2 * Copyright (c) 2014 Cisco Systems, Inc. and others. All rights reserved.
3 * Copyright (c) 2015 Brocade Communications Systems, Inc. and others. All rights reserved.
5 * This program and the accompanying materials are made available under the
6 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
7 * and is available at http://www.eclipse.org/legal/epl-v10.html
10 package org.opendaylight.controller.cluster.raft;
12 import akka.actor.ActorRef;
13 import akka.actor.ActorSelection;
14 import akka.japi.Procedure;
15 import akka.persistence.SnapshotSelectionCriteria;
16 import com.google.common.annotations.VisibleForTesting;
17 import com.google.common.base.Objects;
18 import com.google.common.base.Optional;
19 import com.google.common.base.Supplier;
20 import com.google.common.collect.Lists;
21 import java.io.Serializable;
22 import java.util.Collection;
23 import java.util.HashMap;
24 import java.util.List;
26 import java.util.concurrent.TimeUnit;
27 import javax.annotation.Nonnull;
28 import org.apache.commons.lang3.time.DurationFormatUtils;
29 import org.opendaylight.controller.cluster.DataPersistenceProvider;
30 import org.opendaylight.controller.cluster.DelegatingPersistentDataProvider;
31 import org.opendaylight.controller.cluster.NonPersistentDataProvider;
32 import org.opendaylight.controller.cluster.PersistentDataProvider;
33 import org.opendaylight.controller.cluster.common.actor.AbstractUntypedPersistentActor;
34 import org.opendaylight.controller.cluster.notifications.LeaderStateChanged;
35 import org.opendaylight.controller.cluster.notifications.RoleChanged;
36 import org.opendaylight.controller.cluster.raft.base.messages.ApplyJournalEntries;
37 import org.opendaylight.controller.cluster.raft.base.messages.ApplyState;
38 import org.opendaylight.controller.cluster.raft.base.messages.InitiateCaptureSnapshot;
39 import org.opendaylight.controller.cluster.raft.base.messages.Replicate;
40 import org.opendaylight.controller.cluster.raft.base.messages.SwitchBehavior;
41 import org.opendaylight.controller.cluster.raft.behaviors.AbstractLeader;
42 import org.opendaylight.controller.cluster.raft.behaviors.DelegatingRaftActorBehavior;
43 import org.opendaylight.controller.cluster.raft.behaviors.Follower;
44 import org.opendaylight.controller.cluster.raft.behaviors.RaftActorBehavior;
45 import org.opendaylight.controller.cluster.raft.client.messages.FindLeader;
46 import org.opendaylight.controller.cluster.raft.client.messages.FindLeaderReply;
47 import org.opendaylight.controller.cluster.raft.client.messages.FollowerInfo;
48 import org.opendaylight.controller.cluster.raft.client.messages.GetOnDemandRaftState;
49 import org.opendaylight.controller.cluster.raft.client.messages.OnDemandRaftState;
50 import org.opendaylight.controller.cluster.raft.protobuff.client.messages.Payload;
51 import org.slf4j.Logger;
52 import org.slf4j.LoggerFactory;
55 * RaftActor encapsulates a state machine that needs to be kept synchronized
56 * in a cluster. It implements the RAFT algorithm as described in the paper
57 * <a href='https://ramcloud.stanford.edu/wiki/download/attachments/11370504/raft.pdf'>
58 * In Search of an Understandable Consensus Algorithm</a>
60 * RaftActor has 3 states and each state has a certain behavior associated
61 * with it. A Raft actor can behave as,
64 * <li> A Follower (or) </li>
65 * <li> A Candidate </li>
69 * A RaftActor MUST be a Leader in order to accept requests from clients to
70 * change the state of it's encapsulated state machine. Once a RaftActor becomes
71 * a Leader it is also responsible for ensuring that all followers ultimately
72 * have the same log and therefore the same state machine as itself.
75 * The current behavior of a RaftActor determines how election for leadership
76 * is initiated and how peer RaftActors react to request for votes.
79 * Each RaftActor also needs to know the current election term. It uses this
80 * information for a couple of things. One is to simply figure out who it
81 * voted for in the last election. Another is to figure out if the message
82 * it received to update it's state is stale.
85 * The RaftActor uses akka-persistence to store it's replicated log.
