2 * Copyright (c) 2014 Cisco 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
9 package org.opendaylight.controller.cluster.datastore.shardmanager;
11 import static akka.pattern.Patterns.ask;
12 import akka.actor.ActorRef;
13 import akka.actor.Address;
14 import akka.actor.Cancellable;
15 import akka.actor.OneForOneStrategy;
16 import akka.actor.PoisonPill;
17 import akka.actor.Status;
18 import akka.actor.SupervisorStrategy;
19 import akka.actor.SupervisorStrategy.Directive;
20 import akka.cluster.ClusterEvent;
21 import akka.cluster.Member;
22 import akka.dispatch.Futures;
23 import akka.dispatch.OnComplete;
24 import akka.japi.Function;
25 import akka.pattern.Patterns;
26 import akka.persistence.RecoveryCompleted;
27 import akka.persistence.SaveSnapshotFailure;
28 import akka.persistence.SaveSnapshotSuccess;
29 import akka.persistence.SnapshotOffer;
30 import akka.persistence.SnapshotSelectionCriteria;
31 import akka.util.Timeout;
32 import com.google.common.annotations.VisibleForTesting;
33 import com.google.common.base.Preconditions;
34 import java.io.ByteArrayInputStream;
35 import java.io.ObjectInputStream;
36 import java.util.ArrayList;
37 import java.util.Collection;
38 import java.util.Collections;
39 import java.util.HashMap;
40 import java.util.HashSet;
41 import java.util.List;
43 import java.util.Map.Entry;
45 import java.util.concurrent.CountDownLatch;
46 import java.util.concurrent.TimeUnit;
47 import java.util.concurrent.TimeoutException;
48 import java.util.function.Consumer;
49 import java.util.function.Supplier;
50 import org.apache.commons.lang3.SerializationUtils;
51 import org.opendaylight.controller.cluster.access.concepts.MemberName;
52 import org.opendaylight.controller.cluster.common.actor.AbstractUntypedPersistentActorWithMetering;
53 import org.opendaylight.controller.cluster.datastore.ClusterWrapper;
54 import org.opendaylight.controller.cluster.datastore.DatastoreContext;
55 import org.opendaylight.controller.cluster.datastore.DatastoreContextFactory;
56 import org.opendaylight.controller.cluster.datastore.Shard;
57 import org.opendaylight.controller.cluster.datastore.config.Configuration;
58 import org.opendaylight.controller.cluster.datastore.config.ModuleShardConfiguration;
59 import org.opendaylight.controller.cluster.datastore.exceptions.AlreadyExistsException;
60 import org.opendaylight.controller.cluster.datastore.exceptions.NoShardLeaderException;
61 import org.opendaylight.controller.cluster.datastore.exceptions.NotInitializedException;
62 import org.opendaylight.controller.cluster.datastore.exceptions.PrimaryNotFoundException;
63 import org.opendaylight.controller.cluster.datastore.identifiers.ShardIdentifier;
64 import org.opendaylight.controller.cluster.datastore.messages.ActorInitialized;
65 import org.opendaylight.controller.cluster.datastore.messages.AddShardReplica;
66 import org.opendaylight.controller.cluster.datastore.messages.ChangeShardMembersVotingStatus;
67 import org.opendaylight.controller.cluster.datastore.messages.CreateShard;
68 import org.opendaylight.controller.cluster.datastore.messages.DatastoreSnapshot;
69 import org.opendaylight.controller.cluster.datastore.messages.FindLocalShard;
70 import org.opendaylight.controller.cluster.datastore.messages.FindPrimary;
71 import org.opendaylight.controller.cluster.datastore.messages.FlipShardMembersVotingStatus;
72 import org.opendaylight.controller.cluster.datastore.messages.LocalPrimaryShardFound;
73 import org.opendaylight.controller.cluster.datastore.messages.LocalShardFound;
74 import org.opendaylight.controller.cluster.datastore.messages.LocalShardNotFound;
75 import org.opendaylight.controller.cluster.datastore.messages.RemoteFindPrimary;
76 import org.opendaylight.controller.cluster.datastore.messages.RemotePrimaryShardFound;
77 import org.opendaylight.controller.cluster.datastore.messages.RemoveShardReplica;
78 import org.opendaylight.controller.cluster.datastore.messages.ShardLeaderStateChanged;
79 import org.opendaylight.controller.cluster.datastore.messages.UpdateSchemaContext;
80 import org.opendaylight.controller.cluster.datastore.utils.Dispatchers;
81 import org.opendaylight.controller.cluster.datastore.utils.PrimaryShardInfoFutureCache;
82 import org.opendaylight.controller.cluster.notifications.RegisterRoleChangeListener;
83 import org.opendaylight.controller.cluster.notifications.RoleChangeNotification;
84 import org.opendaylight.controller.cluster.raft.base.messages.FollowerInitialSyncUpStatus;
85 import org.opendaylight.controller.cluster.raft.base.messages.SwitchBehavior;
86 import org.opendaylight.controller.cluster.raft.client.messages.GetOnDemandRaftState;
87 import org.opendaylight.controller.cluster.raft.client.messages.GetSnapshot;
88 import org.opendaylight.controller.cluster.raft.client.messages.OnDemandRaftState;
89 import org.opendaylight.controller.cluster.raft.client.messages.Shutdown;
90 import org.opendaylight.controller.cluster.raft.messages.AddServer;
91 import org.opendaylight.controller.cluster.raft.messages.AddServerReply;
92 import org.opendaylight.controller.cluster.raft.messages.ChangeServersVotingStatus;
93 import org.opendaylight.controller.cluster.raft.messages.RemoveServer;
94 import org.opendaylight.controller.cluster.raft.messages.RemoveServerReply;
95 import org.opendaylight.controller.cluster.raft.messages.ServerChangeReply;
96 import org.opendaylight.controller.cluster.raft.messages.ServerChangeStatus;
97 import org.opendaylight.controller.cluster.raft.messages.ServerRemoved;
98 import org.opendaylight.controller.cluster.raft.policy.DisableElectionsRaftPolicy;
99 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
100 import org.slf4j.Logger;
101 import org.slf4j.LoggerFactory;
102 import scala.concurrent.ExecutionContext;
103 import scala.concurrent.Future;
104 import scala.concurrent.duration.Duration;
105 import scala.concurrent.duration.FiniteDuration;
108 * The ShardManager has the following jobs,
110 * <li> Create all the local shard replicas that belong on this cluster member
111 * <li> Find the address of the local shard
112 * <li> Find the primary replica for any given shard
113 * <li> Monitor the cluster members and store their addresses
116 class ShardManager extends AbstractUntypedPersistentActorWithMetering {
118 private static final Logger LOG = LoggerFactory.getLogger(ShardManager.class);
120 // Stores a mapping between a shard name and it's corresponding information
121 // Shard names look like inventory, topology etc and are as specified in
123 private final Map<String, ShardInformation> localShards = new HashMap<>();
125 // The type of a ShardManager reflects the type of the datastore itself
126 // A data store could be of type config/operational
127 private final String type;
129 private final ClusterWrapper cluster;
131 private final Configuration configuration;
133 private final String shardDispatcherPath;
135 private final ShardManagerInfo mBean;
137 private DatastoreContextFactory datastoreContextFactory;
139 private final CountDownLatch waitTillReadyCountdownLatch;
141 private final PrimaryShardInfoFutureCache primaryShardInfoCache;
143 private final ShardPeerAddressResolver peerAddressResolver;
145 private SchemaContext schemaContext;
147 private DatastoreSnapshot restoreFromSnapshot;
149 private ShardManagerSnapshot currentSnapshot;
151 private final Set<String> shardReplicaOperationsInProgress = new HashSet<>();
153 private final String persistenceId;
155 ShardManager(AbstractShardManagerCreator<?> builder) {
156 this.cluster = builder.getCluster();
157 this.configuration = builder.getConfiguration();
158 this.datastoreContextFactory = builder.getDatastoreContextFactory();
159 this.type = datastoreContextFactory.getBaseDatastoreContext().getDataStoreName();
160 this.shardDispatcherPath =
