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;
11 import akka.actor.ActorRef;
12 import akka.actor.ActorSelection;
13 import akka.actor.Cancellable;
14 import akka.actor.Props;
15 import akka.japi.Creator;
16 import akka.persistence.RecoveryFailure;
17 import akka.serialization.Serialization;
18 import com.google.common.annotations.VisibleForTesting;
19 import com.google.common.base.Optional;
20 import com.google.common.base.Preconditions;
21 import java.io.IOException;
22 import java.util.HashMap;
24 import java.util.concurrent.TimeUnit;
25 import javax.annotation.Nonnull;
26 import org.opendaylight.controller.cluster.common.actor.CommonConfig;
27 import org.opendaylight.controller.cluster.common.actor.MeteringBehavior;
28 import org.opendaylight.controller.cluster.datastore.ShardCommitCoordinator.CohortEntry;
29 import org.opendaylight.controller.cluster.datastore.exceptions.NoShardLeaderException;
30 import org.opendaylight.controller.cluster.datastore.identifiers.ShardIdentifier;
31 import org.opendaylight.controller.cluster.datastore.identifiers.ShardTransactionIdentifier;
32 import org.opendaylight.controller.cluster.datastore.jmx.mbeans.shard.ShardMBeanFactory;
33 import org.opendaylight.controller.cluster.datastore.jmx.mbeans.shard.ShardStats;
34 import org.opendaylight.controller.cluster.datastore.messages.AbortTransaction;
35 import org.opendaylight.controller.cluster.datastore.messages.ActorInitialized;
36 import org.opendaylight.controller.cluster.datastore.messages.BatchedModifications;
37 import org.opendaylight.controller.cluster.datastore.messages.CanCommitTransaction;
38 import org.opendaylight.controller.cluster.datastore.messages.CloseTransactionChain;
39 import org.opendaylight.controller.cluster.datastore.messages.CommitTransaction;
40 import org.opendaylight.controller.cluster.datastore.messages.CommitTransactionReply;
41 import org.opendaylight.controller.cluster.datastore.messages.CreateTransaction;
42 import org.opendaylight.controller.cluster.datastore.messages.CreateTransactionReply;
43 import org.opendaylight.controller.cluster.datastore.messages.ForwardedReadyTransaction;
44 import org.opendaylight.controller.cluster.datastore.messages.PeerAddressResolved;
45 import org.opendaylight.controller.cluster.datastore.messages.ReadyLocalTransaction;
46 import org.opendaylight.controller.cluster.datastore.messages.RegisterChangeListener;
47 import org.opendaylight.controller.cluster.datastore.messages.RegisterDataTreeChangeListener;
48 import org.opendaylight.controller.cluster.datastore.messages.ShardLeaderStateChanged;
49 import org.opendaylight.controller.cluster.datastore.messages.UpdateSchemaContext;
50 import org.opendaylight.controller.cluster.datastore.modification.Modification;
51 import org.opendaylight.controller.cluster.datastore.modification.ModificationPayload;
52 import org.opendaylight.controller.cluster.datastore.modification.MutableCompositeModification;
53 import org.opendaylight.controller.cluster.datastore.utils.Dispatchers;
54 import org.opendaylight.controller.cluster.datastore.utils.MessageTracker;
55 import org.opendaylight.controller.cluster.notifications.LeaderStateChanged;
56 import org.opendaylight.controller.cluster.notifications.RegisterRoleChangeListener;
57 import org.opendaylight.controller.cluster.notifications.RoleChangeNotifier;
58 import org.opendaylight.controller.cluster.raft.RaftActor;
59 import org.opendaylight.controller.cluster.raft.RaftActorRecoveryCohort;
60 import org.opendaylight.controller.cluster.raft.RaftActorSnapshotCohort;
61 import org.opendaylight.controller.cluster.raft.RaftState;
62 import org.opendaylight.controller.cluster.raft.base.messages.FollowerInitialSyncUpStatus;
63 import org.opendaylight.controller.cluster.raft.messages.AppendEntriesReply;
64 import org.opendaylight.controller.cluster.raft.protobuff.client.messages.CompositeModificationByteStringPayload;