86 * Furthermore through it's behaviors a Raft Actor determines
89 * <li> when a log entry should be persisted </li>
90 * <li> when a log entry should be applied to the state machine (and) </li>
91 * <li> when a snapshot should be saved </li>
94 public abstract class RaftActor extends AbstractUntypedPersistentActor {
96 private static final long APPLY_STATE_DELAY_THRESHOLD_IN_NANOS = TimeUnit.MILLISECONDS.toNanos(50L); // 50 millis
98 protected final Logger LOG = LoggerFactory.getLogger(getClass());
101 * The current state determines the current behavior of a RaftActor
102 * A Raft Actor always starts off in the Follower State
104 private final DelegatingRaftActorBehavior currentBehavior = new DelegatingRaftActorBehavior();
107 * This context should NOT be passed directly to any other actor it is
108 * only to be consumed by the RaftActorBehaviors
110 private final RaftActorContextImpl context;
112 private final DelegatingPersistentDataProvider delegatingPersistenceProvider = new DelegatingPersistentDataProvider(null);
114 private RaftActorRecoverySupport raftRecovery;
116 private RaftActorSnapshotMessageSupport snapshotSupport;
118 private final BehaviorStateHolder reusableBehaviorStateHolder = new BehaviorStateHolder();
120 private final SwitchBehaviorSupplier reusableSwitchBehaviorSupplier = new SwitchBehaviorSupplier();
122 public RaftActor(String id, Map<String, String> peerAddresses,
123 Optional<ConfigParams> configParams, short payloadVersion) {
125 context = new RaftActorContextImpl(this.getSelf(),
126 this.getContext(), id, new ElectionTermImpl(delegatingPersistenceProvider, id, LOG),
127 -1, -1, peerAddresses,
128 (configParams.isPresent() ? configParams.get(): new DefaultConfigParamsImpl()),
129 delegatingPersistenceProvider, LOG);
131 context.setPayloadVersion(payloadVersion);
132 context.setReplicatedLog(ReplicatedLogImpl.newInstance(context, currentBehavior));
136 public void preStart() throws Exception {
137 LOG.info("Starting recovery for {} with journal batch size {}", persistenceId(),
138 context.getConfigParams().getJournalRecoveryLogBatchSize());
142 snapshotSupport = newRaftActorSnapshotMessageSupport();
146 public void postStop() {
147 if(currentBehavior.getDelegate() != null) {
149 currentBehavior.close();
150 } catch (Exception e) {
151 LOG.debug("{}: Error closing behavior {}", persistenceId(), currentBehavior.state());
159 public void handleRecover(Object message) {
160 if(raftRecovery == null) {
161 raftRecovery = newRaftActorRecoverySupport();
164 boolean recoveryComplete = raftRecovery.handleRecoveryMessage(message);
165 if(recoveryComplete) {
166 if(!persistence().isRecoveryApplicable()) {
167 // Delete all the messages from the akka journal so that we do not end up with consistency issues
168 // Note I am not using the dataPersistenceProvider and directly using the akka api here
169 deleteMessages(lastSequenceNr());
171 // Delete all the akka snapshots as they will not be needed
172 deleteSnapshots(new SnapshotSelectionCriteria(scala.Long.MaxValue(), scala.Long.MaxValue()));
175 onRecoveryComplete();
177 initializeBehavior();
183 protected RaftActorRecoverySupport newRaftActorRecoverySupport() {
184 return new RaftActorRecoverySupport(context, currentBehavior, getRaftActorRecoveryCohort());
187 protected void initializeBehavior(){
188 changeCurrentBehavior(new Follower(context));
191 protected void changeCurrentBehavior(RaftActorBehavior newBehavior){
192 reusableBehaviorStateHolder.init(getCurrentBehavior());
193 setCurrentBehavior(newBehavior);
194 handleBehaviorChange(reusableBehaviorStateHolder, getCurrentBehavior());
198 public void handleCommand(final Object message) {
199 if (message instanceof ApplyState){
200 ApplyState applyState = (ApplyState) message;
202 long elapsedTime = (System.nanoTime() - applyState.getStartTime());
203 if(elapsedTime >= APPLY_STATE_DELAY_THRESHOLD_IN_NANOS){
204 LOG.warn("ApplyState took more time than expected. Elapsed Time = {} ms ApplyState = {}",
205 TimeUnit.NANOSECONDS.toMillis(elapsedTime), applyState);
208 if(LOG.isDebugEnabled()) {
209 LOG.debug("{}: Applying state for log index {} data {}",
210 persistenceId(), applyState.getReplicatedLogEntry().getIndex(),
211 applyState.getReplicatedLogEntry().getData());
214 applyState(applyState.getClientActor(), applyState.getIdentifier(),
215 applyState.getReplicatedLogEntry().getData());
217 if (!hasFollowers()) {
218 // for single node, the capture should happen after the apply state
