else
|
{
|
expectedRSInTimeout.incrementAssuredSdSentUpdatesTimeout();
|
}
|
}
|
// else server disappeared ? Let's forget about it.
|
}
|
// Mark the ack info object as completed to prevent potential
|
// processAck() code parallel run
|
expectedAcksInfo.completed();
|
}
|
}
|
}
|
}
|
|
|
/**
|
* Stop operations with a list of replication servers.
|
*
|
* @param replServers the replication servers for which
|
* we want to stop operations
|
*/
|
public void stopReplicationServers(Collection<String> replServers)
|
{
|
for (ReplicationServerHandler handler : replicationServers.values())
|
{
|
if (replServers.contains(handler.getServerAddressURL()))
|
{
|
stopServer(handler, false);
|
}
|
}
|
}
|
|
/**
|
* Stop operations with all servers this domain is connected with (RS and DS).
|
*
|
* @param shutdown A boolean indicating if the stop is due to a
|
* shutdown condition.
|
*/
|
public void stopAllServers(boolean shutdown)
|
{
|
// Close session with other replication servers
|
for (ReplicationServerHandler serverHandler : replicationServers.values())
|
{
|
stopServer(serverHandler, shutdown);
|
}
|
|
// Close session with other LDAP servers
|
for (DataServerHandler serverHandler : directoryServers.values())
|
{
|
stopServer(serverHandler, shutdown);
|
}
|
}
|
|
/**
|
* Checks that a DS is not connected with same id.
|
*
|
* @param handler the DS we want to check
|
* @return true if this is not a duplicate server
|
*/
|
public boolean checkForDuplicateDS(DataServerHandler handler)
|
{
|
if (directoryServers.containsKey(handler.getServerId()))
|
{
|
// looks like two connected LDAP servers have the same serverId
|
Message message = ERR_DUPLICATE_SERVER_ID.get(
|
replicationServer.getMonitorInstanceName(),
|
directoryServers.get(handler.getServerId()).toString(),
|
handler.toString(), handler.getServerId());
|
logError(message);
|
return false;
|
}
|
return true;
|
}
|
|
/**
|
* Stop operations with a given server.
|
*
|
* @param handler the server for which we want to stop operations.
|
* @param shutdown A boolean indicating if the stop is due to a
|
* shutdown condition.
|
*/
|
public void stopServer(ServerHandler handler, boolean shutdown)
|
{
|
if (debugEnabled())
|
{
|
TRACER.debugInfo("In " + this.replicationServer.getMonitorInstanceName()
|
+ " domain=" + this + " stopServer() on the server handler "
|
+ handler.getMonitorInstanceName());
|
}
|
/*
|
* We must prevent deadlock on replication server domain lock, when for
|
* instance this code is called from dying ServerReader but also dying
|
* ServerWriter at the same time, or from a thread that wants to shut down
|
* the handler. So use a thread safe flag to know if the job must be done
|
* or not (is already being processed or not).
|
*/
|
if (!handler.engageShutdown())
|
// Only do this once (prevent other thread to enter here again)
|
{
|
if (!shutdown)
|
{
|
try
|
{
|
// Acquire lock on domain (see more details in comment of start()
|
// method of ServerHandler)
|
lock();
|
}
|
catch (InterruptedException ex)
|
{
|
// We can't deal with this here, so re-interrupt thread so that it is
|
// caught during subsequent IO.
|
Thread.currentThread().interrupt();
|
return;
|
}
|
}
|
|
try
|
{
|
// Stop useless monitoring publisher if no more RS or DS in domain
|
if ( (directoryServers.size() + replicationServers.size() )== 1)
|
{
|
if (debugEnabled())
|
{
|
TRACER.debugInfo("In " + replicationServer.getMonitorInstanceName()
|
+ " remote server " + handler.getMonitorInstanceName()
|
+ " is the last RS/DS to be stopped:"
|
+ " stopping monitoring publisher");
|
}
|
stopMonitoringPublisher();
|
}
|
|
if (handler.isReplicationServer())
|
{
|
if (replicationServers.containsKey(handler.getServerId()))
|
{
|
unregisterServerHandler(handler);
|
handler.shutdown();
|
|
// Check if generation id has to be reset
|
mayResetGenerationId();
|
if (!shutdown)
|
{
|
// Warn our DSs that a RS or DS has quit (does not use this
|
// handler as already removed from list)
|
buildAndSendTopoInfoToDSs(null);
|
}
|
}
|
} else if (directoryServers.containsKey(handler.getServerId()))
|
{
|
// If this is the last DS for the domain,
|
// shutdown the status analyzer
|
if (directoryServers.size() == 1)
|
{
|
if (debugEnabled())
|
{
|
TRACER.debugInfo("In "
|
+ replicationServer.getMonitorInstanceName()
|
+ " remote server " + handler.getMonitorInstanceName()
|
+ " is the last DS to be stopped: stopping status analyzer");
|
}
|
stopStatusAnalyzer();
|
}
|
|
unregisterServerHandler(handler);
|
handler.shutdown();
|
|
// Check if generation id has to be reset
|
mayResetGenerationId();
|
if (!shutdown)
|
{
|
// Update the remote replication servers with our list
|
// of connected LDAP servers
|
buildAndSendTopoInfoToRSs();
|
// Warn our DSs that a RS or DS has quit (does not use this
|
// handler as already removed from list)
|
buildAndSendTopoInfoToDSs(null);
|
}
|
} else if (otherHandlers.contains(handler))
|
{
|
unRegisterHandler(handler);
|
handler.shutdown();
|
}
|
}
|
catch(Exception e)
|
{
|
logError(Message.raw(Category.SYNC, Severity.NOTICE,
|
stackTraceToSingleLineString(e)));
|
}
|
finally
|
{
|
if (!shutdown)
|
{
|
release();
|
}
|
}
|
}
|
}
|
|
/**
|
* Stop the handler.
|
* @param handler The handler to stop.
|
*/
|
public void stopServer(MessageHandler handler)
|
{
|
if (debugEnabled())
|
{
|
TRACER.debugInfo("In " + this.replicationServer.getMonitorInstanceName()
|
+ " domain=" + this + " stopServer() on the message handler "
|
+ handler.getMonitorInstanceName());
|
}
|
/*
|
* We must prevent deadlock on replication server domain lock, when for
|
* instance this code is called from dying ServerReader but also dying
|
* ServerWriter at the same time, or from a thread that wants to shut down
|
* the handler. So use a thread safe flag to know if the job must be done
|
* or not (is already being processed or not).
|
*/
|
if (!handler.engageShutdown())
|
// Only do this once (prevent other thread to enter here again)
|
{
|
try
|
{
|
// Acquire lock on domain (see more details in comment of start() method
|
// of ServerHandler)
|
lock();
|
}
|
catch (InterruptedException ex)
|
{
|
// We can't deal with this here, so re-interrupt thread so that it is
|
// caught during subsequent IO.
|
Thread.currentThread().interrupt();
|
return;
|
}
|
|
try
|
{
|
if (otherHandlers.contains(handler))
|
{
|
unRegisterHandler(handler);
|
handler.shutdown();
|
}
|
}
|
catch(Exception e)
|
{
|
logError(Message.raw(Category.SYNC, Severity.NOTICE,
|
stackTraceToSingleLineString(e)));
|
}
|
finally
|
{
|
release();
|
}
|
}
|
}
|
|
/**
|
* Unregister this handler from the list of handlers registered to this
|
* domain.
|
* @param handler the provided handler to unregister.
|
*/
|
private void unregisterServerHandler(ServerHandler handler)
|
{
|
if (handler.isReplicationServer())
|
{
|
replicationServers.remove(handler.getServerId());
|
}
|
else
|
{
|
directoryServers.remove(handler.getServerId());
|
}
|
}
|
|
/**
|
* This method resets the generationId for this domain if there is no LDAP
|
* server currently connected in the whole topology on this domain and
|
* if the generationId has never been saved.
|
*
|
* - test emptiness of directoryServers list
|
* - traverse replicationServers list and test for each if DS are connected
|
* So it strongly relies on the directoryServers list
|
*/
|
private void mayResetGenerationId()
|
{
|
if (debugEnabled())
|
{
|
TRACER.debugInfo("In RS "
|
+ this.replicationServer.getMonitorInstanceName() + " for " + baseDn
|
+ " " + " mayResetGenerationId generationIdSavedStatus="
|
+ generationIdSavedStatus);
|
}
|
|
// If there is no more any LDAP server connected to this domain in the
|
// topology and the generationId has never been saved, then we can reset
|
// it and the next LDAP server to connect will become the new reference.