161 new Dispatchers(context().system().dispatchers()).getDispatcherPath(Dispatchers.DispatcherType.Shard);
162 this.waitTillReadyCountdownLatch = builder.getWaitTillReadyCountdownLatch();
163 this.primaryShardInfoCache = builder.getPrimaryShardInfoCache();
164 this.restoreFromSnapshot = builder.getRestoreFromSnapshot();
166 String possiblePersistenceId = datastoreContextFactory.getBaseDatastoreContext().getShardManagerPersistenceId();
167 persistenceId = possiblePersistenceId != null ? possiblePersistenceId : "shard-manager-" + type;
169 peerAddressResolver = new ShardPeerAddressResolver(type, cluster.getCurrentMemberName());
171 // Subscribe this actor to cluster member events
172 cluster.subscribeToMemberEvents(getSelf());
174 mBean = new ShardManagerInfo(getSelf(), cluster.getCurrentMemberName(), "shard-manager-" + this.type,
175 datastoreContextFactory.getBaseDatastoreContext().getDataStoreMXBeanType());
176 mBean.registerMBean();
180 public void postStop() {
181 LOG.info("Stopping ShardManager {}", persistenceId());
183 mBean.unregisterMBean();
187 public void handleCommand(Object message) throws Exception {
188 if (message instanceof FindPrimary) {
189 findPrimary((FindPrimary)message);
190 } else if(message instanceof FindLocalShard){
191 findLocalShard((FindLocalShard) message);
192 } else if (message instanceof UpdateSchemaContext) {
193 updateSchemaContext(message);
194 } else if(message instanceof ActorInitialized) {
195 onActorInitialized(message);
196 } else if (message instanceof ClusterEvent.MemberUp){
197 memberUp((ClusterEvent.MemberUp) message);
198 } else if (message instanceof ClusterEvent.MemberExited){
199 memberExited((ClusterEvent.MemberExited) message);
200 } else if(message instanceof ClusterEvent.MemberRemoved) {
201 memberRemoved((ClusterEvent.MemberRemoved) message);
202 } else if(message instanceof ClusterEvent.UnreachableMember) {
203 memberUnreachable((ClusterEvent.UnreachableMember)message);
204 } else if(message instanceof ClusterEvent.ReachableMember) {
205 memberReachable((ClusterEvent.ReachableMember) message);
206 } else if(message instanceof DatastoreContextFactory) {
207 onDatastoreContextFactory((DatastoreContextFactory)message);
208 } else if(message instanceof RoleChangeNotification) {
209 onRoleChangeNotification((RoleChangeNotification) message);
210 } else if(message instanceof FollowerInitialSyncUpStatus){
211 onFollowerInitialSyncStatus((FollowerInitialSyncUpStatus) message);
212 } else if(message instanceof ShardNotInitializedTimeout) {
213 onShardNotInitializedTimeout((ShardNotInitializedTimeout)message);
214 } else if(message instanceof ShardLeaderStateChanged) {
215 onLeaderStateChanged((ShardLeaderStateChanged) message);
216 } else if(message instanceof SwitchShardBehavior){
217 onSwitchShardBehavior((SwitchShardBehavior) message);
218 } else if(message instanceof CreateShard) {
219 onCreateShard((CreateShard)message);
220 } else if(message instanceof AddShardReplica){
221 onAddShardReplica((AddShardReplica)message);
222 } else if(message instanceof ForwardedAddServerReply) {
223 ForwardedAddServerReply msg = (ForwardedAddServerReply)message;
224 onAddServerReply(msg.shardInfo, msg.addServerReply, getSender(), msg.leaderPath,
225 msg.removeShardOnFailure);
226 } else if(message instanceof ForwardedAddServerFailure) {
227 ForwardedAddServerFailure msg = (ForwardedAddServerFailure)message;
228 onAddServerFailure(msg.shardName, msg.failureMessage, msg.failure, getSender(), msg.removeShardOnFailure);
229 } else if(message instanceof RemoveShardReplica) {
230 onRemoveShardReplica((RemoveShardReplica) message);
231 } else if(message instanceof WrappedShardResponse){
232 onWrappedShardResponse((WrappedShardResponse) message);
233 } else if(message instanceof GetSnapshot) {
235 } else if(message instanceof ServerRemoved){
236 onShardReplicaRemoved((ServerRemoved) message);
237 } else if(message instanceof ChangeShardMembersVotingStatus){
238 onChangeShardServersVotingStatus((ChangeShardMembersVotingStatus) message);
239 } else if(message instanceof FlipShardMembersVotingStatus){
240 onFlipShardMembersVotingStatus((FlipShardMembersVotingStatus) message);
241 } else if(message instanceof SaveSnapshotSuccess) {
242 onSaveSnapshotSuccess((SaveSnapshotSuccess)message);
243 } else if(message instanceof SaveSnapshotFailure) {
244 LOG.error("{}: SaveSnapshotFailure received for saving snapshot of shards",
245 persistenceId(), ((SaveSnapshotFailure) message).cause());
246 } else if(message instanceof Shutdown) {
248 } else if (message instanceof GetLocalShardIds) {
249 onGetLocalShardIds();
250 } else if(message instanceof RunnableMessage) {
251 ((RunnableMessage)message).run();
253 unknownMessage(message);
257 private void onShutDown() {
258 List<Future<Boolean>> stopFutures = new ArrayList<>(localShards.size());
259 for (ShardInformation info : localShards.values()) {
260 if (info.getActor() != null) {
261 LOG.debug("{}: Issuing gracefulStop to shard {}", persistenceId(), info.getShardId());
263 FiniteDuration duration = info.getDatastoreContext().getShardRaftConfig().getElectionTimeOutInterval().$times(2);
264 stopFutures.add(Patterns.gracefulStop(info.getActor(), duration, Shutdown.INSTANCE));
268 LOG.info("Shutting down ShardManager {} - waiting on {} shards", persistenceId(), stopFutures.size());
270 ExecutionContext dispatcher = new Dispatchers(context().system().dispatchers()).getDispatcher(Dispatchers.DispatcherType.Client);
271 Future<Iterable<Boolean>> combinedFutures = Futures.sequence(stopFutures, dispatcher);
273 combinedFutures.onComplete(new OnComplete<Iterable<Boolean>>() {
275 public void onComplete(Throwable failure, Iterable<Boolean> results) {
276 LOG.debug("{}: All shards shutdown - sending PoisonPill to self", persistenceId());
278 self().tell(PoisonPill.getInstance(), self());
280 if(failure != null) {
281 LOG.warn("{}: An error occurred attempting to shut down the shards", persistenceId(), failure);
284 for(Boolean r: results) {
291 LOG.warn("{}: {} shards did not shut down gracefully", persistenceId(), nfailed);
298 private void onWrappedShardResponse(WrappedShardResponse message) {
299 if (message.getResponse() instanceof RemoveServerReply) {
300 onRemoveServerReply(getSender(), message.getShardId(), (RemoveServerReply) message.getResponse(),
301 message.getLeaderPath());
305 private void onRemoveServerReply(ActorRef originalSender, ShardIdentifier shardId, RemoveServerReply replyMsg,
307 shardReplicaOperationsInProgress.remove(shardId);
309 LOG.debug ("{}: Received {} for shard {}", persistenceId(), replyMsg, shardId.getShardName());
311 if (replyMsg.getStatus() == ServerChangeStatus.OK) {
312 LOG.debug ("{}: Leader shard successfully removed the replica shard {}", persistenceId(),
313 shardId.getShardName());
314 originalSender.tell(new Status.Success(null), getSelf());
316 LOG.warn ("{}: Leader failed to remove shard replica {} with status {}",
317 persistenceId(), shardId, replyMsg.getStatus());
319 Exception failure = getServerChangeException(RemoveServer.class, replyMsg.getStatus(), leaderPath, shardId);
320 originalSender.tell(new Status.Failure(failure), getSelf());
324 private void removeShardReplica(RemoveShardReplica contextMessage, final String shardName, final String primaryPath,
325 final ActorRef sender) {
326 if(isShardReplicaOperationInProgress(shardName, sender)) {
330 shardReplicaOperationsInProgress.add(shardName);
332 final ShardIdentifier shardId = getShardIdentifier(contextMessage.getMemberName(), shardName);
334 final DatastoreContext datastoreContext = newShardDatastoreContextBuilder(shardName).build();
336 //inform ShardLeader to remove this shard as a replica by sending an RemoveServer message
337 LOG.debug ("{}: Sending RemoveServer message to peer {} for shard {}", persistenceId(),
338 primaryPath, shardId);
