2 * Copyright (c) 2015 Brocade Communications Systems, Inc. and others. All rights reserved.
4 * This program and the accompanying materials are made available under the
5 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
6 * and is available at http://www.eclipse.org/legal/epl-v10.html
8 package org.opendaylight.controller.cluster.raft;
10 import akka.persistence.RecoveryCompleted;
11 import akka.persistence.SnapshotOffer;
12 import akka.persistence.SnapshotSelectionCriteria;
13 import com.google.common.base.Stopwatch;
14 import org.opendaylight.controller.cluster.DataPersistenceProvider;
15 import org.opendaylight.controller.cluster.PersistentDataProvider;
16 import org.opendaylight.controller.cluster.raft.base.messages.ApplyJournalEntries;
17 import org.opendaylight.controller.cluster.raft.base.messages.ApplyLogEntries;
18 import org.opendaylight.controller.cluster.raft.base.messages.DeleteEntries;
19 import org.opendaylight.controller.cluster.raft.base.messages.UpdateElectionTerm;
20 import org.opendaylight.controller.cluster.raft.behaviors.RaftActorBehavior;
21 import org.slf4j.Logger;
24 * Support class that handles persistence recovery for a RaftActor.
26 * @author Thomas Pantelis
28 class RaftActorRecoverySupport {
29 private final RaftActorContext context;
30 private final RaftActorBehavior currentBehavior;
31 private final RaftActorRecoveryCohort cohort;
33 private int currentRecoveryBatchCount;
34 private boolean dataRecoveredWithPersistenceDisabled;
36 private Stopwatch recoveryTimer;
37 private final Logger log;
39 RaftActorRecoverySupport(RaftActorContext context, RaftActorBehavior currentBehavior,
40 RaftActorRecoveryCohort cohort) {
41 this.context = context;
42 this.currentBehavior = currentBehavior;
44 this.log = context.getLogger();
47 boolean handleRecoveryMessage(Object message, PersistentDataProvider persistentProvider) {
48 log.trace("handleRecoveryMessage: {}", message);
50 boolean recoveryComplete = false;
51 DataPersistenceProvider persistence = context.getPersistenceProvider();
52 if (message instanceof org.opendaylight.controller.cluster.raft.RaftActor.UpdateElectionTerm) {
53 // Handle this message for backwards compatibility with pre-Lithium versions.
54 org.opendaylight.controller.cluster.raft.RaftActor.UpdateElectionTerm update =
55 (org.opendaylight.controller.cluster.raft.RaftActor.UpdateElectionTerm)message;
56 context.getTermInformation().update(update.getCurrentTerm(), update.getVotedFor());
57 } else if (message instanceof UpdateElectionTerm) {
58 context.getTermInformation().update(((UpdateElectionTerm) message).getCurrentTerm(),
59 ((UpdateElectionTerm) message).getVotedFor());
60 } else if(persistence.isRecoveryApplicable()) {
61 if (message instanceof SnapshotOffer) {
62 onRecoveredSnapshot((SnapshotOffer) message);
63 } else if (message instanceof ReplicatedLogEntry) {
64 onRecoveredJournalLogEntry((ReplicatedLogEntry) message);
65 } else if (message instanceof ApplyLogEntries) {
66 // Handle this message for backwards compatibility with pre-Lithium versions.
67 onRecoveredApplyLogEntries(((ApplyLogEntries) message).getToIndex());
68 } else if (message instanceof ApplyJournalEntries) {
69 onRecoveredApplyLogEntries(((ApplyJournalEntries) message).getToIndex());
70 } else if (message instanceof DeleteEntries) {
71 replicatedLog().removeFrom(((DeleteEntries) message).getFromIndex());
72 } else if (message instanceof org.opendaylight.controller.cluster.raft.RaftActor.DeleteEntries) {
73 // Handle this message for backwards compatibility with pre-Lithium versions.
74 replicatedLog().removeFrom(((org.opendaylight.controller.cluster.raft.RaftActor.DeleteEntries) message).getFromIndex());
75 } else if (message instanceof RecoveryCompleted) {
76 onRecoveryCompletedMessage();
77 recoveryComplete = true;
79 } else if (message instanceof RecoveryCompleted) {
80 recoveryComplete = true;
82 if(dataRecoveredWithPersistenceDisabled) {
83 // Data persistence is disabled but we recovered some data entries so we must have just
84 // transitioned to disabled or a persistence backup was restored. Either way, delete all the
85 // messages from the akka journal for efficiency and so that we do not end up with consistency
86 // issues in case persistence is -re-enabled.