|
boolean lDAPServersConnectedInTheTopology = false;
|
if (directoryServers.isEmpty())
|
{
|
for (ReplicationServerHandler rsh : replicationServers.values())
|
{
|
if (generationId != rsh.getGenerationId())
|
{
|
if (debugEnabled())
|
{
|
TRACER.debugInfo("In RS "
|
+ this.replicationServer.getMonitorInstanceName() + " for "
|
+ baseDn + " " + " mayResetGenerationId skip RS"
|
+ rsh.getMonitorInstanceName() + " that has different genId");
|
}
|
} else if (rsh.hasRemoteLDAPServers())
|
{
|
lDAPServersConnectedInTheTopology = true;
|
|
if (debugEnabled())
|
{
|
TRACER.debugInfo("In RS "
|
+ this.replicationServer.getMonitorInstanceName()
|
+ " for "+ baseDn + " mayResetGenerationId RS"
|
+ rsh.getMonitorInstanceName()
|
+ " has servers connected to it"
|
+ " - will not reset generationId");
|
}
|
break;
|
}
|
}
|
} else
|
{
|
lDAPServersConnectedInTheTopology = true;
|
|
if (debugEnabled())
|
{
|
TRACER.debugInfo("In RS "
|
+ this.replicationServer.getMonitorInstanceName() + " for "
|
+ baseDn + " "
|
+ " has servers connected to it - will not reset generationId");
|
}
|
}
|
|
if (!lDAPServersConnectedInTheTopology && !this.generationIdSavedStatus
|
&& generationId != -1)
|
{
|
changeGenerationId(-1, false);
|
}
|
}
|
|
/**
|
* Checks that a remote RS is not already connected to this hosting RS.
|
* @param handler The handler for the remote RS.
|
* @return flag specifying whether the remote RS is already connected.
|
* @throws DirectoryException when a problem occurs.
|
*/
|
public boolean checkForDuplicateRS(ReplicationServerHandler handler)
|
throws DirectoryException
|
{
|
ReplicationServerHandler oldHandler =
|
replicationServers.get(handler.getServerId());
|
if (oldHandler != null)
|
{
|
if (oldHandler.getServerAddressURL().equals(
|
handler.getServerAddressURL()))
|
{
|
// this is the same server, this means that our ServerStart messages
|
// have been sent at about the same time and 2 connections
|
// have been established.
|
// Silently drop this connection.
|
return false;
|
}
|
else
|
{
|
// looks like two replication servers have the same serverId
|
// log an error message and drop this connection.
|
Message message = ERR_DUPLICATE_REPLICATION_SERVER_ID.get(
|
replicationServer.getMonitorInstanceName(), oldHandler.
|
getServerAddressURL(), handler.getServerAddressURL(),
|
handler.getServerId());
|
throw new DirectoryException(ResultCode.OTHER, message);
|
}
|
}
|
return true;
|
}
|
|
/**
|
* Get the next update that need to be sent to a given LDAP server.
|
* This call is blocking when no update is available or when dependencies
|
* do not allow to send the next available change
|
*
|
* @param handler The server handler for the target directory server.
|
*
|
* @return the update that must be forwarded
|
*/
|
public UpdateMsg take(ServerHandler handler)
|
{
|
/*
|
* Get the balanced tree that we use to sort the changes to be
|
* sent to the replica from the cookie
|
*
|
* The next change to send is always the first one in the tree
|
* So this methods simply need to check that dependencies are OK
|
* and update this replicaId RUV
|
*/
|
return handler.take();
|
}
|
|
/**
|
* Return a Set of String containing the lists of Replication servers
|
* connected to this server.
|
* @return the set of connected servers
|
*/
|
public Set<String> getChangelogs()
|
{
|
Set<String> results = new LinkedHashSet<String>();
|
for (ReplicationServerHandler handler : replicationServers.values())
|
{
|
results.add(handler.getServerAddressURL());
|
}
|
return results;
|
}
|
|
/**
|
* Return a set containing the server that produced update and known by
|
* this replicationServer from all over the topology,
|
* whatever directly connected of connected to another RS.
|
* @return a set containing the servers known by this replicationServer.
|
*/
|
public Set<Integer> getServers()
|
{
|
return sourceDbHandlers.keySet();
|
}
|
|
/**
|
* Returns as a set of String the list of LDAP servers connected to us.
|
* Each string is the serverID of a connected LDAP server.
|
*
|
* @return The set of connected LDAP servers
|
*/
|
public List<String> getConnectedLDAPservers()
|
{
|
List<String> results = new ArrayList<String>(0);
|
for (DataServerHandler handler : directoryServers.values())
|
{
|
results.add(String.valueOf(handler.getServerId()));
|
}
|
return results;
|
}
|
|
/**
|
* Creates and returns an iterator.
|
* When the iterator is not used anymore, the caller MUST call the
|
* ReplicationIterator.releaseCursor() method to free the resources
|
* and locks used by the ReplicationIterator.
|
*
|
* @param serverId Identifier of the server for which the iterator is created.
|
* @param changeNumber Starting point for the iterator.
|
* @return the created ReplicationIterator. Null when no DB is available
|
* for the provided server Id.
|
*/
|
public ReplicationIterator getChangelogIterator(int serverId,
|
ChangeNumber changeNumber)
|
{
|
DbHandler handler = sourceDbHandlers.get(serverId);
|
if (handler == null)
|
{
|
return null;
|
}
|
|
ReplicationIterator it;
|
try
|
{
|
it = handler.generateIterator(changeNumber);
|
}
|
catch (Exception e)
|
{
|
return null;
|
}
|
|
if (!it.next())
|
{
|
it.releaseCursor();
|
return null;
|
}
|
|
return it;
|
}
|
|
/**
|
* Count the number of changes in the replication changelog for the provided
|
* serverID, between 2 provided changenumbers.
|
* @param serverId Identifier of the server for which the iterator is created.
|
* @param from lower limit changenumber.
|
* @param to upper limit changenumber.
|
* @return the number of changes.
|
*/
|
public long getCount(int serverId, ChangeNumber from, ChangeNumber to)
|
{
|
DbHandler handler = sourceDbHandlers.get(serverId);
|
if (handler != null)
|
{
|
return handler.getCount(from, to);
|
}
|
return 0;
|
}
|
|
/**
|
* Returns the change count for that ReplicationServerDomain.
|
*
|
* @return the change count.
|
*/
|
public long getChangesCount()
|
{
|
long entryCount = 0;
|
for (DbHandler dbHandler : sourceDbHandlers.values())
|
{
|
entryCount += dbHandler.getChangesCount();
|
}
|
return entryCount;
|
}
|
|
/**
|
* Get the baseDn.
|
* @return Returns the baseDn.
|
*/
|
public String getBaseDn()
|
{
|
return baseDn;
|
}
|
|
/**
|
* Sets the provided DbHandler associated to the provided serverId.
|
*
|
* @param serverId the serverId for the server to which is
|
* associated the DbHandler.
|
* @param dbHandler the dbHandler associated to the serverId.
|
*
|
* @throws ChangelogException If a database error happened.
|
*/
|
public void setDbHandler(int serverId, DbHandler dbHandler)
|
throws ChangelogException
|
{
|
synchronized (sourceDbHandlers)
|
{
|
sourceDbHandlers.put(serverId, dbHandler);
|
}
|
}
|
|
/**
|
* Retrieves the destination handlers for a routable message.
|
*
|
* @param msg The message to route.
|
* @param senderHandler The handler of the server that published this message.
|
* @return The list of destination handlers.
|
*/
|
private List<ServerHandler> getDestinationServers(RoutableMsg msg,
|
ServerHandler senderHandler)
|
{
|
List<ServerHandler> servers = new ArrayList<ServerHandler>();
|
|
if (msg.getDestination() == RoutableMsg.THE_CLOSEST_SERVER)
|
{
|
// TODO Import from the "closest server" to be implemented
|
} else if (msg.getDestination() == RoutableMsg.ALL_SERVERS)
|
{
|
if (!senderHandler.isReplicationServer())
|
{
|
// Send to all replication servers with a least one remote
|
// server connected
|
for (ReplicationServerHandler rsh : replicationServers.values())
|
{
|
if (rsh.hasRemoteLDAPServers())
|
{
|
servers.add(rsh);
|
}
|
}
|
}
|
|
// Sends to all connected LDAP servers
|
for (DataServerHandler destinationHandler : directoryServers.values())
|
{
|
// Don't loop on the sender
|
if (destinationHandler == senderHandler)
|
{
|
continue;
|
}
|
servers.add(destinationHandler);
|
}
|
} else
|
{
|
// Destination is one server
|
DataServerHandler destinationHandler =
|
directoryServers.get(msg.getDestination());
|
if (destinationHandler != null)
|
{
|
servers.add(destinationHandler);
|
} else
|
{
|
// the targeted server is NOT connected
|
// Let's search for the replication server that MAY
|
// have the targeted server connected.
|
if (senderHandler.isDataServer())
|
{
|
for (ReplicationServerHandler h : replicationServers.values())
|
{
|
// Send to all replication servers with a least one remote
|
// server connected
|
if (h.isRemoteLDAPServer(msg.getDestination()))
|
{
|
servers.add(h);
|
}
|
}
|
}
|
}
|
}
|
return servers;
|
}
|
|
/**
|
* Processes a message coming from one server in the topology
|
* and potentially forwards it to one or all other servers.
|
*
|
* @param msg The message received and to be processed.
|
* @param senderHandler The server handler of the server that emitted
|
* the message.
|
*/
|
public void process(RoutableMsg msg, ServerHandler senderHandler)
|
{
|
// Test the message for which a ReplicationServer is expected
|
// to be the destination
|
if (!(msg instanceof InitializeRequestMsg) &&
|
!(msg instanceof InitializeTargetMsg) &&
|
!(msg instanceof InitializeRcvAckMsg) &&
|
!(msg instanceof EntryMsg) &&
|
!(msg instanceof DoneMsg) &&
|
(msg.getDestination() == this.replicationServer.getServerId()))
|
{
|
if (msg instanceof ErrorMsg)
|
{
|
ErrorMsg errorMsg = (ErrorMsg) msg;
|
logError(ERR_ERROR_MSG_RECEIVED.get(
|
errorMsg.getDetails()));
|
} else if (msg instanceof MonitorRequestMsg)
|
{
|
// If the request comes from a Directory Server we need to
|
// build the full list of all servers in the topology
|
// and send back a MonitorMsg with the full list of all the servers
|
// in the topology.