340 Timeout removeServerTimeout = new Timeout(datastoreContext.getShardLeaderElectionTimeout().
342 Future<Object> futureObj = ask(getContext().actorSelection(primaryPath),
343 new RemoveServer(shardId.toString()), removeServerTimeout);
345 futureObj.onComplete(new OnComplete<Object>() {
347 public void onComplete(Throwable failure, Object response) {
348 if (failure != null) {
349 shardReplicaOperationsInProgress.remove(shardName);
350 String msg = String.format("RemoveServer request to leader %s for shard %s failed",
351 primaryPath, shardName);
353 LOG.debug ("{}: {}", persistenceId(), msg, failure);
356 sender.tell(new Status.Failure(new RuntimeException(msg, failure)), self());
359 self().tell(new WrappedShardResponse(shardId, response, primaryPath), sender);
362 }, new Dispatchers(context().system().dispatchers()).getDispatcher(Dispatchers.DispatcherType.Client));
365 private void onShardReplicaRemoved(ServerRemoved message) {
366 final ShardIdentifier shardId = new ShardIdentifier.Builder().fromShardIdString(message.getServerId()).build();
367 final ShardInformation shardInformation = localShards.remove(shardId.getShardName());
368 if(shardInformation == null) {
369 LOG.debug("{} : Shard replica {} is not present in list", persistenceId(), shardId.toString());
371 } else if(shardInformation.getActor() != null) {
372 LOG.debug("{} : Sending Shutdown to Shard actor {}", persistenceId(), shardInformation.getActor());
373 shardInformation.getActor().tell(Shutdown.INSTANCE, self());
375 LOG.debug("{} : Local Shard replica for shard {} has been removed", persistenceId(), shardId.getShardName());
379 private void onGetSnapshot() {
380 LOG.debug("{}: onGetSnapshot", persistenceId());
382 List<String> notInitialized = null;
383 for(ShardInformation shardInfo: localShards.values()) {
384 if(!shardInfo.isShardInitialized()) {
385 if(notInitialized == null) {
386 notInitialized = new ArrayList<>();
389 notInitialized.add(shardInfo.getShardName());
393 if(notInitialized != null) {
394 getSender().tell(new Status.Failure(new IllegalStateException(String.format(
395 "%d shard(s) %s are not initialized", notInitialized.size(), notInitialized))), getSelf());
399 byte[] shardManagerSnapshot = null;
400 if(currentSnapshot != null) {
401 shardManagerSnapshot = SerializationUtils.serialize(currentSnapshot);
404 ActorRef replyActor = getContext().actorOf(ShardManagerGetSnapshotReplyActor.props(
405 new ArrayList<>(localShards.keySet()), type, shardManagerSnapshot , getSender(), persistenceId(),
406 datastoreContextFactory.getBaseDatastoreContext().getShardInitializationTimeout().duration()));
408 for(ShardInformation shardInfo: localShards.values()) {
409 shardInfo.getActor().tell(GetSnapshot.INSTANCE, replyActor);
413 private void onCreateShard(CreateShard createShard) {
414 LOG.debug("{}: onCreateShard: {}", persistenceId(), createShard);
418 String shardName = createShard.getModuleShardConfig().getShardName();
419 if(localShards.containsKey(shardName)) {
420 LOG.debug("{}: Shard {} already exists", persistenceId(), shardName);
421 reply = new Status.Success(String.format("Shard with name %s already exists", shardName));
423 doCreateShard(createShard);
424 reply = new Status.Success(null);
426 } catch (Exception e) {
427 LOG.error("{}: onCreateShard failed", persistenceId(), e);
428 reply = new Status.Failure(e);
431 if(getSender() != null && !getContext().system().deadLetters().equals(getSender())) {
432 getSender().tell(reply, getSelf());
436 private void doCreateShard(CreateShard createShard) {
437 ModuleShardConfiguration moduleShardConfig = createShard.getModuleShardConfig();
438 String shardName = moduleShardConfig.getShardName();
440 configuration.addModuleShardConfiguration(moduleShardConfig);
442 DatastoreContext shardDatastoreContext = createShard.getDatastoreContext();
443 if(shardDatastoreContext == null) {
444 shardDatastoreContext = newShardDatastoreContext(shardName);
446 shardDatastoreContext = DatastoreContext.newBuilderFrom(shardDatastoreContext).shardPeerAddressResolver(
447 peerAddressResolver).build();
450 ShardIdentifier shardId = getShardIdentifier(cluster.getCurrentMemberName(), shardName);
452 boolean shardWasInRecoveredSnapshot = currentSnapshot != null &&
453 currentSnapshot.getShardList().contains(shardName);
455 Map<String, String> peerAddresses;
456 boolean isActiveMember;
457 if(shardWasInRecoveredSnapshot || configuration.getMembersFromShardName(shardName).
458 contains(cluster.getCurrentMemberName())) {
459 peerAddresses = getPeerAddresses(shardName);
460 isActiveMember = true;
462 // The local member is not in the static shard member configuration and the shard did not
463 // previously exist (ie !shardWasInRecoveredSnapshot). In this case we'll create
464 // the shard with no peers and with elections disabled so it stays as follower. A
465 // subsequent AddServer request will be needed to make it an active member.
466 isActiveMember = false;
467 peerAddresses = Collections.emptyMap();
468 shardDatastoreContext = DatastoreContext.newBuilderFrom(shardDatastoreContext).
469 customRaftPolicyImplementation(DisableElectionsRaftPolicy.class.getName()).build();
472 LOG.debug("{} doCreateShard: shardId: {}, memberNames: {}, peerAddresses: {}, isActiveMember: {}",
473 persistenceId(), shardId, moduleShardConfig.getShardMemberNames(), peerAddresses,
476 ShardInformation info = new ShardInformation(shardName, shardId, peerAddresses,
477 shardDatastoreContext, createShard.getShardBuilder(), peerAddressResolver);
478 info.setActiveMember(isActiveMember);
479 localShards.put(info.getShardName(), info);
481 if(schemaContext != null) {
482 info.setActor(newShardActor(schemaContext, info));
486 private DatastoreContext.Builder newShardDatastoreContextBuilder(String shardName) {
487 return DatastoreContext.newBuilderFrom(datastoreContextFactory.getShardDatastoreContext(shardName)).
488 shardPeerAddressResolver(peerAddressResolver);
491 private DatastoreContext newShardDatastoreContext(String shardName) {
492 return newShardDatastoreContextBuilder(shardName).build();
495 private void checkReady(){
496 if (isReadyWithLeaderId()) {
497 LOG.info("{}: All Shards are ready - data store {} is ready, available count is {}",
498 persistenceId(), type, waitTillReadyCountdownLatch.getCount());
500 waitTillReadyCountdownLatch.countDown();
504 private void onLeaderStateChanged(ShardLeaderStateChanged leaderStateChanged) {
505 LOG.info("{}: Received LeaderStateChanged message: {}", persistenceId(), leaderStateChanged);
507 ShardInformation shardInformation = findShardInformation(leaderStateChanged.getMemberId());
508 if(shardInformation != null) {
509 shardInformation.setLocalDataTree(leaderStateChanged.getLocalShardDataTree());
510 shardInformation.setLeaderVersion(leaderStateChanged.getLeaderPayloadVersion());
511 if(shardInformation.setLeaderId(leaderStateChanged.getLeaderId())) {
512 primaryShardInfoCache.remove(shardInformation.getShardName());
517 LOG.debug("No shard found with member Id {}", leaderStateChanged.getMemberId());
521 private void onShardNotInitializedTimeout(ShardNotInitializedTimeout message) {
522 ShardInformation shardInfo = message.getShardInfo();
524 LOG.debug("{}: Received ShardNotInitializedTimeout message for shard {}", persistenceId(),
525 shardInfo.getShardName());
527 shardInfo.removeOnShardInitialized(message.getOnShardInitialized());
529 if(!shardInfo.isShardInitialized()) {
530 LOG.debug("{}: Returning NotInitializedException for shard {}", persistenceId(), shardInfo.getShardName());
531 message.getSender().tell(createNotInitializedException(shardInfo.getShardId()), getSelf());
533 LOG.debug("{}: Returning NoShardLeaderException for shard {}", persistenceId(), shardInfo.getShardName());
534 message.getSender().tell(createNoShardLeaderException(shardInfo.getShardId()), getSelf());
538 private void onFollowerInitialSyncStatus(FollowerInitialSyncUpStatus status) {
539 LOG.info("{} Received follower initial sync status for {} status sync done {}", persistenceId(),
540 status.getName(), status.isInitialSyncDone());
542 ShardInformation shardInformation = findShardInformation(status.getName());
544 if(shardInformation != null) {
545 shardInformation.setFollowerSyncStatus(status.isInitialSyncDone());
547 mBean.setSyncStatus(isInSync());
552 private void onRoleChangeNotification(RoleChangeNotification roleChanged) {
553 LOG.info("{}: Received role changed for {} from {} to {}", persistenceId(), roleChanged.getMemberId(),
554 roleChanged.getOldRole(), roleChanged.getNewRole());
556 ShardInformation shardInformation = findShardInformation(roleChanged.getMemberId());
557 if(shardInformation != null) {
558 shardInformation.setRole(roleChanged.getNewRole());
560 mBean.setSyncStatus(isInSync());
565 private ShardInformation findShardInformation(String memberId) {
566 for(ShardInformation info : localShards.values()){
567 if(info.getShardId().toString().equals(memberId)){
575 private boolean isReadyWithLeaderId() {
576 boolean isReady = true;
577 for (ShardInformation info : localShards.values()) {
578 if(!info.isShardReadyWithLeaderId()){
586 private boolean isInSync(){
587 for (ShardInformation info : localShards.values()) {
588 if(!info.isInSync()){
595 private void onActorInitialized(Object message) {
596 final ActorRef sender = getSender();
598 if (sender == null) {
599 return; //why is a non-actor sending this message? Just ignore.