219 // as we delete messages from the persistent journal which have made it to the snapshot
220 // capturing the snapshot before applying makes the persistent journal and snapshot out of sync
221 // and recovery shows data missing
222 context.getReplicatedLog().captureSnapshotIfReady(applyState.getReplicatedLogEntry());
224 context.getSnapshotManager().trimLog(context.getLastApplied(), currentBehavior);
227 } else if (message instanceof ApplyJournalEntries){
228 ApplyJournalEntries applyEntries = (ApplyJournalEntries) message;
229 if(LOG.isDebugEnabled()) {
230 LOG.debug("{}: Persisting ApplyLogEntries with index={}", persistenceId(), applyEntries.getToIndex());
233 persistence().persist(applyEntries, NoopProcedure.instance());
235 } else if (message instanceof FindLeader) {
237 new FindLeaderReply(getLeaderAddress()),
240 } else if(message instanceof GetOnDemandRaftState) {
241 onGetOnDemandRaftStats();
242 } else if(message instanceof InitiateCaptureSnapshot) {
244 } else if(message instanceof SwitchBehavior){
245 switchBehavior(((SwitchBehavior) message));
246 } else if(!snapshotSupport.handleSnapshotMessage(message)) {
247 switchBehavior(reusableSwitchBehaviorSupplier.handleMessage(getSender(), message));
251 private void switchBehavior(SwitchBehavior message) {
252 if(!getRaftActorContext().getRaftPolicy().automaticElectionsEnabled()) {
253 RaftState newState = message.getNewState();
254 if( newState == RaftState.Leader || newState == RaftState.Follower) {
255 switchBehavior(reusableSwitchBehaviorSupplier.handleMessage(getSender(), message));
256 getRaftActorContext().getTermInformation().updateAndPersist(message.getNewTerm(), "");
258 LOG.warn("Switching to behavior : {} - not supported", newState);
263 private void switchBehavior(Supplier<RaftActorBehavior> supplier){
264 reusableBehaviorStateHolder.init(getCurrentBehavior());
266 setCurrentBehavior(supplier.get());
268 handleBehaviorChange(reusableBehaviorStateHolder, getCurrentBehavior());
271 protected RaftActorSnapshotMessageSupport newRaftActorSnapshotMessageSupport() {
272 return new RaftActorSnapshotMessageSupport(context, currentBehavior,
273 getRaftActorSnapshotCohort());
276 private void onGetOnDemandRaftStats() {
277 // Debugging message to retrieve raft stats.
279 OnDemandRaftState.Builder builder = OnDemandRaftState.builder()
280 .commitIndex(context.getCommitIndex())
281 .currentTerm(context.getTermInformation().getCurrentTerm())
282 .inMemoryJournalDataSize(replicatedLog().dataSize())
283 .inMemoryJournalLogSize(replicatedLog().size())
284 .isSnapshotCaptureInitiated(context.getSnapshotManager().isCapturing())
285 .lastApplied(context.getLastApplied())
286 .lastIndex(replicatedLog().lastIndex())
287 .lastTerm(replicatedLog().lastTerm())
288 .leader(getLeaderId())
289 .raftState(currentBehavior.state().toString())
290 .replicatedToAllIndex(currentBehavior.getReplicatedToAllIndex())
291 .snapshotIndex(replicatedLog().getSnapshotIndex())
292 .snapshotTerm(replicatedLog().getSnapshotTerm())
293 .votedFor(context.getTermInformation().getVotedFor())
294 .peerAddresses(new HashMap<>(context.getPeerAddresses()));
296 ReplicatedLogEntry lastLogEntry = getLastLogEntry();
297 if (lastLogEntry != null) {
298 builder.lastLogIndex(lastLogEntry.getIndex());
299 builder.lastLogTerm(lastLogEntry.getTerm());
302 if(getCurrentBehavior() instanceof AbstractLeader) {
303 AbstractLeader leader = (AbstractLeader)getCurrentBehavior();
304 Collection<String> followerIds = leader.getFollowerIds();
305 List<FollowerInfo> followerInfoList = Lists.newArrayListWithCapacity(followerIds.size());
306 for(String id: followerIds) {
307 final FollowerLogInformation info = leader.getFollower(id);
308 followerInfoList.add(new FollowerInfo(id, info.getNextIndex(), info.getMatchIndex(),
309 info.isFollowerActive(), DurationFormatUtils.formatDurationHMS(info.timeSinceLastActivity())));
312 builder.followerInfoList(followerInfoList);
315 sender().tell(builder.build(), self());
319 private void handleBehaviorChange(BehaviorStateHolder oldBehaviorState, RaftActorBehavior currentBehavior) {
320 RaftActorBehavior oldBehavior = oldBehaviorState.getBehavior();
322 if (oldBehavior != currentBehavior){
326 String oldBehaviorLeaderId = oldBehavior == null ? null : oldBehaviorState.getLeaderId();
327 String oldBehaviorStateName = oldBehavior == null ? null : oldBehavior.state().name();
329 // it can happen that the state has not changed but the leader has changed.