|
if (senderHandler.isDataServer())
|
{
|
// Monitoring information requested by a DS
|
MonitorMsg monitorMsg = createGlobalTopologyMonitorMsg(
|
msg.getDestination(), msg.getSenderID(), monitorData);
|
|
if (monitorMsg != null)
|
{
|
try
|
{
|
senderHandler.send(monitorMsg);
|
}
|
catch (IOException e)
|
{
|
// the connection was closed.
|
}
|
}
|
return;
|
} else
|
{
|
// Monitoring information requested by a RS
|
MonitorMsg monitorMsg =
|
createLocalTopologyMonitorMsg(msg.getDestination(),
|
msg.getSenderID());
|
|
if (monitorMsg != null)
|
{
|
try
|
{
|
senderHandler.send(monitorMsg);
|
} catch (Exception e)
|
{
|
// We log the error. The requestor will detect a timeout or
|
// any other failure on the connection.
|
logError(ERR_CHANGELOG_ERROR_SENDING_MSG.get(
|
Integer.toString(msg.getDestination())));
|
}
|
}
|
}
|
} else if (msg instanceof MonitorMsg)
|
{
|
MonitorMsg monitorMsg = (MonitorMsg) msg;
|
receivesMonitorDataResponse(monitorMsg, senderHandler.getServerId());
|
} else
|
{
|
logError(NOTE_ERR_ROUTING_TO_SERVER.get(
|
msg.getClass().getCanonicalName()));
|
|
MessageBuilder mb1 = new MessageBuilder();
|
mb1.append(
|
NOTE_ERR_ROUTING_TO_SERVER.get(msg.getClass().getCanonicalName()));
|
mb1.append("serverID:").append(msg.getDestination());
|
ErrorMsg errMsg = new ErrorMsg(msg.getSenderID(), mb1.toMessage());
|
try
|
{
|
senderHandler.send(errMsg);
|
} catch (IOException ioe1)
|
{
|
// an error happened on the sender session trying to recover
|
// from an error on the receiver session.
|
// Not much more we can do at this point.
|
}
|
}
|
return;
|
}
|
|
List<ServerHandler> servers = getDestinationServers(msg, senderHandler);
|
|
if (servers.isEmpty())
|
{
|
MessageBuilder mb = new MessageBuilder();
|
mb.append(ERR_NO_REACHABLE_PEER_IN_THE_DOMAIN.get(
|
this.baseDn, Integer.toString(msg.getDestination())));
|
mb.append(" In Replication Server=").append(
|
this.replicationServer.getMonitorInstanceName());
|
mb.append(" unroutable message =").append(msg.getClass().getSimpleName());
|
mb.append(" Details:routing table is empty");
|
ErrorMsg errMsg = new ErrorMsg(
|
this.replicationServer.getServerId(),
|
msg.getSenderID(),
|
mb.toMessage());
|
logError(mb.toMessage());
|
try
|
{
|
senderHandler.send(errMsg);
|
} catch (IOException ioe)
|
{
|
// TODO Handle error properly (sender timeout in addition)
|
/*
|
* An error happened trying to send an error msg to this server.
|
* Log an error and close the connection to this server.
|
*/
|
MessageBuilder mb2 = new MessageBuilder();
|
mb2.append(ERR_CHANGELOG_ERROR_SENDING_ERROR.get(this.toString()));
|
mb2.append(stackTraceToSingleLineString(ioe));
|
logError(mb2.toMessage());
|
stopServer(senderHandler, false);
|
}
|
} else
|
{
|
for (ServerHandler targetHandler : servers)
|
{
|
try
|
{
|
targetHandler.send(msg);
|
} catch (IOException ioe)
|
{
|
/*
|
* An error happened trying the send a routable message
|
* to its destination server.
|
* Send back an error to the originator of the message.
|
*/
|
MessageBuilder mb1 = new MessageBuilder();
|
mb1.append(ERR_NO_REACHABLE_PEER_IN_THE_DOMAIN.get(
|
this.baseDn, Integer.toString(msg.getDestination())));
|
mb1.append(" unroutable message =" + msg.getClass().getSimpleName());
|
mb1.append(" Details: " + ioe.getLocalizedMessage());
|
ErrorMsg errMsg = new ErrorMsg(
|
msg.getSenderID(), mb1.toMessage());
|
logError(mb1.toMessage());
|
try
|
{
|
senderHandler.send(errMsg);
|
} catch (IOException ioe1)
|
{
|
// an error happened on the sender session trying to recover
|
// from an error on the receiver session.
|
// We don't have much solution left beside closing the sessions.
|
stopServer(senderHandler, false);
|
stopServer(targetHandler, false);
|
}
|
// TODO Handle error properly (sender timeout in addition)
|
}
|
}
|
}
|
|
}
|
|
|
|
/**
|
* Creates a new monitor message including monitoring information for the
|
* whole topology.
|
*
|
* @param sender
|
* The sender of this message.
|
* @param destination
|
* The destination of this message.
|
* @param monitorData
|
* The domain monitor data which should be used for the message.
|
* @return The newly created and filled MonitorMsg. Null if a problem occurred
|
* during message creation.
|
*/
|
public MonitorMsg createGlobalTopologyMonitorMsg(
|
int sender, int destination, MonitorData monitorData)
|
{
|
MonitorMsg returnMsg =
|
new MonitorMsg(sender, destination);
|
|
returnMsg.setReplServerDbState(getDbServerState());
|
|
// Add the informations about the Replicas currently in
|
// the topology.
|
Iterator<Integer> it = monitorData.ldapIterator();
|
while (it.hasNext())
|
{
|
int replicaId = it.next();
|
returnMsg.setServerState(replicaId,
|
monitorData.getLDAPServerState(replicaId),
|
monitorData.getApproxFirstMissingDate(replicaId), true);
|
}
|
|
// Add the information about the Replication Servers
|
// currently in the topology.
|
it = monitorData.rsIterator();
|
while (it.hasNext())
|
{
|
int replicaId = it.next();
|
returnMsg.setServerState(replicaId,
|
monitorData.getRSStates(replicaId),
|
monitorData.getRSApproxFirstMissingDate(replicaId), false);
|
}
|
|
return returnMsg;
|
}
|
|
|
|
/**
|
* Creates a new monitor message including monitoring information for the
|
* topology directly connected to this RS. This includes information for: -
|
* local RS - all direct DSs - all direct RSs
|
*
|
* @param sender
|
* The sender of this message.
|
* @param destination
|
* The destination of this message.
|
* @return The newly created and filled MonitorMsg. Null if the current thread
|
* was interrupted while attempting to get the domain lock.
|
*/
|
public MonitorMsg createLocalTopologyMonitorMsg(int sender, int destination)
|
{
|
try
|
{
|
// Lock domain as we need to go through connected servers list
|
lock();
|
}
|
catch (InterruptedException e)
|
{
|
return null;
|
}
|
|
try
|
{
|
MonitorMsg monitorMsg = new MonitorMsg(sender, destination);
|
|
// Populate for each connected LDAP Server
|
// from the states stored in the serverHandler.
|
// - the server state
|
// - the older missing change
|
for (DataServerHandler lsh : this.directoryServers.values())
|
{
|
monitorMsg.setServerState(lsh.getServerId(),
|
lsh.getServerState(), lsh.getApproxFirstMissingDate(),
|
true);
|
}
|
|
// Same for the connected RS
|
for (ReplicationServerHandler rsh : this.replicationServers.values())
|
{
|
monitorMsg.setServerState(rsh.getServerId(),
|
rsh.getServerState(), rsh.getApproxFirstMissingDate(),
|
false);
|
}
|
|
// Populate the RS state in the msg from the DbState
|
monitorMsg.setReplServerDbState(getDbServerState());
|
return monitorMsg;
|
}
|
finally
|
{
|
release();
|
}
|
}
|
|
/**
|
* Shutdown this ReplicationServerDomain.
|
*/
|
public void shutdown()
|
{
|
DirectoryServer.deregisterMonitorProvider(this);
|
|
// Terminate the assured timer
|
assuredTimeoutTimer.cancel();
|
|
stopAllServers(true);
|
|
stopDbHandlers();
|
}
|
|
/**
|
* Stop the dbHandlers .
|
*/
|
private void stopDbHandlers()
|
{
|
// Shutdown the dbHandlers
|
synchronized (sourceDbHandlers)
|
{
|
for (DbHandler dbHandler : sourceDbHandlers.values())
|
{
|
dbHandler.shutdown();
|
}
|
sourceDbHandlers.clear();
|
}
|
}
|
|
/**
|
* Returns the ServerState describing the last change from this replica.
|
*
|
* @return The ServerState describing the last change from this replica.
|
*/
|
public ServerState getDbServerState()
|
{
|
ServerState serverState = new ServerState();
|
for (DbHandler db : sourceDbHandlers.values())
|
{
|
serverState.update(db.getLastChange());
|
}
|
return serverState;
|
}
|
|
/**
|
* {@inheritDoc}
|
*/
|
@Override
|
public String toString()
|
{
|
return "ReplicationServerDomain " + baseDn;
|
}
|
|
/**
|
* Send a TopologyMsg to all the connected directory servers in order to
|
* let them know the topology (every known DSs and RSs).