602 String actorName = sender.path().name();
603 //find shard name from actor name; actor name is stringified shardId
605 final ShardIdentifier shardId;
607 shardId = ShardIdentifier.fromShardIdString(actorName);
608 } catch (IllegalArgumentException e) {
609 LOG.debug("{}: ignoring actor {}", actorName, e);
613 markShardAsInitialized(shardId.getShardName());
616 private void markShardAsInitialized(String shardName) {
617 LOG.debug("{}: Initializing shard [{}]", persistenceId(), shardName);
619 ShardInformation shardInformation = localShards.get(shardName);
620 if (shardInformation != null) {
621 shardInformation.setActorInitialized();
623 shardInformation.getActor().tell(new RegisterRoleChangeListener(), self());
628 protected void handleRecover(Object message) throws Exception {
629 if (message instanceof RecoveryCompleted) {
630 onRecoveryCompleted();
631 } else if (message instanceof SnapshotOffer) {
632 applyShardManagerSnapshot((ShardManagerSnapshot)((SnapshotOffer) message).snapshot());
636 private void onRecoveryCompleted() {
637 LOG.info("Recovery complete : {}", persistenceId());
639 // We no longer persist SchemaContext modules so delete all the prior messages from the akka
640 // journal on upgrade from Helium.
641 deleteMessages(lastSequenceNr());
643 if(currentSnapshot == null && restoreFromSnapshot != null &&
644 restoreFromSnapshot.getShardManagerSnapshot() != null) {
645 try(ObjectInputStream ois = new ObjectInputStream(new ByteArrayInputStream(
646 restoreFromSnapshot.getShardManagerSnapshot()))) {
647 ShardManagerSnapshot snapshot = (ShardManagerSnapshot) ois.readObject();
649 LOG.debug("{}: Deserialized restored ShardManagerSnapshot: {}", persistenceId(), snapshot);
651 applyShardManagerSnapshot(snapshot);
652 } catch(Exception e) {
653 LOG.error("{}: Error deserializing restored ShardManagerSnapshot", persistenceId(), e);
660 private void findLocalShard(FindLocalShard message) {
661 final ShardInformation shardInformation = localShards.get(message.getShardName());
663 if(shardInformation == null){
664 getSender().tell(new LocalShardNotFound(message.getShardName()), getSelf());
668 sendResponse(shardInformation, message.isWaitUntilInitialized(), false, () -> new LocalShardFound(shardInformation.getActor()));
671 private void sendResponse(ShardInformation shardInformation, boolean doWait,
672 boolean wantShardReady, final Supplier<Object> messageSupplier) {
673 if (!shardInformation.isShardInitialized() || (wantShardReady && !shardInformation.isShardReadyWithLeaderId())) {
675 final ActorRef sender = getSender();
676 final ActorRef self = self();
678 Runnable replyRunnable = () -> sender.tell(messageSupplier.get(), self);
680 OnShardInitialized onShardInitialized = wantShardReady ? new OnShardReady(replyRunnable) :
681 new OnShardInitialized(replyRunnable);
683 shardInformation.addOnShardInitialized(onShardInitialized);
685 FiniteDuration timeout = shardInformation.getDatastoreContext().getShardInitializationTimeout().duration();
686 if(shardInformation.isShardInitialized()) {
687 // If the shard is already initialized then we'll wait enough time for the shard to
688 // elect a leader, ie 2 times the election timeout.
689 timeout = FiniteDuration.create(shardInformation.getDatastoreContext().getShardRaftConfig()
690 .getElectionTimeOutInterval().toMillis() * 2, TimeUnit.MILLISECONDS);
693 LOG.debug("{}: Scheduling {} ms timer to wait for shard {}", persistenceId(), timeout.toMillis(),
694 shardInformation.getShardName());
696 Cancellable timeoutSchedule = getContext().system().scheduler().scheduleOnce(
698 new ShardNotInitializedTimeout(shardInformation, onShardInitialized, sender),
699 getContext().dispatcher(), getSelf());
701 onShardInitialized.setTimeoutSchedule(timeoutSchedule);
703 } else if (!shardInformation.isShardInitialized()) {
704 LOG.debug("{}: Returning NotInitializedException for shard {}", persistenceId(),
705 shardInformation.getShardName());
706 getSender().tell(createNotInitializedException(shardInformation.getShardId()), getSelf());
708 LOG.debug("{}: Returning NoShardLeaderException for shard {}", persistenceId(),
709 shardInformation.getShardName());
710 getSender().tell(createNoShardLeaderException(shardInformation.getShardId()), getSelf());
716 getSender().tell(messageSupplier.get(), getSelf());
719 private static NoShardLeaderException createNoShardLeaderException(ShardIdentifier shardId) {
720 return new NoShardLeaderException(null, shardId.toString());
723 private static NotInitializedException createNotInitializedException(ShardIdentifier shardId) {
724 return new NotInitializedException(String.format(
725 "Found primary shard %s but it's not initialized yet. Please try again later", shardId));
729 static MemberName memberToName(final Member member) {
730 return MemberName.forName(member.roles().iterator().next());
733 private void memberRemoved(ClusterEvent.MemberRemoved message) {
734 MemberName memberName = memberToName(message.member());
736 LOG.debug("{}: Received MemberRemoved: memberName: {}, address: {}", persistenceId(), memberName,
737 message.member().address());
739 peerAddressResolver.removePeerAddress(memberName);
741 for(ShardInformation info : localShards.values()){
742 info.peerDown(memberName, getShardIdentifier(memberName, info.getShardName()).toString(), getSelf());
746 private void memberExited(ClusterEvent.MemberExited message) {
747 MemberName memberName = memberToName(message.member());
749 LOG.debug("{}: Received MemberExited: memberName: {}, address: {}", persistenceId(), memberName,
750 message.member().address());
752 peerAddressResolver.removePeerAddress(memberName);
754 for(ShardInformation info : localShards.values()){
755 info.peerDown(memberName, getShardIdentifier(memberName, info.getShardName()).toString(), getSelf());
759 private void memberUp(ClusterEvent.MemberUp message) {
760 MemberName memberName = memberToName(message.member());
762 LOG.debug("{}: Received MemberUp: memberName: {}, address: {}", persistenceId(), memberName,
763 message.member().address());
765 addPeerAddress(memberName, message.member().address());
770 private void addPeerAddress(MemberName memberName, Address address) {
771 peerAddressResolver.addPeerAddress(memberName, address);
773 for(ShardInformation info : localShards.values()){
774 String shardName = info.getShardName();
775 String peerId = getShardIdentifier(memberName, shardName).toString();
776 info.updatePeerAddress(peerId, peerAddressResolver.getShardActorAddress(shardName, memberName), getSelf());
778 info.peerUp(memberName, peerId, getSelf());
782 private void memberReachable(ClusterEvent.ReachableMember message) {
783 MemberName memberName = memberToName(message.member());
784 LOG.debug("Received ReachableMember: memberName {}, address: {}", memberName, message.member().address());
786 addPeerAddress(memberName, message.member().address());
788 markMemberAvailable(memberName);
791 private void memberUnreachable(ClusterEvent.UnreachableMember message) {
792 MemberName memberName = memberToName(message.member());
793 LOG.debug("Received UnreachableMember: memberName {}, address: {}", memberName, message.member().address());
795 markMemberUnavailable(memberName);
798 private void markMemberUnavailable(final MemberName memberName) {
799 final String memberStr = memberName.getName();
800 for (ShardInformation info : localShards.values()) {
801 String leaderId = info.getLeaderId();
802 // XXX: why are we using String#contains() here?