87 persistentProvider.deleteMessages(persistentProvider.getLastSequenceNumber());
89 // Delete all the akka snapshots as they will not be needed
90 persistentProvider.deleteSnapshots(new SnapshotSelectionCriteria(scala.Long.MaxValue(),
91 scala.Long.MaxValue()));
93 // Since we cleaned out the journal, we need to re-write the current election info.
94 context.getTermInformation().updateAndPersist(context.getTermInformation().getCurrentTerm(),
95 context.getTermInformation().getVotedFor());
98 dataRecoveredWithPersistenceDisabled = true;
101 return recoveryComplete;
104 private ReplicatedLog replicatedLog() {
105 return context.getReplicatedLog();
108 private void initRecoveryTimer() {
109 if(recoveryTimer == null) {
110 recoveryTimer = Stopwatch.createStarted();
114 private void onRecoveredSnapshot(SnapshotOffer offer) {
115 if(log.isDebugEnabled()) {
116 log.debug("{}: SnapshotOffer called..", context.getId());
121 Snapshot snapshot = (Snapshot) offer.snapshot();
123 // Create a replicated log with the snapshot information
124 // The replicated log can be used later on to retrieve this snapshot
125 // when we need to install it on a peer
127 context.setReplicatedLog(ReplicatedLogImpl.newInstance(snapshot, context, currentBehavior));
128 context.setLastApplied(snapshot.getLastAppliedIndex());
129 context.setCommitIndex(snapshot.getLastAppliedIndex());
131 Stopwatch timer = Stopwatch.createStarted();
133 // Apply the snapshot to the actors state
134 cohort.applyRecoverySnapshot(snapshot.getState());
137 log.info("Recovery snapshot applied for {} in {}: snapshotIndex={}, snapshotTerm={}, journal-size={}",
138 context.getId(), timer.toString(), replicatedLog().getSnapshotIndex(),
139 replicatedLog().getSnapshotTerm(), replicatedLog().size());
142 private void onRecoveredJournalLogEntry(ReplicatedLogEntry logEntry) {
143 if(log.isDebugEnabled()) {
144 log.debug("{}: Received ReplicatedLogEntry for recovery: index: {}, size: {}", context.getId(),
145 logEntry.getIndex(), logEntry.size());
148 replicatedLog().append(logEntry);
151 private void onRecoveredApplyLogEntries(long toIndex) {
152 long lastUnappliedIndex = context.getLastApplied() + 1;
154 if(log.isDebugEnabled()) {
155 // it can happen that lastUnappliedIndex > toIndex, if the AJE is in the persistent journal
156 // but the entry itself has made it to that state and recovered via the snapshot
157 log.debug("{}: Received apply journal entries for recovery, applying to state: {} to {}",
158 context.getId(), lastUnappliedIndex, toIndex);
161 long lastApplied = lastUnappliedIndex - 1;
162 for (long i = lastUnappliedIndex; i <= toIndex; i++) {
163 ReplicatedLogEntry logEntry = replicatedLog().get(i);
164 if(logEntry != null) {
166 batchRecoveredLogEntry(logEntry);
168 // Shouldn't happen but cover it anyway.
169 log.error("Log entry not found for index {}", i);
174 context.setLastApplied(lastApplied);
175 context.setCommitIndex(lastApplied);
178 private void batchRecoveredLogEntry(ReplicatedLogEntry logEntry) {
181 int batchSize = context.getConfigParams().getJournalRecoveryLogBatchSize();
182 if(currentRecoveryBatchCount == 0) {
183 cohort.startLogRecoveryBatch(batchSize);
186 cohort.appendRecoveredLogEntry(logEntry.getData());
188 if(++currentRecoveryBatchCount >= batchSize) {
189 endCurrentLogRecoveryBatch();
193 private void endCurrentLogRecoveryBatch() {
194 cohort.applyCurrentLogRecoveryBatch();
195 currentRecoveryBatchCount = 0;
198 private void onRecoveryCompletedMessage() {
199 if(currentRecoveryBatchCount > 0) {
200 endCurrentLogRecoveryBatch();
203 String recoveryTime = "";
204 if(recoveryTimer != null) {
205 recoveryTimer.stop();
206 recoveryTime = " in " + recoveryTimer.toString();
207 recoveryTimer = null;
210 log.info("Recovery completed" + recoveryTime + " - Switching actor to Follower - " +
211 "Persistence Id = " + context.getId() +
212 " Last index in log = {}, snapshotIndex = {}, snapshotTerm = {}, " +
213 "journal-size = {}", replicatedLog().lastIndex(), replicatedLog().getSnapshotIndex(),
214 replicatedLog().getSnapshotTerm(), replicatedLog().size());