|
* @param notThisOne If not null, the topology message will not be sent to
|
* this passed server.
|
*/
|
public void buildAndSendTopoInfoToDSs(ServerHandler notThisOne)
|
{
|
for (DataServerHandler handler : directoryServers.values())
|
{
|
if (notThisOne == null || handler != notThisOne)
|
// All except passed one
|
{
|
for (int i=1; i<=2; i++)
|
{
|
if (!handler.shuttingDown()
|
&& handler.getStatus() != ServerStatus.NOT_CONNECTED_STATUS)
|
{
|
TopologyMsg topoMsg = createTopologyMsgForDS(handler.getServerId());
|
try
|
{
|
handler.sendTopoInfo(topoMsg);
|
break;
|
}
|
catch (IOException e)
|
{
|
if (i == 2)
|
{
|
Message message =
|
ERR_EXCEPTION_SENDING_TOPO_INFO
|
.get(baseDn, "directory", Integer.toString(handler
|
.getServerId()), e.getMessage());
|
logError(message);
|
}
|
}
|
}
|
sleep(100);
|
}
|
}
|
}
|
}
|
|
/**
|
* Send a TopologyMsg to all the connected replication servers
|
* in order to let them know our connected LDAP servers.
|
*/
|
public void buildAndSendTopoInfoToRSs()
|
{
|
TopologyMsg topoMsg = createTopologyMsgForRS();
|
for (ReplicationServerHandler handler : replicationServers.values())
|
{
|
for (int i=1; i<=2; i++)
|
{
|
if (!handler.shuttingDown()
|
&& handler.getStatus() != ServerStatus.NOT_CONNECTED_STATUS)
|
{
|
try
|
{
|
handler.sendTopoInfo(topoMsg);
|
break;
|
}
|
catch (IOException e)
|
{
|
if (i == 2)
|
{
|
Message message =
|
ERR_EXCEPTION_SENDING_TOPO_INFO.get(baseDn, "replication",
|
Integer.toString(handler.getServerId()), e.getMessage());
|
logError(message);
|
}
|
}
|
}
|
sleep(100);
|
}
|
}
|
}
|
|
private void sleep(int millis)
|
{
|
try { Thread.sleep(millis); } catch (InterruptedException e) {}
|
}
|
|
/**
|
* Creates a TopologyMsg filled with information to be sent to a remote RS.
|
* We send remote RS the info of every DS that are directly connected to us
|
* plus our own info as RS.
|
* @return A suitable TopologyMsg PDU to be sent to a peer RS
|
*/
|
public TopologyMsg createTopologyMsgForRS()
|
{
|
List<DSInfo> dsInfos = new ArrayList<DSInfo>();
|
|
// Go through every DSs
|
for (DataServerHandler serverHandler : directoryServers.values())
|
{
|
dsInfos.add(serverHandler.toDSInfo());
|
}
|
|
// Create info for the local RS
|
List<RSInfo> rsInfos = new ArrayList<RSInfo>();
|
RSInfo localRSInfo = toRSInfo(replicationServer, generationId);
|
rsInfos.add(localRSInfo);
|
|
return new TopologyMsg(dsInfos, rsInfos);
|
}
|
|
/**
|
* Creates a TopologyMsg filled with information to be sent to a DS.
|
* We send remote DS the info of every known DS and RS in the topology (our
|
* directly connected DSs plus the DSs connected to other RSs) except himself.
|
* Also put info related to local RS.
|
*
|
* @param destDsId The id of the DS the TopologyMsg PDU is to be sent to and
|
* that we must not include in the DS list.
|
* @return A suitable TopologyMsg PDU to be sent to a peer DS
|
*/
|
public TopologyMsg createTopologyMsgForDS(int destDsId)
|
{
|
List<DSInfo> dsInfos = new ArrayList<DSInfo>();
|
List<RSInfo> rsInfos = new ArrayList<RSInfo>();
|
|
// Go through every DSs (except recipient of msg)
|
for (DataServerHandler serverHandler : directoryServers.values())
|
{
|
if (serverHandler.getServerId() == destDsId)
|
{
|
continue;
|
}
|
dsInfos.add(serverHandler.toDSInfo());
|
}
|
|
// Add our own info (local RS)
|
RSInfo localRSInfo = toRSInfo(replicationServer, generationId);
|
rsInfos.add(localRSInfo);
|
|
// Go through every peer RSs (and get their connected DSs), also add info
|
// for RSs
|
for (ReplicationServerHandler serverHandler : replicationServers.values())
|
{
|
// Put RS info
|
rsInfos.add(serverHandler.toRSInfo());
|
|
serverHandler.addDSInfos(dsInfos);
|
}
|
|
return new TopologyMsg(dsInfos, rsInfos);
|
}
|
|
private RSInfo toRSInfo(ReplicationServer rs, long generationId)
|
{
|
return new RSInfo(rs.getServerId(), rs.getServerURL(), generationId,
|
rs.getGroupId(), rs.getWeight());
|
}
|
|
/**
|
* Get the generationId associated to this domain.
|
*
|
* @return The generationId
|
*/
|
public long getGenerationId()
|
{
|
return generationId;
|
}
|
|
/**
|
* Get the generationId saved status.
|
*
|
* @return The generationId saved status.
|
*/
|
public boolean getGenerationIdSavedStatus()
|
{
|
return generationIdSavedStatus;
|
}
|
|
|
/**
|
* Initialize the value of the generationID for this ReplicationServerDomain.
|
* This method is intended to be used for initialization at startup and
|
* simply stores the new value without any additional processing.
|
* For example it does not clear the change-log DBs
|
*
|
* @param generationId The new value of generationId.
|
*/
|
public void initGenerationID(long generationId)
|
{
|
synchronized (generationIDLock)
|
{
|
this.generationId = generationId;
|
this.generationIdSavedStatus = true;
|
}
|
}
|
|
/**
|
* Sets the provided value as the new in memory generationId.
|
* Also clear the changelog databases.
|
*
|
* @param generationId The new value of generationId.
|
* @param savedStatus The saved status of the generationId.
|
* @return The old generation id
|
*/
|
public long changeGenerationId(long generationId, boolean savedStatus)
|
{
|
synchronized (generationIDLock)
|
{
|
long oldGenerationId = this.generationId;
|
|
if (this.generationId != generationId)
|
{
|
// we are changing of genId
|
clearDbs();
|
|
this.generationId = generationId;
|
this.generationIdSavedStatus = savedStatus;
|
}
|
return oldGenerationId;
|
}
|
}
|
|
/**
|
* Resets the generationID.
|
*
|
* @param senderHandler The handler associated to the server
|
* that requested to reset the generationId.
|
* @param genIdMsg The reset generation ID msg received.
|
*/
|
public void resetGenerationId(ServerHandler senderHandler,
|
ResetGenerationIdMsg genIdMsg)
|
{
|
if (debugEnabled())
|
{
|
TRACER.debugInfo("In " + this + " Receiving ResetGenerationIdMsg from "
|
+ senderHandler.getServerId() + " for baseDn " + baseDn + ":\n"
|
+ genIdMsg);
|
}
|
|
try
|
{
|
// Acquire lock on domain (see more details in comment of start() method
|
// of ServerHandler)
|
lock();
|
}
|
catch (InterruptedException ex)
|
{
|
// We can't deal with this here, so re-interrupt thread so that it is
|
// caught during subsequent IO.
|
Thread.currentThread().interrupt();
|
return;
|
}
|
|
try
|
{
|
long newGenId = genIdMsg.getGenerationId();
|
|
if (newGenId != this.generationId)
|
{
|
changeGenerationId(newGenId, false);
|
}
|
else
|
{
|
// Order to take a gen id we already have, just ignore
|
if (debugEnabled())
|
{
|
TRACER.debugInfo("In " + this
|
+ " Reset generation id requested for baseDn " + baseDn
|
+ " but generation id was already " + this.generationId + ":\n"
|
+ genIdMsg);
|
}
|
}
|
|
// If we are the first replication server warned,
|
// then forwards the reset message to the remote replication servers
|
for (ServerHandler rsHandler : replicationServers.values())
|
{
|
try
|
{
|
// After we'll have sent the message , the remote RS will adopt
|
// the new genId
|
rsHandler.setGenerationId(newGenId);
|
if (senderHandler.isDataServer())
|
{
|
rsHandler.send(genIdMsg);
|
}
|
} catch (IOException e)
|
{
|
logError(ERR_EXCEPTION_FORWARDING_RESET_GEN_ID.get(baseDn,
|
e.getMessage()));
|
}
|
}
|
|
// Change status of the connected DSs according to the requested new
|
// reference generation id
|
for (DataServerHandler dsHandler : directoryServers.values())
|
{
|
try
|
{
|
dsHandler.changeStatusForResetGenId(newGenId);
|
} catch (IOException e)
|
{
|
logError(ERR_EXCEPTION_CHANGING_STATUS_AFTER_RESET_GEN_ID.get(baseDn,
|
Integer.toString(dsHandler.getServerId()),
|
e.getMessage()));
|
}
|
}
|
|
// Update every peers (RS/DS) with potential topology changes (status
|
// change). Rather than doing that each time a DS has a status change
|
// (consecutive to reset gen id message), we prefer advertising once for
|
// all after changes (less packet sent), here at the end of the reset msg
|
// treatment.