803 if (leaderId != null && leaderId.contains(memberStr)) {
804 LOG.debug("Marking Leader {} as unavailable.", leaderId);
805 info.setLeaderAvailable(false);
807 primaryShardInfoCache.remove(info.getShardName());
810 info.peerDown(memberName, getShardIdentifier(memberName, info.getShardName()).toString(), getSelf());
814 private void markMemberAvailable(final MemberName memberName) {
815 final String memberStr = memberName.getName();
816 for (ShardInformation info : localShards.values()) {
817 String leaderId = info.getLeaderId();
818 // XXX: why are we using String#contains() here?
819 if (leaderId != null && leaderId.contains(memberStr)) {
820 LOG.debug("Marking Leader {} as available.", leaderId);
821 info.setLeaderAvailable(true);
824 info.peerUp(memberName, getShardIdentifier(memberName, info.getShardName()).toString(), getSelf());
828 private void onDatastoreContextFactory(DatastoreContextFactory factory) {
829 datastoreContextFactory = factory;
830 for (ShardInformation info : localShards.values()) {
831 info.setDatastoreContext(newShardDatastoreContext(info.getShardName()), getSelf());
835 private void onGetLocalShardIds() {
836 final List<String> response = new ArrayList<>(localShards.size());
838 for (ShardInformation info : localShards.values()) {
839 response.add(info.getShardId().toString());
842 getSender().tell(new Status.Success(response), getSelf());
845 private void onSwitchShardBehavior(final SwitchShardBehavior message) {
846 final ShardIdentifier identifier = message.getShardId();
848 if (identifier != null) {
849 final ShardInformation info = localShards.get(identifier.getShardName());
851 getSender().tell(new Status.Failure(
852 new IllegalArgumentException("Shard " + identifier + " is not local")), getSelf());
856 switchShardBehavior(info, new SwitchBehavior(message.getNewState(), message.getTerm()));
858 for (ShardInformation info : localShards.values()) {
859 switchShardBehavior(info, new SwitchBehavior(message.getNewState(), message.getTerm()));
863 getSender().tell(new Status.Success(null), getSelf());
866 private void switchShardBehavior(final ShardInformation info, final SwitchBehavior switchBehavior) {
867 final ActorRef actor = info.getActor();
869 actor.tell(switchBehavior, getSelf());
871 LOG.warn("Could not switch the behavior of shard {} to {} - shard is not yet available",
872 info.getShardName(), switchBehavior.getNewState());
877 * Notifies all the local shards of a change in the schema context
881 private void updateSchemaContext(final Object message) {
882 schemaContext = ((UpdateSchemaContext) message).getSchemaContext();
884 LOG.debug("Got updated SchemaContext: # of modules {}", schemaContext.getAllModuleIdentifiers().size());
886 for (ShardInformation info : localShards.values()) {
887 if (info.getActor() == null) {
888 LOG.debug("Creating Shard {}", info.getShardId());
889 info.setActor(newShardActor(schemaContext, info));
891 info.getActor().tell(message, getSelf());
897 protected ClusterWrapper getCluster() {
902 protected ActorRef newShardActor(final SchemaContext schemaContext, ShardInformation info) {
903 return getContext().actorOf(info.newProps(schemaContext)
904 .withDispatcher(shardDispatcherPath), info.getShardId().toString());
907 private void findPrimary(FindPrimary message) {
908 LOG.debug("{}: In findPrimary: {}", persistenceId(), message);
910 final String shardName = message.getShardName();
911 final boolean canReturnLocalShardState = !(message instanceof RemoteFindPrimary);
913 // First see if the there is a local replica for the shard
914 final ShardInformation info = localShards.get(shardName);
915 if (info != null && info.isActiveMember()) {
916 sendResponse(info, message.isWaitUntilReady(), true, () -> {
917 String primaryPath = info.getSerializedLeaderActor();
918 Object found = canReturnLocalShardState && info.isLeader() ?
919 new LocalPrimaryShardFound(primaryPath, info.getLocalShardDataTree().get()) :
920 new RemotePrimaryShardFound(primaryPath, info.getLeaderVersion());
922 if(LOG.isDebugEnabled()) {
923 LOG.debug("{}: Found primary for {}: {}", persistenceId(), shardName, found);
932 final Collection<String> visitedAddresses;
933 if(message instanceof RemoteFindPrimary) {
934 visitedAddresses = ((RemoteFindPrimary)message).getVisitedAddresses();
936 visitedAddresses = new ArrayList<>(1);
939 visitedAddresses.add(peerAddressResolver.getShardManagerActorPathBuilder(cluster.getSelfAddress()).toString());
941 for(String address: peerAddressResolver.getShardManagerPeerActorAddresses()) {
942 if(visitedAddresses.contains(address)) {
946 LOG.debug("{}: findPrimary for {} forwarding to remote ShardManager {}, visitedAddresses: {}",
947 persistenceId(), shardName, address, visitedAddresses);
949 getContext().actorSelection(address).forward(new RemoteFindPrimary(shardName,
950 message.isWaitUntilReady(), visitedAddresses), getContext());
954 LOG.debug("{}: No shard found for {}", persistenceId(), shardName);
956 getSender().tell(new PrimaryNotFoundException(
957 String.format("No primary shard found for %s.", shardName)), getSelf());
961 * Construct the name of the shard actor given the name of the member on
962 * which the shard resides and the name of the shard
968 private ShardIdentifier getShardIdentifier(MemberName memberName, String shardName){
969 return peerAddressResolver.getShardIdentifier(memberName, shardName);
973 * Create shards that are local to the member on which the ShardManager
977 private void createLocalShards() {
978 MemberName memberName = this.cluster.getCurrentMemberName();
979 Collection<String> memberShardNames = this.configuration.getMemberShardNames(memberName);
981 Map<String, DatastoreSnapshot.ShardSnapshot> shardSnapshots = new HashMap<>();
982 if(restoreFromSnapshot != null)
984 for(DatastoreSnapshot.ShardSnapshot snapshot: restoreFromSnapshot.getShardSnapshots()) {
985 shardSnapshots.put(snapshot.getName(), snapshot);
989 restoreFromSnapshot = null; // null out to GC
991 for(String shardName : memberShardNames){
992 ShardIdentifier shardId = getShardIdentifier(memberName, shardName);
994 LOG.debug("{}: Creating local shard: {}", persistenceId(), shardId);
996 Map<String, String> peerAddresses = getPeerAddresses(shardName);
997 localShards.put(shardName, new ShardInformation(shardName, shardId, peerAddresses,
998 newShardDatastoreContext(shardName), Shard.builder().restoreFromSnapshot(
999 shardSnapshots.get(shardName)), peerAddressResolver));
1004 * Given the name of the shard find the addresses of all it's peers
1008 private Map<String, String> getPeerAddresses(String shardName) {