65 import org.opendaylight.controller.cluster.raft.protobuff.client.messages.CompositeModificationPayload;
66 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTree;
67 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidate;
68 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataValidationFailedException;
69 import org.opendaylight.yangtools.yang.data.api.schema.tree.ModificationType;
70 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
71 import scala.concurrent.duration.Duration;
72 import scala.concurrent.duration.FiniteDuration;
75 * A Shard represents a portion of the logical data tree <br/>
77 * Our Shard uses InMemoryDataTree as it's internal representation and delegates all requests it
80 public class Shard extends RaftActor {
82 protected static final Object TX_COMMIT_TIMEOUT_CHECK_MESSAGE = "txCommitTimeoutCheck";
85 static final Object GET_SHARD_MBEAN_MESSAGE = "getShardMBeanMessage";
88 static final String DEFAULT_NAME = "default";
90 // The state of this Shard
91 private final ShardDataTree store;
93 /// The name of this shard
94 private final String name;
96 private final ShardStats shardMBean;
98 private DatastoreContext datastoreContext;
100 private final ShardCommitCoordinator commitCoordinator;
102 private long transactionCommitTimeout;
104 private Cancellable txCommitTimeoutCheckSchedule;
106 private final Optional<ActorRef> roleChangeNotifier;
108 private final MessageTracker appendEntriesReplyTracker;
110 private final ShardTransactionActorFactory transactionActorFactory;
112 private final ShardSnapshotCohort snapshotCohort;
114 private final DataTreeChangeListenerSupport treeChangeSupport = new DataTreeChangeListenerSupport(this);
115 private final DataChangeListenerSupport changeSupport = new DataChangeListenerSupport(this);
117 protected Shard(final ShardIdentifier name, final Map<String, String> peerAddresses,
118 final DatastoreContext datastoreContext, final SchemaContext schemaContext) {
119 super(name.toString(), new HashMap<>(peerAddresses), Optional.of(datastoreContext.getShardRaftConfig()),
120 DataStoreVersions.CURRENT_VERSION);
122 this.name = name.toString();
123 this.datastoreContext = datastoreContext;
125 setPersistence(datastoreContext.isPersistent());
127 LOG.info("Shard created : {}, persistent : {}", name, datastoreContext.isPersistent());
129 store = new ShardDataTree(schemaContext);
131 shardMBean = ShardMBeanFactory.getShardStatsMBean(name.toString(),
132 datastoreContext.getDataStoreMXBeanType());
133 shardMBean.setShard(this);
135 if (isMetricsCaptureEnabled()) {
136 getContext().become(new MeteringBehavior(this));
139 commitCoordinator = new ShardCommitCoordinator(store,
140 datastoreContext.getShardCommitQueueExpiryTimeoutInMillis(),
141 datastoreContext.getShardTransactionCommitQueueCapacity(), self(), LOG, this.name);
143 setTransactionCommitTimeout();
145 // create a notifier actor for each cluster member
146 roleChangeNotifier = createRoleChangeNotifier(name.toString());
148 appendEntriesReplyTracker = new MessageTracker(AppendEntriesReply.class,
149 getRaftActorContext().getConfigParams().getIsolatedCheckIntervalInMillis());
151 transactionActorFactory = new ShardTransactionActorFactory(store, datastoreContext,
152 new Dispatchers(context().system().dispatchers()).getDispatcherPath(
153 Dispatchers.DispatcherType.Transaction), self(), getContext(), shardMBean);
155 snapshotCohort = new ShardSnapshotCohort(transactionActorFactory, store, LOG, this.name);
160 private void setTransactionCommitTimeout() {
161 transactionCommitTimeout = TimeUnit.MILLISECONDS.convert(
162 datastoreContext.getShardTransactionCommitTimeoutInSeconds(), TimeUnit.SECONDS) / 2;
165 public static Props props(final ShardIdentifier name,
166 final Map<String, String> peerAddresses,
167 final DatastoreContext datastoreContext, final SchemaContext schemaContext) {
168 Preconditions.checkNotNull(name, "name should not be null");