|
buildAndSendTopoInfoToDSs(null);
|
buildAndSendTopoInfoToRSs();
|
|
Message message = NOTE_RESET_GENERATION_ID.get(baseDn, newGenId);
|
logError(message);
|
}
|
catch(Exception e)
|
{
|
logError(Message.raw(Category.SYNC, Severity.NOTICE,
|
stackTraceToSingleLineString(e)));
|
}
|
finally
|
{
|
release();
|
}
|
}
|
|
/**
|
* Process message of a remote server changing his status.
|
* @param senderHandler The handler associated to the server
|
* that changed his status.
|
* @param csMsg The message containing the new status
|
*/
|
public void processNewStatus(DataServerHandler senderHandler,
|
ChangeStatusMsg csMsg)
|
{
|
if (debugEnabled())
|
{
|
TRACER.debugInfo(
|
"In RS " + getReplicationServer().getServerId() +
|
" Receiving ChangeStatusMsg from " + senderHandler.getServerId() +
|
" for baseDn " + baseDn + ":\n" + csMsg);
|
}
|
|
try
|
{
|
// Acquire lock on domain (see more details in comment of start() method
|
// of ServerHandler)
|
lock();
|
}
|
catch (InterruptedException ex)
|
{
|
// We can't deal with this here, so re-interrupt thread so that it is
|
// caught during subsequent IO.
|
Thread.currentThread().interrupt();
|
return;
|
}
|
|
try
|
{
|
ServerStatus newStatus = senderHandler.processNewStatus(csMsg);
|
if (newStatus == ServerStatus.INVALID_STATUS)
|
{
|
// Already logged an error in processNewStatus()
|
// just return not to forward a bad status to topology
|
return;
|
}
|
|
// Update every peers (RS/DS) with topology changes
|
buildAndSendTopoInfoToDSs(senderHandler);
|
buildAndSendTopoInfoToRSs();
|
|
Message message = NOTE_DIRECTORY_SERVER_CHANGED_STATUS.get(
|
senderHandler.getServerId(), baseDn, newStatus.toString());
|
logError(message);
|
}
|
catch(Exception e)
|
{
|
logError(Message.raw(Category.SYNC, Severity.NOTICE,
|
stackTraceToSingleLineString(e)));
|
}
|
finally
|
{
|
release();
|
}
|
}
|
|
/**
|
* Change the status of a directory server according to the event generated
|
* from the status analyzer.
|
* @param serverHandler The handler of the directory server to update
|
* @param event The event to be used for new status computation
|
* @return True if we have been interrupted (must stop), false otherwise
|
*/
|
public boolean changeStatusFromStatusAnalyzer(
|
DataServerHandler serverHandler, StatusMachineEvent event)
|
{
|
try
|
{
|
// Acquire lock on domain (see more details in comment of start() method
|
// of ServerHandler)
|
lock();
|
}
|
catch (InterruptedException ex)
|
{
|
// We have been interrupted for dying, from stopStatusAnalyzer
|
// to prevent deadlock in this situation:
|
// RS is being shutdown, and stopServer will call stopStatusAnalyzer.
|
// Domain lock is taken by shutdown thread while status analyzer thread
|
// is willing to change the status of a server at the same time so is
|
// waiting for the domain lock at the same time. As shutdown thread is
|
// waiting for analyzer thread death, a deadlock occurs. So we force
|
// interruption of the status analyzer thread death after 2 seconds if
|
// it has not finished (see StatusAnalyzer.waitForShutdown). This allows
|
// to have the analyzer thread taking the domain lock only when the
|
// status of a DS has to be changed. See more comments in run method of
|
// StatusAnalyzer.
|
if (debugEnabled())
|
{
|
TRACER.debugInfo("Status analyzer for domain " + baseDn
|
+ " has been interrupted when"
|
+ " trying to acquire domain lock for changing the status of DS "
|
+ serverHandler.getServerId());
|
}
|
return true;
|
}
|
|
try
|
{
|
ServerStatus newStatus = ServerStatus.INVALID_STATUS;
|
ServerStatus oldStatus = serverHandler.getStatus();
|
try
|
{
|
newStatus = serverHandler
|
.changeStatusFromStatusAnalyzer(event);
|
}
|
catch (IOException e)
|
{
|
logError(ERR_EXCEPTION_CHANGING_STATUS_FROM_STATUS_ANALYZER
|
.get(baseDn,
|
Integer.toString(serverHandler.getServerId()),
|
e.getMessage()));
|
}
|
|
if (newStatus == ServerStatus.INVALID_STATUS || newStatus == oldStatus)
|
{
|
// Change was impossible or already occurred (see StatusAnalyzer
|
// comments)
|
return false;
|
}
|
|
// Update every peers (RS/DS) with topology changes
|
buildAndSendTopoInfoToDSs(serverHandler);
|
buildAndSendTopoInfoToRSs();
|
}
|
catch (Exception e)
|
{
|
logError(Message.raw(Category.SYNC, Severity.NOTICE,
|
stackTraceToSingleLineString(e)));
|
}
|
finally
|
{
|
release();
|
}
|
|
return false;
|
}
|
|
/**
|
* Clears the Db associated with that domain.
|
*/
|
public void clearDbs()
|
{
|
// Reset the localchange and state db for the current domain
|
synchronized (sourceDbHandlers)
|
{
|
for (DbHandler dbHandler : sourceDbHandlers.values())
|
{
|
try
|
{
|
dbHandler.clear();
|
} catch (Exception e)
|
{
|
// TODO: i18n
|
MessageBuilder mb = new MessageBuilder();
|
mb.append(ERR_ERROR_CLEARING_DB.get(dbHandler.toString(),
|
e.getMessage() + " " +
|
stackTraceToSingleLineString(e)));
|
logError(mb.toMessage());
|
}
|
}
|
stopDbHandlers();
|
}
|
try
|
{
|
replicationServer.clearGenerationId(baseDn);
|
} catch (Exception e)
|
{
|
// TODO: i18n
|
logError(Message.raw(
|
"Exception caught while clearing generationId:" +
|
e.getLocalizedMessage()));
|
}
|
}
|
|
/**
|
* Returns whether the provided server is in degraded
|
* state due to the fact that the peer server has an invalid
|
* generationId for this domain.
|
*
|
* @param serverId The serverId for which we want to know the
|
* the state.
|
* @return Whether it is degraded or not.
|
*/
|
public boolean isDegradedDueToGenerationId(int serverId)
|
{
|
if (debugEnabled())
|
{
|
TRACER.debugInfo("In " + this.replicationServer.getMonitorInstanceName()
|
+ " baseDN=" + baseDn + " isDegraded serverId=" + serverId
|
+ " given local generation Id=" + this.generationId);
|
}
|
|
ServerHandler handler = replicationServers.get(serverId);
|
if (handler == null)
|
{
|
handler = directoryServers.get(serverId);
|
if (handler == null)
|
{
|
return false;
|
}
|
}
|
|
if (debugEnabled())
|
{
|
TRACER.debugInfo("In " + this.replicationServer.getMonitorInstanceName()
|
+ " baseDN=" + baseDn + " Compute degradation of serverId="
|
+ serverId + " LS server generation Id=" + handler.getGenerationId());
|
}
|
return handler.getGenerationId() != this.generationId;
|
}
|
|
/**
|
* Return the associated replication server.
|
* @return The replication server.
|
*/
|
public ReplicationServer getReplicationServer()
|
{
|
return replicationServer;
|
}
|
|
/**
|
* Process topology information received from a peer RS.
|
* @param topoMsg The just received topo message from remote RS
|
* @param handler The handler that received the message.
|
* @param allowResetGenId True for allowing to reset the generation id (
|
* when called after initial handshake)
|
* @throws IOException If an error occurred.
|
* @throws DirectoryException If an error occurred.
|
*/
|
public void receiveTopoInfoFromRS(TopologyMsg topoMsg,
|
ReplicationServerHandler handler,
|
boolean allowResetGenId)
|
throws IOException, DirectoryException
|
{
|
if (debugEnabled())
|
{
|
TRACER.debugInfo(
|
"In RS " + getReplicationServer().getServerId() +
|
" Receiving TopologyMsg from " + handler.getServerId() +
|
" for baseDn " + baseDn + ":\n" + topoMsg);
|
}
|
|
try
|
{
|
// Acquire lock on domain (see more details in comment of start() method
|
// of ServerHandler)
|
lock();
|
}
|
catch (InterruptedException ex)
|
{
|
// We can't deal with this here, so re-interrupt thread so that it is
|
// caught during subsequent IO.
|
Thread.currentThread().interrupt();
|
return;
|
}
|
|
try
|
{
|
/*
|
* Store DS connected to remote RS & update information about the peer RS
|
*/
|
handler.processTopoInfoFromRS(topoMsg);
|
|
/*
|
* Handle generation id
|
*/
|
if (allowResetGenId)
|
{
|
// Check if generation id has to be reseted
|
mayResetGenerationId();
|
if (generationId < 0)
|
{
|
generationId = handler.getGenerationId();
|
}
|
}
|
|
if (isDifferentGenerationId(handler.getGenerationId()))
|
{
|
Message message = WARN_BAD_GENERATION_ID_FROM_RS.get(handler
|
.getServerId(), handler.session
|
.getReadableRemoteAddress(), handler.getGenerationId(),
|
baseDn, getReplicationServer().getServerId(),
|
generationId);
|
logError(message);
|
|
ErrorMsg errorMsg = new ErrorMsg(
|
getReplicationServer().getServerId(),
|
handler.getServerId(),
|
message);
|
handler.send(errorMsg);
|
}
|
|
/*
|
* Sends the currently known topology information to every connected
|
* DS we have.