1009 Collection<MemberName> members = configuration.getMembersFromShardName(shardName);
1010 Map<String, String> peerAddresses = new HashMap<>();
1012 MemberName currentMemberName = this.cluster.getCurrentMemberName();
1014 for (MemberName memberName : members) {
1015 if (!currentMemberName.equals(memberName)) {
1016 ShardIdentifier shardId = getShardIdentifier(memberName, shardName);
1017 String address = peerAddressResolver.getShardActorAddress(shardName, memberName);
1018 peerAddresses.put(shardId.toString(), address);
1021 return peerAddresses;
1025 public SupervisorStrategy supervisorStrategy() {
1027 return new OneForOneStrategy(10, Duration.create("1 minute"),
1028 (Function<Throwable, Directive>) t -> {
1029 LOG.warn("Supervisor Strategy caught unexpected exception - resuming", t);
1030 return SupervisorStrategy.resume();
1037 public String persistenceId() {
1038 return persistenceId;
1042 ShardManagerInfoMBean getMBean(){
1046 private boolean isShardReplicaOperationInProgress(final String shardName, final ActorRef sender) {
1047 if (shardReplicaOperationsInProgress.contains(shardName)) {
1048 String msg = String.format("A shard replica operation for %s is already in progress", shardName);
1049 LOG.debug ("{}: {}", persistenceId(), msg);
1050 sender.tell(new Status.Failure(new IllegalStateException(msg)), getSelf());
1057 private void onAddShardReplica (final AddShardReplica shardReplicaMsg) {
1058 final String shardName = shardReplicaMsg.getShardName();
1060 LOG.debug("{}: onAddShardReplica: {}", persistenceId(), shardReplicaMsg);
1062 // verify the shard with the specified name is present in the cluster configuration
1063 if (!(this.configuration.isShardConfigured(shardName))) {
1064 String msg = String.format("No module configuration exists for shard %s", shardName);
1065 LOG.debug ("{}: {}", persistenceId(), msg);
1066 getSender().tell(new Status.Failure(new IllegalArgumentException(msg)), getSelf());
1070 // Create the localShard
1071 if (schemaContext == null) {
1072 String msg = String.format(
1073 "No SchemaContext is available in order to create a local shard instance for %s", shardName);
1074 LOG.debug ("{}: {}", persistenceId(), msg);
1075 getSender().tell(new Status.Failure(new IllegalStateException(msg)), getSelf());
1079 findPrimary(shardName, new AutoFindPrimaryFailureResponseHandler(getSender(), shardName, persistenceId(), getSelf()) {
1081 public void onRemotePrimaryShardFound(RemotePrimaryShardFound response) {
1082 getSelf().tell(new RunnableMessage() {
1085 addShard(getShardName(), response, getSender());
1087 }, getTargetActor());
1091 public void onLocalPrimaryFound(LocalPrimaryShardFound message) {
1092 sendLocalReplicaAlreadyExistsReply(getShardName(), getTargetActor());
1098 private void sendLocalReplicaAlreadyExistsReply(String shardName, ActorRef sender) {
1099 String msg = String.format("Local shard %s already exists", shardName);
1100 LOG.debug ("{}: {}", persistenceId(), msg);
1101 sender.tell(new Status.Failure(new AlreadyExistsException(msg)), getSelf());
1104 private void addShard(final String shardName, final RemotePrimaryShardFound response, final ActorRef sender) {
1105 if(isShardReplicaOperationInProgress(shardName, sender)) {
1109 shardReplicaOperationsInProgress.add(shardName);
1111 final ShardInformation shardInfo;
1112 final boolean removeShardOnFailure;
1113 ShardInformation existingShardInfo = localShards.get(shardName);
1114 if(existingShardInfo == null) {
1115 removeShardOnFailure = true;
1116 ShardIdentifier shardId = getShardIdentifier(cluster.getCurrentMemberName(), shardName);
1118 DatastoreContext datastoreContext = newShardDatastoreContextBuilder(shardName).customRaftPolicyImplementation(
1119 DisableElectionsRaftPolicy.class.getName()).build();
1121 shardInfo = new ShardInformation(shardName, shardId, getPeerAddresses(shardName), datastoreContext,
1122 Shard.builder(), peerAddressResolver);
1123 shardInfo.setActiveMember(false);
1124 localShards.put(shardName, shardInfo);
1125 shardInfo.setActor(newShardActor(schemaContext, shardInfo));
1127 removeShardOnFailure = false;
1128 shardInfo = existingShardInfo;
1131 String localShardAddress = peerAddressResolver.getShardActorAddress(shardName, cluster.getCurrentMemberName());
1133 //inform ShardLeader to add this shard as a replica by sending an AddServer message
1134 LOG.debug ("{}: Sending AddServer message to peer {} for shard {}", persistenceId(),
1135 response.getPrimaryPath(), shardInfo.getShardId());
1137 Timeout addServerTimeout = new Timeout(shardInfo.getDatastoreContext().getShardLeaderElectionTimeout().
1139 Future<Object> futureObj = ask(getContext().actorSelection(response.getPrimaryPath()),
1140 new AddServer(shardInfo.getShardId().toString(), localShardAddress, true), addServerTimeout);
1142 futureObj.onComplete(new OnComplete<Object>() {
1144 public void onComplete(Throwable failure, Object addServerResponse) {
1145 if (failure != null) {
1146 LOG.debug ("{}: AddServer request to {} for {} failed", persistenceId(),
1147 response.getPrimaryPath(), shardName, failure);
1149 String msg = String.format("AddServer request to leader %s for shard %s failed",
1150 response.getPrimaryPath(), shardName);
1151 self().tell(new ForwardedAddServerFailure(shardName, msg, failure, removeShardOnFailure), sender);
1153 self().tell(new ForwardedAddServerReply(shardInfo, (AddServerReply)addServerResponse,
1154 response.getPrimaryPath(), removeShardOnFailure), sender);
1157 }, new Dispatchers(context().system().dispatchers()).getDispatcher(Dispatchers.DispatcherType.Client));
1160 private void onAddServerFailure(String shardName, String message, Throwable failure, ActorRef sender,
1161 boolean removeShardOnFailure) {
1162 shardReplicaOperationsInProgress.remove(shardName);
1164 if(removeShardOnFailure) {
1165 ShardInformation shardInfo = localShards.remove(shardName);
1166 if (shardInfo.getActor() != null) {
1167 shardInfo.getActor().tell(PoisonPill.getInstance(), getSelf());
1171 sender.tell(new Status.Failure(message == null ? failure :
1172 new RuntimeException(message, failure)), getSelf());
1175 private void onAddServerReply(ShardInformation shardInfo, AddServerReply replyMsg, ActorRef sender,
1176 String leaderPath, boolean removeShardOnFailure) {
1177 String shardName = shardInfo.getShardName();
1178 shardReplicaOperationsInProgress.remove(shardName);
1180 LOG.debug ("{}: Received {} for shard {} from leader {}", persistenceId(), replyMsg, shardName, leaderPath);
1182 if (replyMsg.getStatus() == ServerChangeStatus.OK) {
1183 LOG.debug ("{}: Leader shard successfully added the replica shard {}", persistenceId(), shardName);