169 Preconditions.checkNotNull(peerAddresses, "peerAddresses should not be null");
170 Preconditions.checkNotNull(datastoreContext, "dataStoreContext should not be null");
171 Preconditions.checkNotNull(schemaContext, "schemaContext should not be null");
173 return Props.create(new ShardCreator(name, peerAddresses, datastoreContext, schemaContext));
176 private Optional<ActorRef> createRoleChangeNotifier(String shardId) {
177 ActorRef shardRoleChangeNotifier = this.getContext().actorOf(
178 RoleChangeNotifier.getProps(shardId), shardId + "-notifier");
179 return Optional.of(shardRoleChangeNotifier);
183 public void postStop() {
184 LOG.info("Stopping Shard {}", persistenceId());
188 if(txCommitTimeoutCheckSchedule != null) {
189 txCommitTimeoutCheckSchedule.cancel();
192 shardMBean.unregisterMBean();
196 public void onReceiveRecover(final Object message) throws Exception {
197 if(LOG.isDebugEnabled()) {
198 LOG.debug("{}: onReceiveRecover: Received message {} from {}", persistenceId(),
199 message.getClass().toString(), getSender());
202 if (message instanceof RecoveryFailure){
203 LOG.error("{}: Recovery failed because of this cause",
204 persistenceId(), ((RecoveryFailure) message).cause());
206 // Even though recovery failed, we still need to finish our recovery, eg send the
207 // ActorInitialized message and start the txCommitTimeoutCheckSchedule.
208 onRecoveryComplete();
210 super.onReceiveRecover(message);
211 if(LOG.isTraceEnabled()) {
212 appendEntriesReplyTracker.begin();
218 public void onReceiveCommand(final Object message) throws Exception {
220 MessageTracker.Context context = appendEntriesReplyTracker.received(message);
222 if(context.error().isPresent()){
223 LOG.trace("{} : AppendEntriesReply failed to arrive at the expected interval {}", persistenceId(),
228 if (CreateTransaction.SERIALIZABLE_CLASS.isInstance(message)) {
229 handleCreateTransaction(message);
230 } else if (BatchedModifications.class.isInstance(message)) {
231 handleBatchedModifications((BatchedModifications)message);
232 } else if (message instanceof ForwardedReadyTransaction) {
233 commitCoordinator.handleForwardedReadyTransaction((ForwardedReadyTransaction) message,
235 } else if (message instanceof ReadyLocalTransaction) {
236 handleReadyLocalTransaction((ReadyLocalTransaction)message);
237 } else if (CanCommitTransaction.SERIALIZABLE_CLASS.isInstance(message)) {
238 handleCanCommitTransaction(CanCommitTransaction.fromSerializable(message));
239 } else if (CommitTransaction.SERIALIZABLE_CLASS.isInstance(message)) {
240 handleCommitTransaction(CommitTransaction.fromSerializable(message));
241 } else if (AbortTransaction.SERIALIZABLE_CLASS.isInstance(message)) {
242 handleAbortTransaction(AbortTransaction.fromSerializable(message));
243 } else if (CloseTransactionChain.SERIALIZABLE_CLASS.isInstance(message)) {
244 closeTransactionChain(CloseTransactionChain.fromSerializable(message));
245 } else if (message instanceof RegisterChangeListener) {
246 changeSupport.onMessage((RegisterChangeListener) message, isLeader(), hasLeader());
247 } else if (message instanceof RegisterDataTreeChangeListener) {
248 treeChangeSupport.onMessage((RegisterDataTreeChangeListener) message, isLeader(), hasLeader());
249 } else if (message instanceof UpdateSchemaContext) {
250 updateSchemaContext((UpdateSchemaContext) message);
251 } else if (message instanceof PeerAddressResolved) {
252 PeerAddressResolved resolved = (PeerAddressResolved) message;
253 setPeerAddress(resolved.getPeerId().toString(),
254 resolved.getPeerAddress());
255 } else if (message.equals(TX_COMMIT_TIMEOUT_CHECK_MESSAGE)) {
256 handleTransactionCommitTimeoutCheck();
257 } else if(message instanceof DatastoreContext) {
258 onDatastoreContext((DatastoreContext)message);
259 } else if(message instanceof RegisterRoleChangeListener){
260 roleChangeNotifier.get().forward(message, context());
261 } else if (message instanceof FollowerInitialSyncUpStatus) {