330 Optional<ActorRef> roleChangeNotifier = getRoleChangeNotifier();
331 if(!Objects.equal(oldBehaviorLeaderId, currentBehavior.getLeaderId()) ||
332 oldBehaviorState.getLeaderPayloadVersion() != currentBehavior.getLeaderPayloadVersion()) {
333 if(roleChangeNotifier.isPresent()) {
334 roleChangeNotifier.get().tell(newLeaderStateChanged(getId(), currentBehavior.getLeaderId(),
335 currentBehavior.getLeaderPayloadVersion()), getSelf());
338 onLeaderChanged(oldBehaviorLeaderId, currentBehavior.getLeaderId());
341 if (roleChangeNotifier.isPresent() &&
342 (oldBehavior == null || (oldBehavior.state() != currentBehavior.state()))) {
343 roleChangeNotifier.get().tell(new RoleChanged(getId(), oldBehaviorStateName ,
344 currentBehavior.state().name()), getSelf());
348 protected LeaderStateChanged newLeaderStateChanged(String memberId, String leaderId, short leaderPayloadVersion) {
349 return new LeaderStateChanged(memberId, leaderId, leaderPayloadVersion);
353 public long snapshotSequenceNr() {
354 // When we do a snapshot capture, we also capture and save the sequence-number of the persistent journal,
355 // so that we can delete the persistent journal based on the saved sequence-number
356 // However , when akka replays the journal during recovery, it replays it from the sequence number when the snapshot
357 // was saved and not the number we saved.
358 // We would want to override it , by asking akka to use the last-sequence number known to us.
359 return context.getSnapshotManager().getLastSequenceNumber();
363 * When a derived RaftActor needs to persist something it must call
370 protected void persistData(final ActorRef clientActor, final String identifier,
371 final Payload data) {
373 ReplicatedLogEntry replicatedLogEntry = new ReplicatedLogImplEntry(
374 context.getReplicatedLog().lastIndex() + 1,
375 context.getTermInformation().getCurrentTerm(), data);
377 if(LOG.isDebugEnabled()) {
378 LOG.debug("{}: Persist data {}", persistenceId(), replicatedLogEntry);
381 final RaftActorContext raftContext = getRaftActorContext();
383 replicatedLog().appendAndPersist(replicatedLogEntry, new Procedure<ReplicatedLogEntry>() {
385 public void apply(ReplicatedLogEntry replicatedLogEntry) throws Exception {
386 if (!hasFollowers()){
387 // Increment the Commit Index and the Last Applied values
388 raftContext.setCommitIndex(replicatedLogEntry.getIndex());
389 raftContext.setLastApplied(replicatedLogEntry.getIndex());
391 // Apply the state immediately.