1185 // Make the local shard voting capable
1186 shardInfo.setDatastoreContext(newShardDatastoreContext(shardName), getSelf());
1187 shardInfo.setActiveMember(true);
1190 sender.tell(new Status.Success(null), getSelf());
1191 } else if(replyMsg.getStatus() == ServerChangeStatus.ALREADY_EXISTS) {
1192 sendLocalReplicaAlreadyExistsReply(shardName, sender);
1194 LOG.warn ("{}: Leader failed to add shard replica {} with status {}",
1195 persistenceId(), shardName, replyMsg.getStatus());
1197 Exception failure = getServerChangeException(AddServer.class, replyMsg.getStatus(), leaderPath, shardInfo.getShardId());
1199 onAddServerFailure(shardName, null, failure, sender, removeShardOnFailure);
1203 private static Exception getServerChangeException(Class<?> serverChange, ServerChangeStatus serverChangeStatus,
1204 String leaderPath, ShardIdentifier shardId) {
1206 switch (serverChangeStatus) {
1208 failure = new TimeoutException(String.format(
1209 "The shard leader %s timed out trying to replicate the initial data to the new shard %s." +
1210 "Possible causes - there was a problem replicating the data or shard leadership changed while replicating the shard data",
1211 leaderPath, shardId.getShardName()));
1214 failure = createNoShardLeaderException(shardId);
1217 failure = new UnsupportedOperationException(String.format("%s request is not supported for shard %s",
1218 serverChange.getSimpleName(), shardId.getShardName()));
1221 failure = new RuntimeException(String.format(
1222 "%s request to leader %s for shard %s failed with status %s",
1223 serverChange.getSimpleName(), leaderPath, shardId.getShardName(), serverChangeStatus));
1228 private void onRemoveShardReplica (final RemoveShardReplica shardReplicaMsg) {
1229 LOG.debug("{}: onRemoveShardReplica: {}", persistenceId(), shardReplicaMsg);
1231 findPrimary(shardReplicaMsg.getShardName(), new AutoFindPrimaryFailureResponseHandler(getSender(),
1232 shardReplicaMsg.getShardName(), persistenceId(), getSelf()) {
1234 public void onRemotePrimaryShardFound(RemotePrimaryShardFound response) {
1235 doRemoveShardReplicaAsync(response.getPrimaryPath());
1239 public void onLocalPrimaryFound(LocalPrimaryShardFound response) {
1240 doRemoveShardReplicaAsync(response.getPrimaryPath());
1243 private void doRemoveShardReplicaAsync(final String primaryPath) {
1244 getSelf().tell(new RunnableMessage() {
1247 removeShardReplica(shardReplicaMsg, getShardName(), primaryPath, getSender());
1249 }, getTargetActor());
1254 private void persistShardList() {
1255 List<String> shardList = new ArrayList<>(localShards.keySet());
1256 for (ShardInformation shardInfo : localShards.values()) {
1257 if (!shardInfo.isActiveMember()) {
1258 shardList.remove(shardInfo.getShardName());
1261 LOG.debug ("{}: persisting the shard list {}", persistenceId(), shardList);
1262 saveSnapshot(updateShardManagerSnapshot(shardList));
1265 private ShardManagerSnapshot updateShardManagerSnapshot(List<String> shardList) {
1266 currentSnapshot = new ShardManagerSnapshot(shardList);
1267 return currentSnapshot;
1270 private void applyShardManagerSnapshot(ShardManagerSnapshot snapshot) {
1271 currentSnapshot = snapshot;
1273 LOG.debug ("{}: onSnapshotOffer: {}", persistenceId(), currentSnapshot);
1275 final MemberName currentMember = cluster.getCurrentMemberName();
1276 Set<String> configuredShardList =
1277 new HashSet<>(configuration.getMemberShardNames(currentMember));
1278 for (String shard : currentSnapshot.getShardList()) {
1279 if (!configuredShardList.contains(shard)) {
1280 // add the current member as a replica for the shard
1281 LOG.debug ("{}: adding shard {}", persistenceId(), shard);
1282 configuration.addMemberReplicaForShard(shard, currentMember);
1284 configuredShardList.remove(shard);
1287 for (String shard : configuredShardList) {
1288 // remove the member as a replica for the shard
1289 LOG.debug ("{}: removing shard {}", persistenceId(), shard);
1290 configuration.removeMemberReplicaForShard(shard, currentMember);
1294 private void onSaveSnapshotSuccess (SaveSnapshotSuccess successMessage) {
1295 LOG.debug ("{} saved ShardManager snapshot successfully. Deleting the prev snapshot if available",
1297 deleteSnapshots(new SnapshotSelectionCriteria(scala.Long.MaxValue(), successMessage.metadata().timestamp() - 1,
1301 private void onChangeShardServersVotingStatus(final ChangeShardMembersVotingStatus changeMembersVotingStatus) {
1302 LOG.debug("{}: onChangeShardServersVotingStatus: {}", persistenceId(), changeMembersVotingStatus);
1304 String shardName = changeMembersVotingStatus.getShardName();
1305 Map<String, Boolean> serverVotingStatusMap = new HashMap<>();
1306 for(Entry<String, Boolean> e: changeMembersVotingStatus.getMeberVotingStatusMap().entrySet()) {
1307 serverVotingStatusMap.put(getShardIdentifier(MemberName.forName(e.getKey()), shardName).toString(),
1311 ChangeServersVotingStatus changeServersVotingStatus = new ChangeServersVotingStatus(serverVotingStatusMap);
1313 findLocalShard(shardName, getSender(),
1314 localShardFound -> changeShardMembersVotingStatus(changeServersVotingStatus, shardName,
1315 localShardFound.getPath(), getSender()));
1318 private void onFlipShardMembersVotingStatus(FlipShardMembersVotingStatus flipMembersVotingStatus) {
1319 LOG.debug("{}: onFlipShardMembersVotingStatus: {}", persistenceId(), flipMembersVotingStatus);
1321 ActorRef sender = getSender();
1322 final String shardName = flipMembersVotingStatus.getShardName();
1323 findLocalShard(shardName, sender, localShardFound -> {
1324 Future<Object> future = ask(localShardFound.getPath(), GetOnDemandRaftState.INSTANCE,
1325 Timeout.apply(30, TimeUnit.SECONDS));
1327 future.onComplete(new OnComplete<Object>() {
1329 public void onComplete(Throwable failure, Object response) {
1330 if (failure != null) {
1331 sender.tell(new Status.Failure(new RuntimeException(
1332 String.format("Failed to access local shard %s", shardName), failure)), self());
1336 OnDemandRaftState raftState = (OnDemandRaftState) response;
1337 Map<String, Boolean> serverVotingStatusMap = new HashMap<>();
1338 for(Entry<String, Boolean> e: raftState.getPeerVotingStates().entrySet()) {
1339 serverVotingStatusMap.put(e.getKey(), !e.getValue());
1342 serverVotingStatusMap.put(getShardIdentifier(cluster.getCurrentMemberName(), shardName).
1343 toString(), !raftState.isVoting());
1345 changeShardMembersVotingStatus(new ChangeServersVotingStatus(serverVotingStatusMap),
1346 shardName, localShardFound.getPath(), sender);
1348 }, new Dispatchers(context().system().dispatchers()).getDispatcher(Dispatchers.DispatcherType.Client));