|
*/
|
buildAndSendTopoInfoToDSs(null);
|
}
|
catch(Exception e)
|
{
|
logError(Message.raw(Category.SYNC, Severity.NOTICE,
|
stackTraceToSingleLineString(e)));
|
}
|
finally
|
{
|
release();
|
}
|
}
|
|
/* =======================
|
* Monitor Data generation
|
* =======================
|
*/
|
|
/**
|
* Returns the latest monitor data available for this replication server
|
* domain.
|
*
|
* @return The latest monitor data available for this replication server
|
* domain, which is never {@code null}.
|
*/
|
MonitorData getDomainMonitorData()
|
{
|
return monitorData;
|
}
|
|
|
|
/**
|
* Recomputes the monitor data for this replication server domain.
|
*
|
* @return The recomputed monitor data for this replication server domain.
|
* @throws InterruptedException
|
* If this thread is interrupted while waiting for a response.
|
*/
|
MonitorData computeDomainMonitorData() throws InterruptedException
|
{
|
// Only allow monitor recalculation at a time.
|
synchronized (pendingMonitorLock)
|
{
|
if ((monitorDataLastBuildDate + monitorDataLifeTime) < TimeThread
|
.getTime())
|
{
|
try
|
{
|
// Prevent out of band monitor responses from updating our pending
|
// table until we are ready.
|
synchronized (pendingMonitorDataLock)
|
{
|
// Clear the pending monitor data.
|
pendingMonitorDataServerIDs.clear();
|
pendingMonitorData = new MonitorData();
|
|
// Initialize the monitor data.
|
initializePendingMonitorData();
|
|
// Send the monitor requests to the connected replication servers.
|
for (ReplicationServerHandler rs : replicationServers.values())
|
{
|
// Add server ID to pending table.
|
int serverId = rs.getServerId();
|
|
MonitorRequestMsg msg = new MonitorRequestMsg(
|
this.replicationServer.getServerId(), serverId);
|
try
|
{
|
rs.send(msg);
|
|
// Only register this server ID if we were able to send the
|
// message.
|
pendingMonitorDataServerIDs.add(serverId);
|
}
|
catch (IOException e)
|
{
|
// Log a message and do a best effort from here.
|
Message message = ERR_SENDING_REMOTE_MONITOR_DATA_REQUEST
|
.get(baseDn, serverId, e.getMessage());
|
logError(message);
|
}
|
}
|
|
// Create the pending response latch based on the number of expected
|
// monitor responses.
|
pendingMonitorDataLatch = new CountDownLatch(
|
pendingMonitorDataServerIDs.size());
|
}
|
|
// Wait for the responses to come back.
|
pendingMonitorDataLatch.await(5, TimeUnit.SECONDS);
|
|
// Log messages for replication servers that have gone or come back.
|
synchronized (pendingMonitorDataLock)
|
{
|
// Log servers that have come back.
|
for (int serverId : monitorDataLateServers)
|
{
|
// Ensure that we only log once per server: don't fill the
|
// error log with repeated messages.
|
if (!pendingMonitorDataServerIDs.contains(serverId))
|
{
|
logError(NOTE_MONITOR_DATA_RECEIVED.get(baseDn,
|
serverId));
|
}
|
}
|
|
// Log servers that have gone away.
|
for (int serverId : pendingMonitorDataServerIDs)
|
{
|
// Ensure that we only log once per server: don't fill the
|
// error log with repeated messages.
|
if (!monitorDataLateServers.contains(serverId))
|
{
|
logError(WARN_MISSING_REMOTE_MONITOR_DATA.get(baseDn,
|
serverId));
|
}
|
}
|
|
// Remember which servers were late this time.
|
monitorDataLateServers.clear();
|
monitorDataLateServers.addAll(pendingMonitorDataServerIDs);
|
}
|
|
// Store the new computed data as the reference
|
synchronized (pendingMonitorDataLock)
|
{
|
// Now we have the expected answers or an error occurred
|
pendingMonitorData.completeComputing();
|
monitorData = pendingMonitorData;
|
monitorDataLastBuildDate = TimeThread.getTime();
|
}
|
}
|
finally
|
{
|
synchronized (pendingMonitorDataLock)
|
{
|
// Clear pending state.
|
pendingMonitorData = null;
|
pendingMonitorDataLatch = null;
|
pendingMonitorDataServerIDs.clear();
|
}
|
}
|
}
|
}
|
|
return monitorData;
|
}
|
|
|
|
/**
|
* Start collecting global monitoring information for this
|
* ReplicationServerDomain.
|
*/
|
|
private void initializePendingMonitorData()
|
{
|
// Let's process our directly connected DS
|
// - in the ServerHandler for a given DS1, the stored state contains :
|
// - the max CN produced by DS1
|
// - the last CN consumed by DS1 from DS2..n
|
// - in the RSdomain/dbHandler, the built-in state contains :
|
// - the max CN produced by each server
|
// So for a given DS connected we can take the state and the max from
|
// the DS/state.
|
|
for (ServerHandler ds : directoryServers.values())
|
{
|
int serverID = ds.getServerId();
|
|
// the state comes from the state stored in the SH
|
ServerState dsState = ds.getServerState()
|
.duplicate();
|
|
// the max CN sent by that LS also comes from the SH
|
ChangeNumber maxcn = dsState.getChangeNumber(serverID);
|
if (maxcn == null)
|
{
|
// This directly connected LS has never produced any change
|
maxcn = new ChangeNumber(0, 0, serverID);
|
}
|
pendingMonitorData.setMaxCN(serverID, maxcn);
|
pendingMonitorData.setLDAPServerState(serverID, dsState);
|
pendingMonitorData.setFirstMissingDate(serverID,
|
ds.getApproxFirstMissingDate());
|
}
|
|
// Then initialize the max CN for the LS that produced something
|
// - from our own local db state
|
// - whatever they are directly or indirectly connected
|
ServerState dbServerState = getDbServerState();
|
pendingMonitorData.setRSState(replicationServer.getServerId(),
|
dbServerState);
|
for (int serverId : dbServerState) {
|
ChangeNumber storedCN = dbServerState.getChangeNumber(serverId);
|
pendingMonitorData.setMaxCN(serverId, storedCN);
|
}
|
}
|
|
|
|
/**
|
* Processes a Monitor message receives from a remote Replication Server and
|
* stores the data received.
|
*
|
* @param msg
|
* The message to be processed.
|
* @param serverId
|
* server handler that is receiving the message.
|
*/
|
private void receivesMonitorDataResponse(MonitorMsg msg, int serverId)
|
{
|
synchronized (pendingMonitorDataLock)
|
{
|
if (pendingMonitorData == null)
|
{
|
// This is a response for an earlier request whose computing is
|
// already complete.
|
logError(INFO_IGNORING_REMOTE_MONITOR_DATA.get(baseDn,
|
msg.getSenderID()));
|
return;
|
}
|
|
try
|
{
|
// Here is the RS state : list <serverID, lastChangeNumber>
|
// For each LDAP Server, we keep the max CN across the RSes
|
ServerState replServerState = msg.getReplServerDbState();
|
pendingMonitorData.setMaxCNs(replServerState);
|
|
// store the remote RS states.
|
pendingMonitorData.setRSState(msg.getSenderID(), replServerState);
|
|
// Store the remote LDAP servers states
|
Iterator<Integer> lsidIterator = msg.ldapIterator();
|
while (lsidIterator.hasNext())
|
{
|
int sid = lsidIterator.next();
|
ServerState dsServerState = msg.getLDAPServerState(sid);
|
pendingMonitorData.setMaxCNs(dsServerState);
|
pendingMonitorData.setLDAPServerState(sid, dsServerState);
|
pendingMonitorData.setFirstMissingDate(sid,
|
msg.getLDAPApproxFirstMissingDate(sid));
|
}
|
|
// Process the latency reported by the remote RSi on its connections
|
// to the other RSes
|
Iterator<Integer> rsidIterator = msg.rsIterator();
|
while (rsidIterator.hasNext())
|
{
|
int rsid = rsidIterator.next();
|
if (rsid == replicationServer.getServerId())
|
{
|
// this is the latency of the remote RSi regarding the current RS
|
// let's update the fmd of my connected LS
|
for (ServerHandler connectedlsh : directoryServers
|
.values())
|
{
|
int connectedlsid = connectedlsh.getServerId();
|
Long newfmd = msg.getRSApproxFirstMissingDate(rsid);
|
pendingMonitorData.setFirstMissingDate(connectedlsid, newfmd);
|
}
|
}
|
else
|
{
|
// this is the latency of the remote RSi regarding another RSj
|
// let's update the latency of the LSes connected to RSj
|
ReplicationServerHandler rsjHdr = replicationServers.get(rsid);
|
if (rsjHdr != null)
|
{
|
for (int remotelsid : rsjHdr.getConnectedDirectoryServerIds())
|
{
|
Long newfmd = msg.getRSApproxFirstMissingDate(rsid);
|
pendingMonitorData.setFirstMissingDate(remotelsid, newfmd);
|
}
|
}
|
}
|
}
|
}
|
catch (RuntimeException e)
|
{
|
// FIXME: do we really expect these???