262 shardMBean.setFollowerInitialSyncStatus(((FollowerInitialSyncUpStatus) message).isInitialSyncDone());
263 context().parent().tell(message, self());
264 } else if(GET_SHARD_MBEAN_MESSAGE.equals(message)){
265 sender().tell(getShardMBean(), self());
267 super.onReceiveCommand(message);
274 private boolean hasLeader() {
275 return getLeaderId() != null;
278 public int getPendingTxCommitQueueSize() {
279 return commitCoordinator.getQueueSize();
283 protected Optional<ActorRef> getRoleChangeNotifier() {
284 return roleChangeNotifier;
288 protected LeaderStateChanged newLeaderStateChanged(String memberId, String leaderId, short leaderPayloadVersion) {
289 return new ShardLeaderStateChanged(memberId, leaderId,
290 isLeader() ? Optional.<DataTree>of(store.getDataTree()) : Optional.<DataTree>absent(),
291 leaderPayloadVersion);
294 private void onDatastoreContext(DatastoreContext context) {
295 datastoreContext = context;
297 commitCoordinator.setQueueCapacity(datastoreContext.getShardTransactionCommitQueueCapacity());
299 setTransactionCommitTimeout();
301 if(datastoreContext.isPersistent() && !persistence().isRecoveryApplicable()) {
302 setPersistence(true);
303 } else if(!datastoreContext.isPersistent() && persistence().isRecoveryApplicable()) {
304 setPersistence(false);
307 updateConfigParams(datastoreContext.getShardRaftConfig());
310 private void handleTransactionCommitTimeoutCheck() {
311 CohortEntry cohortEntry = commitCoordinator.getCurrentCohortEntry();
312 if(cohortEntry != null) {
313 if(cohortEntry.isExpired(transactionCommitTimeout)) {
314 LOG.warn("{}: Current transaction {} has timed out after {} ms - aborting",
315 persistenceId(), cohortEntry.getTransactionID(), transactionCommitTimeout);
317 doAbortTransaction(cohortEntry.getTransactionID(), null);
321 commitCoordinator.cleanupExpiredCohortEntries();
324 private static boolean isEmptyCommit(final DataTreeCandidate candidate) {
325 return ModificationType.UNMODIFIED.equals(candidate.getRootNode().getModificationType());
328 void continueCommit(final CohortEntry cohortEntry) throws Exception {
329 final DataTreeCandidate candidate = cohortEntry.getCandidate();
331 // If we do not have any followers and we are not using persistence
332 // or if cohortEntry has no modifications
333 // we can apply modification to the state immediately
334 if ((!hasFollowers() && !persistence().isRecoveryApplicable()) || isEmptyCommit(candidate)) {
335 applyModificationToState(cohortEntry.getReplySender(), cohortEntry.getTransactionID(), candidate);
337 Shard.this.persistData(cohortEntry.getReplySender(), cohortEntry.getTransactionID(),
338 DataTreeCandidatePayload.create(candidate));
342 private void handleCommitTransaction(final CommitTransaction commit) {
343 if(!commitCoordinator.handleCommit(commit.getTransactionID(), getSender(), this)) {
344 shardMBean.incrementFailedTransactionsCount();
348 private void finishCommit(@Nonnull final ActorRef sender, @Nonnull final String transactionID, @Nonnull final CohortEntry cohortEntry) {
349 LOG.debug("{}: Finishing commit for transaction {}", persistenceId(), cohortEntry.getTransactionID());
352 cohortEntry.commit();
354 sender.tell(CommitTransactionReply.INSTANCE.toSerializable(), getSelf());
356 shardMBean.incrementCommittedTransactionCount();
357 shardMBean.setLastCommittedTransactionTime(System.currentTimeMillis());
359 } catch (Exception e) {
360 sender.tell(new akka.actor.Status.Failure(e), getSelf());
362 LOG.error("{}, An exception occurred while committing transaction {}", persistenceId(),
364 shardMBean.incrementFailedTransactionsCount();
366 commitCoordinator.currentTransactionComplete(transactionID, true);
370 private void finishCommit(@Nonnull final ActorRef sender, final @Nonnull String transactionID) {
371 // With persistence enabled, this method is called via applyState by the leader strategy
372 // after the commit has been replicated to a majority of the followers.