1353 private void findLocalShard(final String shardName, final ActorRef sender,
1354 final Consumer<LocalShardFound> onLocalShardFound) {
1355 Timeout findLocalTimeout = new Timeout(datastoreContextFactory.getBaseDatastoreContext().
1356 getShardInitializationTimeout().duration().$times(2));
1358 Future<Object> futureObj = ask(getSelf(), new FindLocalShard(shardName, true), findLocalTimeout);
1359 futureObj.onComplete(new OnComplete<Object>() {
1361 public void onComplete(Throwable failure, Object response) {
1362 if (failure != null) {
1363 LOG.debug ("{}: Received failure from FindLocalShard for shard {}", persistenceId, shardName, failure);
1364 sender.tell(new Status.Failure(new RuntimeException(
1365 String.format("Failed to find local shard %s", shardName), failure)), self());
1367 if(response instanceof LocalShardFound) {
1368 getSelf().tell(new RunnableMessage() {
1371 onLocalShardFound.accept((LocalShardFound) response);
1374 } else if(response instanceof LocalShardNotFound) {
1375 String msg = String.format("Local shard %s does not exist", shardName);
1376 LOG.debug ("{}: {}", persistenceId, msg);
1377 sender.tell(new Status.Failure(new IllegalArgumentException(msg)), self());
1379 String msg = String.format("Failed to find local shard %s: received response: %s",
1380 shardName, response);
1381 LOG.debug ("{}: {}", persistenceId, msg);
1382 sender.tell(new Status.Failure(response instanceof Throwable ? (Throwable) response :
1383 new RuntimeException(msg)), self());
1387 }, new Dispatchers(context().system().dispatchers()).getDispatcher(Dispatchers.DispatcherType.Client));
1390 private void changeShardMembersVotingStatus(ChangeServersVotingStatus changeServersVotingStatus,
1391 final String shardName, final ActorRef shardActorRef, final ActorRef sender) {
1392 if(isShardReplicaOperationInProgress(shardName, sender)) {
1396 shardReplicaOperationsInProgress.add(shardName);
1398 DatastoreContext datastoreContext = newShardDatastoreContextBuilder(shardName).build();
1399 final ShardIdentifier shardId = getShardIdentifier(cluster.getCurrentMemberName(), shardName);
1401 LOG.debug("{}: Sending ChangeServersVotingStatus message {} to local shard {}", persistenceId(),
1402 changeServersVotingStatus, shardActorRef.path());
1404 Timeout timeout = new Timeout(datastoreContext.getShardLeaderElectionTimeout().duration().$times(2));
1405 Future<Object> futureObj = ask(shardActorRef, changeServersVotingStatus, timeout);
1407 futureObj.onComplete(new OnComplete<Object>() {
1409 public void onComplete(Throwable failure, Object response) {
1410 shardReplicaOperationsInProgress.remove(shardName);
1411 if (failure != null) {
1412 String msg = String.format("ChangeServersVotingStatus request to local shard %s failed",
1413 shardActorRef.path());
1414 LOG.debug ("{}: {}", persistenceId(), msg, failure);
1415 sender.tell(new Status.Failure(new RuntimeException(msg, failure)), self());
1417 LOG.debug ("{}: Received {} from local shard {}", persistenceId(), response, shardActorRef.path());
1419 ServerChangeReply replyMsg = (ServerChangeReply) response;
1420 if(replyMsg.getStatus() == ServerChangeStatus.OK) {
1421 LOG.debug ("{}: ChangeServersVotingStatus succeeded for shard {}", persistenceId(), shardName);
1422 sender.tell(new Status.Success(null), getSelf());
1423 } else if(replyMsg.getStatus() == ServerChangeStatus.INVALID_REQUEST) {
1424 sender.tell(new Status.Failure(new IllegalArgumentException(String.format(
1425 "The requested voting state change for shard %s is invalid. At least one member must be voting",
1426 shardId.getShardName()))), getSelf());
1428 LOG.warn ("{}: ChangeServersVotingStatus failed for shard {} with status {}",
1429 persistenceId(), shardName, replyMsg.getStatus());
1431 Exception error = getServerChangeException(ChangeServersVotingStatus.class,
1432 replyMsg.getStatus(), shardActorRef.path().toString(), shardId);
1433 sender.tell(new Status.Failure(error), getSelf());
1437 }, new Dispatchers(context().system().dispatchers()).getDispatcher(Dispatchers.DispatcherType.Client));
1440 private static final class ForwardedAddServerReply {
1441 ShardInformation shardInfo;
1442 AddServerReply addServerReply;
1444 boolean removeShardOnFailure;
1446 ForwardedAddServerReply(ShardInformation shardInfo, AddServerReply addServerReply, String leaderPath,
1447 boolean removeShardOnFailure) {
1448 this.shardInfo = shardInfo;
1449 this.addServerReply = addServerReply;
1450 this.leaderPath = leaderPath;
1451 this.removeShardOnFailure = removeShardOnFailure;
1455 private static final class ForwardedAddServerFailure {
1457 String failureMessage;
1459 boolean removeShardOnFailure;
1461 ForwardedAddServerFailure(String shardName, String failureMessage, Throwable failure,
1462 boolean removeShardOnFailure) {
1463 this.shardName = shardName;
1464 this.failureMessage = failureMessage;
1465 this.failure = failure;
1466 this.removeShardOnFailure = removeShardOnFailure;
1470 static class OnShardInitialized {
1471 private final Runnable replyRunnable;
1472 private Cancellable timeoutSchedule;
1474 OnShardInitialized(Runnable replyRunnable) {
1475 this.replyRunnable = replyRunnable;
1478 Runnable getReplyRunnable() {
1479 return replyRunnable;
1482 Cancellable getTimeoutSchedule() {
1483 return timeoutSchedule;
1486 void setTimeoutSchedule(Cancellable timeoutSchedule) {
1487 this.timeoutSchedule = timeoutSchedule;
1491 static class OnShardReady extends OnShardInitialized {
1492 OnShardReady(Runnable replyRunnable) {
1493 super(replyRunnable);
1497 private void findPrimary(final String shardName, final FindPrimaryResponseHandler handler) {
1498 Timeout findPrimaryTimeout = new Timeout(datastoreContextFactory.getBaseDatastoreContext().
1499 getShardInitializationTimeout().duration().$times(2));
1502 Future<Object> futureObj = ask(getSelf(), new FindPrimary(shardName, true), findPrimaryTimeout);
1503 futureObj.onComplete(new OnComplete<Object>() {
1505 public void onComplete(Throwable failure, Object response) {
1506 if (failure != null) {
1507 handler.onFailure(failure);
1509 if(response instanceof RemotePrimaryShardFound) {
1510 handler.onRemotePrimaryShardFound((RemotePrimaryShardFound) response);
1511 } else if(response instanceof LocalPrimaryShardFound) {
1512 handler.onLocalPrimaryFound((LocalPrimaryShardFound) response);
1514 handler.onUnknownResponse(response);
1518 }, new Dispatchers(context().system().dispatchers()).getDispatcher(Dispatchers.DispatcherType.Client));
1521 private static interface RunnableMessage extends Runnable {
1525 * The FindPrimaryResponseHandler provides specific callback methods which are invoked when a response to the
1526 * a remote or local find primary message is processed
1528 private static interface FindPrimaryResponseHandler {
1530 * Invoked when a Failure message is received as a response
1534 void onFailure(Throwable failure);
1537 * Invoked when a RemotePrimaryShardFound response is received
1541 void onRemotePrimaryShardFound(RemotePrimaryShardFound response);
1544 * Invoked when a LocalPrimaryShardFound response is received
1547 void onLocalPrimaryFound(LocalPrimaryShardFound response);
1550 * Invoked when an unknown response is received. This is another type of failure.
1554 void onUnknownResponse(Object response);
1558 * The AutoFindPrimaryFailureResponseHandler automatically processes Failure responses when finding a primary
1559 * replica and sends a wrapped Failure response to some targetActor
1561 private static abstract class AutoFindPrimaryFailureResponseHandler implements FindPrimaryResponseHandler {
1562 private final ActorRef targetActor;
1563 private final String shardName;
1564 private final String persistenceId;
1565 private final ActorRef shardManagerActor;
1568 * @param targetActor The actor to whom the Failure response should be sent when a FindPrimary failure occurs
1569 * @param shardName The name of the shard for which the primary replica had to be found
1570 * @param persistenceId The persistenceId for the ShardManager
1571 * @param shardManagerActor The ShardManager actor which triggered the call to FindPrimary
1573 protected AutoFindPrimaryFailureResponseHandler(ActorRef targetActor, String shardName, String persistenceId, ActorRef shardManagerActor){
1574 this.targetActor = Preconditions.checkNotNull(targetActor);
1575 this.shardName = Preconditions.checkNotNull(shardName);
1576 this.persistenceId = Preconditions.checkNotNull(persistenceId);
1577 this.shardManagerActor = Preconditions.checkNotNull(shardManagerActor);
1580 public ActorRef getTargetActor() {
1584 public String getShardName() {
1589 public void onFailure(Throwable failure) {
1590 LOG.debug ("{}: Received failure from FindPrimary for shard {}", persistenceId, shardName, failure);
1591 targetActor.tell(new Status.Failure(new RuntimeException(
1592 String.format("Failed to find leader for shard %s", shardName), failure)), shardManagerActor);
1596 public void onUnknownResponse(Object response) {
1597 String msg = String.format("Failed to find leader for shard %s: received response: %s",
1598 shardName, response);
1599 LOG.debug ("{}: {}", persistenceId, msg);
1600 targetActor.tell(new Status.Failure(response instanceof Throwable ? (Throwable) response :
1601 new RuntimeException(msg)), shardManagerActor);
1606 * The WrappedShardResponse class wraps a response from a Shard.
1608 private static final class WrappedShardResponse {
1609 private final ShardIdentifier shardId;
1610 private final Object response;
1611 private final String leaderPath;
1613 WrappedShardResponse(ShardIdentifier shardId, Object response, String leaderPath) {
1614 this.shardId = shardId;
1615 this.response = response;
1616 this.leaderPath = leaderPath;
1619 ShardIdentifier getShardId() {
1623 Object getResponse() {
1627 String getLeaderPath() {
1632 private static final class ShardNotInitializedTimeout {
1633 private final ActorRef sender;
1634 private final ShardInformation shardInfo;
1635 private final OnShardInitialized onShardInitialized;
1637 ShardNotInitializedTimeout(ShardInformation shardInfo, OnShardInitialized onShardInitialized, ActorRef sender) {
1638 this.sender = sender;
1639 this.shardInfo = shardInfo;
1640 this.onShardInitialized = onShardInitialized;
1643 ActorRef getSender() {
1647 ShardInformation getShardInfo() {
1651 OnShardInitialized getOnShardInitialized() {
1652 return onShardInitialized;