|
logError(ERR_PROCESSING_REMOTE_MONITOR_DATA.get(e
|
.getMessage() + stackTraceToSingleLineString(e)));
|
}
|
finally
|
{
|
// Decreases the number of expected responses and potentially
|
// wakes up the waiting requester thread.
|
if (pendingMonitorDataServerIDs.remove(serverId))
|
{
|
pendingMonitorDataLatch.countDown();
|
}
|
}
|
}
|
}
|
|
/**
|
* Set the purge delay on all the db Handlers for this Domain
|
* of Replication.
|
*
|
* @param delay The new purge delay to use.
|
*/
|
public void setPurgeDelay(long delay)
|
{
|
for (DbHandler handler : sourceDbHandlers.values())
|
{
|
handler.setPurgeDelay(delay);
|
}
|
}
|
|
/**
|
* Get the map of connected DSs.
|
* @return The map of connected DSs
|
*/
|
public Map<Integer, DataServerHandler> getConnectedDSs()
|
{
|
return directoryServers;
|
}
|
|
/**
|
* Get the map of connected RSs.
|
* @return The map of connected RSs
|
*/
|
public Map<Integer, ReplicationServerHandler> getConnectedRSs()
|
{
|
return replicationServers;
|
}
|
|
|
/**
|
* A synchronization mechanism is created to insure exclusive access to the
|
* domain. The goal is to have a consistent view of the topology by locking
|
* the structures holding the topology view of the domain: directoryServers
|
* and replicationServers. When a connection is established with a peer DS or
|
* RS, the lock should be taken before updating these structures, then
|
* released. The same mechanism should be used when updating any data related
|
* to the view of the topology: for instance if the status of a DS is changed,
|
* the lock should be taken before updating the matching server handler and
|
* sending the topology messages to peers and released after.... This allows
|
* every member of the topology to have a consistent view of the topology and
|
* to be sure it will not miss some information.
|
* So the locking system must be called (not exhaustive list):
|
* - when connection established with a DS or RS
|
* - when connection ended with a DS or RS
|
* - when receiving a TopologyMsg and updating structures
|
* - when creating and sending a TopologyMsg
|
* - when a DS status is changing (ChangeStatusMsg received or sent)...
|
*/
|
private final ReentrantLock lock = new ReentrantLock();
|
|
/**
|
* This lock is used to protect the generationId variable.
|
*/
|
private final Object generationIDLock = new Object();
|
|
/**
|
* Tests if the current thread has the lock on this domain.
|
* @return True if the current thread has the lock.
|
*/
|
public boolean hasLock()
|
{
|
return lock.getHoldCount() > 0;
|
}
|
|
/**
|
* Takes the lock on this domain (blocking until lock can be acquired) or
|
* calling thread is interrupted.
|
* @throws java.lang.InterruptedException If interrupted.
|
*/
|
public void lock() throws InterruptedException
|
{
|
lock.lockInterruptibly();
|
}
|
|
/**
|
* Releases the lock on this domain.
|
*/
|
public void release()
|
{
|
lock.unlock();
|
}
|
|
/**
|
* Tries to acquire the lock on the domain within a given amount of time.
|
* @param timeout The amount of milliseconds to wait for acquiring the lock.
|
* @return True if the lock was acquired, false if timeout occurred.
|
* @throws java.lang.InterruptedException When call was interrupted.
|
*/
|
public boolean tryLock(long timeout) throws InterruptedException
|
{
|
return lock.tryLock(timeout, TimeUnit.MILLISECONDS);
|
}
|
|
/**
|
* Starts the status analyzer for the domain.
|
*/
|
public void startStatusAnalyzer()
|
{
|
if (statusAnalyzer == null)
|
{
|
int degradedStatusThreshold =
|
replicationServer.getDegradedStatusThreshold();
|
if (degradedStatusThreshold > 0) // 0 means no status analyzer
|
{
|
statusAnalyzer = new StatusAnalyzer(this, degradedStatusThreshold);
|
statusAnalyzer.start();
|
}
|
}
|
}
|
|
/**
|
* Stops the status analyzer for the domain.
|
*/
|
public void stopStatusAnalyzer()
|
{
|
if (statusAnalyzer != null)
|
{
|
statusAnalyzer.shutdown();
|
statusAnalyzer.waitForShutdown();
|
statusAnalyzer = null;
|
}
|
}
|
|
/**
|
* Tests if the status analyzer for this domain is running.
|
* @return True if the status analyzer is running, false otherwise.
|
*/
|
public boolean isRunningStatusAnalyzer()
|
{
|
return statusAnalyzer != null;
|
}
|
|
/**
|
* Update the status analyzer with the new threshold value.
|
* @param degradedStatusThreshold The new threshold value.
|
*/
|
public void updateStatusAnalyzer(int degradedStatusThreshold)
|
{
|
if (statusAnalyzer != null)
|
{
|
statusAnalyzer.setDegradedStatusThreshold(degradedStatusThreshold);
|
}
|
}
|
|
/**
|
* Starts the monitoring publisher for the domain.
|
*/
|
public void startMonitoringPublisher()
|
{
|
if (monitoringPublisher == null)
|
{
|
long period =
|
replicationServer.getMonitoringPublisherPeriod();
|
if (period > 0) // 0 means no monitoring publisher
|
{
|
monitoringPublisher = new MonitoringPublisher(this, period);
|
monitoringPublisher.start();
|
}
|
}
|
}
|
|
/**
|
* Stops the monitoring publisher for the domain.
|
*/
|
public void stopMonitoringPublisher()
|
{
|
if (monitoringPublisher != null)
|
{
|
monitoringPublisher.shutdown();
|
monitoringPublisher.waitForShutdown();
|
monitoringPublisher = null;
|
}
|
}
|
|
/**
|
* Tests if the monitoring publisher for this domain is running.
|
* @return True if the monitoring publisher is running, false otherwise.
|
*/
|
public boolean isRunningMonitoringPublisher()
|
{
|
return monitoringPublisher != null;
|
}
|
|
/**
|
* Update the monitoring publisher with the new period value.
|
* @param period The new period value.
|
*/
|
public void updateMonitoringPublisher(long period)
|
{
|
if (monitoringPublisher != null)
|
{
|
monitoringPublisher.setPeriod(period);
|
}
|
}
|
|
/**
|
* {@inheritDoc}
|
*/
|
@Override
|
public void initializeMonitorProvider(MonitorProviderCfg configuraiton)
|
{
|
// Nothing to do for now
|
}
|
|
/**
|
* {@inheritDoc}
|
*/
|
@Override
|
public String getMonitorInstanceName()
|
{
|
return "Replication server RS(" + replicationServer.getServerId() + ") "
|
+ replicationServer.getServerURL() + ",cn="
|
+ baseDn.replace(',', '_').replace('=', '_') + ",cn=Replication";
|
}
|
|
/**
|
* {@inheritDoc}
|
*/
|
@Override
|
public List<Attribute> getMonitorData()
|
{
|
// publish the server id and the port number.
|
List<Attribute> attributes = new ArrayList<Attribute>();
|
attributes.add(Attributes.create("replication-server-id",
|
String.valueOf(replicationServer.getServerId())));
|
attributes.add(Attributes.create("replication-server-port",
|
String.valueOf(replicationServer.getReplicationPort())));
|
|
// Add all the base DNs that are known by this replication server.
|
attributes.add(Attributes.create("domain-name", baseDn));
|
|
// Publish to monitor the generation ID by replicationServerDomain
|
attributes.add(Attributes.create("generation-id",
|
baseDn + " " + generationId));
|
|
MonitorData md = getDomainMonitorData();
|
|
// Missing changes
|
long missingChanges = md.getMissingChangesRS(replicationServer
|
.getServerId());
|
attributes.add(Attributes.create("missing-changes",
|
String.valueOf(missingChanges)));
|
|
return attributes;
|
}
|
|
/**
|
* Register in the domain an handler that subscribes to changes.
|
* @param handler the provided subscribing handler.
|
*/
|
public void registerHandler(MessageHandler handler)
|
{
|
this.otherHandlers.add(handler);
|
}
|
|
/**
|
* Unregister from the domain an handler.
|
* @param handler the provided unsubscribing handler.
|
* @return Whether this handler has been unregistered with success.
|
*/
|
public boolean unRegisterHandler(MessageHandler handler)
|
{
|
return this.otherHandlers.remove(handler);
|
}
|
|
/**
|
* Return the state that contain for each server the time of eligibility.
|
* @return the state.
|
*/
|
public ServerState getChangeTimeHeartbeatState()
|
{
|
if (ctHeartbeatState == null)
|
{
|
ctHeartbeatState = getDbServerState().duplicate();
|
}
|
return ctHeartbeatState;
|
}
|
|
/**
|
* Computes the eligible server state for the domain.
|
*
|
* <pre>
|
* s1 s2 s3
|
* -- -- --
|
* cn31
|
* cn15
|
*
|
* ----------------------------------------- eligibleCN
|
* cn14
|
* cn26
|
* cn13
|
* </pre>
|
*
|
* The eligibleState is : s1;cn14 / s2;cn26 / s3;cn31
|
*
|
* @param eligibleCN The provided eligibleCN.
|
* @return The computed eligible server state.