392 self().tell(new ApplyState(clientActor, identifier, replicatedLogEntry), self());
394 // Send a ApplyJournalEntries message so that we write the fact that we applied
395 // the state to durable storage
396 self().tell(new ApplyJournalEntries(replicatedLogEntry.getIndex()), self());
398 } else if (clientActor != null) {
399 context.getReplicatedLog().captureSnapshotIfReady(replicatedLogEntry);
401 // Send message for replication
402 currentBehavior.handleMessage(getSelf(),
403 new Replicate(clientActor, identifier, replicatedLogEntry));
409 private ReplicatedLog replicatedLog() {
410 return context.getReplicatedLog();
413 protected String getId() {
414 return context.getId();
418 void setCurrentBehavior(RaftActorBehavior behavior) {
419 currentBehavior.setDelegate(behavior);
422 protected RaftActorBehavior getCurrentBehavior() {
423 return currentBehavior.getDelegate();
427 * Derived actors can call the isLeader method to check if the current
428 * RaftActor is the Leader or not
430 * @return true it this RaftActor is a Leader false otherwise
432 protected boolean isLeader() {
433 return context.getId().equals(currentBehavior.getLeaderId());
437 * Derived actor can call getLeader if they need a reference to the Leader.
438 * This would be useful for example in forwarding a request to an actor
439 * which is the leader
441 * @return A reference to the leader if known, null otherwise
443 protected ActorSelection getLeader(){
444 String leaderAddress = getLeaderAddress();
446 if(leaderAddress == null){
450 return context.actorSelection(leaderAddress);
455 * @return the current leader's id
457 protected String getLeaderId(){
458 return currentBehavior.getLeaderId();
461 protected RaftState getRaftState() {
462 return currentBehavior.state();
465 protected ReplicatedLogEntry getLastLogEntry() {
466 return replicatedLog().last();
469 protected Long getCurrentTerm(){
470 return context.getTermInformation().getCurrentTerm();
473 protected Long getCommitIndex(){
474 return context.getCommitIndex();
477 protected Long getLastApplied(){
478 return context.getLastApplied();
481 protected RaftActorContext getRaftActorContext() {
485 protected void updateConfigParams(ConfigParams configParams) {
486 context.setConfigParams(configParams);
489 public final DataPersistenceProvider persistence() {
490 return delegatingPersistenceProvider.getDelegate();
493 public void setPersistence(DataPersistenceProvider provider) {
494 delegatingPersistenceProvider.setDelegate(provider);
497 protected void setPersistence(boolean persistent) {
499 setPersistence(new PersistentDataProvider(this));
501 setPersistence(new NonPersistentDataProvider() {
503 * The way snapshotting works is,
505 * <li> RaftActor calls createSnapshot on the Shard
506 * <li> Shard sends a CaptureSnapshotReply and RaftActor then calls saveSnapshot
507 * <li> When saveSnapshot is invoked on the akka-persistence API it uses the SnapshotStore to save
508 * the snapshot. The SnapshotStore sends SaveSnapshotSuccess or SaveSnapshotFailure. When the
509 * RaftActor gets SaveSnapshot success it commits the snapshot to the in-memory journal. This
510 * commitSnapshot is mimicking what is done in SaveSnapshotSuccess.
514 public void saveSnapshot(Object o) {
515 // Make saving Snapshot successful
516 // Committing the snapshot here would end up calling commit in the creating state which would
517 // be a state violation. That's why now we send a message to commit the snapshot.
518 self().tell(RaftActorSnapshotMessageSupport.COMMIT_SNAPSHOT, self());
525 * setPeerAddress sets the address of a known peer at a later time.
527 * This is to account for situations where a we know that a peer
528 * exists but we do not know an address up-front. This may also be used in
529 * situations where a known peer starts off in a different location and we
530 * need to change it's address
532 * Note that if the peerId does not match the list of peers passed to
533 * this actor during construction an IllegalStateException will be thrown.
538 protected void setPeerAddress(String peerId, String peerAddress){
539 context.setPeerAddress(peerId, peerAddress);
543 * The applyState method will be called by the RaftActor when some data
544 * needs to be applied to the actor's state
546 * @param clientActor A reference to the client who sent this message. This
547 * is the same reference that was passed to persistData
548 * by the derived actor. clientActor may be null when
549 * the RaftActor is behaving as a follower or during
551 * @param identifier The identifier of the persisted data. This is also
552 * the same identifier that was passed to persistData by
553 * the derived actor. identifier may be null when
554 * the RaftActor is behaving as a follower or during
556 * @param data A piece of data that was persisted by the persistData call.
557 * This should NEVER be null.