|
*/
|
public ServerState getEligibleState(ChangeNumber eligibleCN)
|
{
|
ServerState dbState = getDbServerState();
|
|
// The result is initialized from the dbState.
|
// From it, we don't want to keep the changes newer than eligibleCN.
|
ServerState result = dbState.duplicate();
|
|
if (eligibleCN != null)
|
{
|
for (int serverId : dbState)
|
{
|
DbHandler h = sourceDbHandlers.get(serverId);
|
ChangeNumber mostRecentDbCN = dbState.getChangeNumber(serverId);
|
try {
|
// Is the most recent change in the Db newer than eligible CN ?
|
// if yes (like cn15 in the example above, then we have to go back
|
// to the Db and look for the change older than eligible CN (cn14)
|
if (eligibleCN.olderOrEqual(mostRecentDbCN)) {
|
// let's try to seek the first change <= eligibleCN
|
ReplicationIterator ri = null;
|
try {
|
ri = h.generateIterator(eligibleCN);
|
if (ri != null && ri.getChange() != null) {
|
ChangeNumber newCN = ri.getChange().getChangeNumber();
|
result.update(newCN);
|
}
|
} catch (ChangelogException e) {
|
// there's no change older than eligibleCN (case of s3/cn31)
|
result.update(new ChangeNumber(0, 0, serverId));
|
} finally {
|
if (ri != null) {
|
ri.releaseCursor();
|
}
|
}
|
} else {
|
// for this serverId, all changes in the ChangelogDb are holder
|
// than eligibleCN , the most recent in the db is our guy.
|
result.update(mostRecentDbCN);
|
}
|
} catch (Exception e) {
|
Message errMessage = ERR_WRITER_UNEXPECTED_EXCEPTION.get(
|
" " + stackTraceToSingleLineString(e));
|
logError(errMessage);
|
TRACER.debugCaught(DebugLogLevel.ERROR, e);
|
}
|
}
|
}
|
|
if (debugEnabled())
|
{
|
TRACER
|
.debugInfo("In " + this + " getEligibleState() result is " + result);
|
}
|
return result;
|
}
|
|
/**
|
* Returns the start state of the domain, made of the first (oldest)
|
* change stored for each serverId.
|
* Note: Because the replication changelogdb trimming always keep one change
|
* whatever its date, the change contained in the returned state can be very
|
* old.
|
* @return the start state of the domain.
|
*/
|
public ServerState getStartState()
|
{
|
ServerState domainStartState = new ServerState();
|
for (DbHandler dbHandler : sourceDbHandlers.values())
|
{
|
domainStartState.update(dbHandler.getFirstChange());
|
}
|
return domainStartState;
|
}
|
|
/**
|
* Returns the eligibleCN for that domain - relies on the ChangeTimeHeartbeat
|
* state.
|
* For each DS, take the oldest CN from the changetime heartbeat state
|
* and from the changelog db last CN. Can be null.
|
* @return the eligible CN.
|
*/
|
public ChangeNumber getEligibleCN()
|
{
|
ChangeNumber eligibleCN = null;
|
|
for (DbHandler db : sourceDbHandlers.values())
|
{
|
// Consider this producer (DS/db).
|
int serverId = db.getServerId();
|
|
// Should it be considered for eligibility ?
|
ChangeNumber heartbeatLastCN =
|
getChangeTimeHeartbeatState().getChangeNumber(serverId);
|
|
// If the most recent UpdateMsg or CLHeartbeatMsg received is very old
|
// then the domain is considered down and not considered for eligibility
|
/*
|
if ((heartbeatLastDN != null) &&
|
(TimeThread.getTime()- heartbeatLastDN.getTime() > 5000))
|
{
|
if (debugEnabled())
|
TRACER.debugInfo("In " + this.getName() +
|
" Server " + sid
|
+ " is not considered for eligibility ... potentially down");
|
continue;
|
}
|
*/
|
|
boolean serverIdConnected = false;
|
if (directoryServers.containsKey(serverId))
|
{
|
serverIdConnected = true;
|
}
|
else
|
{
|
// not directly connected
|
for (ReplicationServerHandler rsh : replicationServers.values())
|
{
|
if (rsh.isRemoteLDAPServer(serverId))
|
{
|
serverIdConnected = true;
|
break;
|
}
|
}
|
}
|
if (!serverIdConnected)
|
{
|
if (debugEnabled())
|
{
|
TRACER.debugInfo("In " + "Replication Server "
|
+ replicationServer.getReplicationPort() + " " + baseDn + " "
|
+ replicationServer.getServerId() + " Server " + serverId
|
+ " is not considered for eligibility ... potentially down");
|
}
|
continue;
|
}
|
|
ChangeNumber changelogLastCN = db.getLastChange();
|
if (changelogLastCN != null
|
&& (eligibleCN == null || changelogLastCN.newer(eligibleCN)))
|
{
|
eligibleCN = changelogLastCN;
|
}
|
if (heartbeatLastCN != null
|
&& (eligibleCN == null || heartbeatLastCN.newer(eligibleCN)))
|
{
|
eligibleCN = heartbeatLastCN;
|
}
|
}
|
|
if (debugEnabled())
|
{
|
TRACER.debugInfo("In Replication Server "
|
+ replicationServer.getReplicationPort() + " " + baseDn + " "
|
+ replicationServer.getServerId()
|
+ " getEligibleCN() returns result =" + eligibleCN);
|
}
|
return eligibleCN;
|
}
|
|
|
/**
|
* Processes a ChangeTimeHeartbeatMsg received, by storing the CN (timestamp)
|
* value received, and forwarding the message to the other RSes.
|
* @param senderHandler The handler for the server that sent the heartbeat.
|
* @param msg The message to process.
|
*/
|
public void processChangeTimeHeartbeatMsg(ServerHandler senderHandler,
|
ChangeTimeHeartbeatMsg msg )
|
{
|
try
|
{
|
// Acquire lock on domain (see more details in comment of start() method
|
// of ServerHandler)
|
lock();
|
}
|
catch (InterruptedException ex)
|
{
|
// We can't deal with this here, so re-interrupt thread so that it is
|
// caught during subsequent IO.
|
Thread.currentThread().interrupt();
|
return;
|
}
|
|
try
|
{
|
storeReceivedCTHeartbeat(msg.getChangeNumber());
|
if (senderHandler.isDataServer())
|
{
|
// If we are the first replication server warned,
|
// then forwards the message to the remote replication servers
|
for (ReplicationServerHandler rsHandler : replicationServers.values())
|
{
|
try
|
{
|
if (rsHandler.getProtocolVersion() >=
|
ProtocolVersion.REPLICATION_PROTOCOL_V3)
|
{
|
rsHandler.send(msg);
|
}
|
}
|
catch (IOException e)
|
{
|
TRACER.debugCaught(DebugLogLevel.ERROR, e);
|
logError(ERR_CHANGELOG_ERROR_SENDING_MSG
|
.get("Replication Server "
|
+ replicationServer.getReplicationPort() + " "
|
+ baseDn + " " + replicationServer.getServerId()));
|
stopServer(rsHandler, false);
|
}
|
}
|
}
|
}
|
finally
|
{
|
release();
|
}
|
}
|
|
/**
|
* Store a change time value received from a data server.
|
* @param cn The provided change time.
|
*/
|
public void storeReceivedCTHeartbeat(ChangeNumber cn)
|
{
|
// TODO:May be we can spare processing by only storing CN (timestamp)
|
// instead of a server state.
|
getChangeTimeHeartbeatState().update(cn);
|
}
|
|
/**
|
* This methods count the changes, server by server :
|
* - from a serverState start point
|
* - to (inclusive) an end point (the provided endCN).
|
* @param startState The provided start server state.
|
* @param endCN The provided end change number.
|
* @return The number of changes between startState and endCN.
|
*/
|
public long getEligibleCount(ServerState startState, ChangeNumber endCN)
|
{
|
long res = 0;
|
|
for (int serverId : getDbServerState())
|
{
|
ChangeNumber startCN = startState.getChangeNumber(serverId);
|
long serverIdRes = getCount(serverId, startCN, endCN);
|
|
// The startPoint is excluded when counting the ECL eligible changes
|
if (startCN != null && serverIdRes > 0)
|
{
|
serverIdRes--;
|
}
|
|
res += serverIdRes;
|
}
|
return res;
|
}
|
|
/**
|
* This methods count the changes, server by server :
|
* - from a start CN
|
* - to (inclusive) an end point (the provided endCN).
|
* @param startCN The provided start changeNumber.
|
* @param endCN The provided end change number.
|
* @return The number of changes between startTime and endCN.
|
*/
|
public long getEligibleCount(ChangeNumber startCN, ChangeNumber endCN)
|
{
|
long res = 0;
|
for (int serverId : getDbServerState()) {
|
ChangeNumber lStartCN =
|
new ChangeNumber(startCN.getTime(), startCN.getSeqnum(), serverId);
|
res += getCount(serverId, lStartCN, endCN);
|
}
|
return res;
|
}
|
|
/**
|
* Get the latest (more recent) trim date of the changelog dbs associated
|
* to this domain.
|
* @return The latest trim date.
|
*/
|
public long getLatestDomainTrimDate()
|
{
|
long latest = 0;
|
for (DbHandler db : sourceDbHandlers.values())
|
{
|
if (latest == 0 || latest < db.getLatestTrimDate())
|
{
|
latest = db.getLatestTrimDate();
|
}
|
}
|
return latest;
|
}
|
}
|