559 protected abstract void applyState(ActorRef clientActor, String identifier,
563 * Returns the RaftActorRecoveryCohort to participate in persistence recovery.
566 protected abstract RaftActorRecoveryCohort getRaftActorRecoveryCohort();
569 * This method is called when recovery is complete.
571 protected abstract void onRecoveryComplete();
574 * Returns the RaftActorSnapshotCohort to participate in persistence recovery.
577 protected abstract RaftActorSnapshotCohort getRaftActorSnapshotCohort();
580 * This method will be called by the RaftActor when the state of the
581 * RaftActor changes. The derived actor can then use methods like
582 * isLeader or getLeader to do something useful
584 protected abstract void onStateChanged();
587 * Notifier Actor for this RaftActor to notify when a role change happens
588 * @return ActorRef - ActorRef of the notifier or Optional.absent if none.
590 protected abstract Optional<ActorRef> getRoleChangeNotifier();
592 protected void onLeaderChanged(String oldLeader, String newLeader){};
594 private String getLeaderAddress(){
596 return getSelf().path().toString();
598 String leaderId = currentBehavior.getLeaderId();
599 if (leaderId == null) {
602 String peerAddress = context.getPeerAddress(leaderId);
603 if(LOG.isDebugEnabled()) {
604 LOG.debug("{}: getLeaderAddress leaderId = {} peerAddress = {}",
605 persistenceId(), leaderId, peerAddress);
611 protected boolean hasFollowers(){
612 return getRaftActorContext().hasFollowers();
615 private void captureSnapshot() {
616 SnapshotManager snapshotManager = context.getSnapshotManager();
618 if(!snapshotManager.isCapturing()) {
619 LOG.debug("Take a snapshot of current state. lastReplicatedLog is {} and replicatedToAllIndex is {}",
620 replicatedLog().last(), currentBehavior.getReplicatedToAllIndex());
622 snapshotManager.capture(replicatedLog().last(), currentBehavior.getReplicatedToAllIndex());
627 * @deprecated Deprecated in favor of {@link org.opendaylight.controller.cluster.raft.base.messages.DeleteEntries}
628 * whose type for fromIndex is long instead of int. This class was kept for backwards
629 * compatibility with Helium.
631 // Suppressing this warning as we can't set serialVersionUID to maintain backwards compatibility.
632 @SuppressWarnings("serial")
634 static class DeleteEntries implements Serializable {
635 private final int fromIndex;
637 public DeleteEntries(int fromIndex) {
638 this.fromIndex = fromIndex;
641 public int getFromIndex() {
647 * @deprecated Deprecated in favor of non-inner class {@link org.opendaylight.controller.cluster.raft.base.messages.UpdateElectionTerm}
648 * which has serialVersionUID set. This class was kept for backwards compatibility with Helium.
650 // Suppressing this warning as we can't set serialVersionUID to maintain backwards compatibility.
651 @SuppressWarnings("serial")
653 static class UpdateElectionTerm implements Serializable {
654 private final long currentTerm;
655 private final String votedFor;
657 public UpdateElectionTerm(long currentTerm, String votedFor) {
658 this.currentTerm = currentTerm;
659 this.votedFor = votedFor;
662 public long getCurrentTerm() {
666 public String getVotedFor() {
671 private static class BehaviorStateHolder {
672 private RaftActorBehavior behavior;
673 private String leaderId;
674 private short leaderPayloadVersion;
676 void init(RaftActorBehavior behavior) {
677 this.behavior = behavior;
678 this.leaderId = behavior != null ? behavior.getLeaderId() : null;
679 this.leaderPayloadVersion = behavior != null ? behavior.getLeaderPayloadVersion() : -1;
682 RaftActorBehavior getBehavior() {
686 String getLeaderId() {
690 short getLeaderPayloadVersion() {
691 return leaderPayloadVersion;
695 private class SwitchBehaviorSupplier implements Supplier<RaftActorBehavior> {
696 private Object message;
697 private ActorRef sender;
699 public SwitchBehaviorSupplier handleMessage(ActorRef sender, Object message){
700 this.sender = sender;
701 this.message = message;
706 public RaftActorBehavior get() {
707 if(this.message instanceof SwitchBehavior){
708 return ((SwitchBehavior) message).getNewState().createBehavior(getRaftActorContext());
710 return currentBehavior.handleMessage(sender, message);