374 CohortEntry cohortEntry = commitCoordinator.getCohortEntryIfCurrent(transactionID);
375 if (cohortEntry == null) {
376 // The transaction is no longer the current commit. This can happen if the transaction
377 // was aborted prior, most likely due to timeout in the front-end. We need to finish
378 // committing the transaction though since it was successfully persisted and replicated
379 // however we can't use the original cohort b/c it was already preCommitted and may
380 // conflict with the current commit or may have been aborted so we commit with a new
382 cohortEntry = commitCoordinator.getAndRemoveCohortEntry(transactionID);
383 if(cohortEntry != null) {
385 store.applyForeignCandidate(transactionID, cohortEntry.getCandidate());
386 } catch (DataValidationFailedException e) {
387 shardMBean.incrementFailedTransactionsCount();
388 LOG.error("{}: Failed to re-apply transaction {}", persistenceId(), transactionID, e);
391 sender.tell(CommitTransactionReply.INSTANCE.toSerializable(), getSelf());
393 // This really shouldn't happen - it likely means that persistence or replication
394 // took so long to complete such that the cohort entry was expired from the cache.
395 IllegalStateException ex = new IllegalStateException(
396 String.format("%s: Could not finish committing transaction %s - no CohortEntry found",
397 persistenceId(), transactionID));
398 LOG.error(ex.getMessage());
399 sender.tell(new akka.actor.Status.Failure(ex), getSelf());
402 finishCommit(sender, transactionID, cohortEntry);
406 private void handleCanCommitTransaction(final CanCommitTransaction canCommit) {
407 LOG.debug("{}: Can committing transaction {}", persistenceId(), canCommit.getTransactionID());
408 commitCoordinator.handleCanCommit(canCommit.getTransactionID(), getSender(), this);
411 private void noLeaderError(String errMessage, Object message) {
412 // TODO: rather than throwing an immediate exception, we could schedule a timer to try again to make
413 // it more resilient in case we're in the process of electing a new leader.
414 getSender().tell(new akka.actor.Status.Failure(new NoShardLeaderException(errMessage, persistenceId())), getSelf());
417 private void handleBatchedModifications(BatchedModifications batched) {
418 // This message is sent to prepare the modifications transaction directly on the Shard as an
419 // optimization to avoid the extra overhead of a separate ShardTransaction actor. On the last
420 // BatchedModifications message, the caller sets the ready flag in the message indicating
421 // modifications are complete. The reply contains the cohort actor path (this actor) for the caller
422 // to initiate the 3-phase commit. This also avoids the overhead of sending an additional
423 // ReadyTransaction message.
425 // If we're not the leader then forward to the leader. This is a safety measure - we shouldn't
426 // normally get here if we're not the leader as the front-end (TransactionProxy) should determine
427 // the primary/leader shard. However with timing and caching on the front-end, there's a small
428 // window where it could have a stale leader during leadership transitions.
431 failIfIsolatedLeader(getSender());
434 commitCoordinator.handleBatchedModifications(batched, getSender(), this);
435 } catch (Exception e) {
436 LOG.error("{}: Error handling BatchedModifications for Tx {}", persistenceId(),
437 batched.getTransactionID(), e);
438 getSender().tell(new akka.actor.Status.Failure(e), getSelf());
441 ActorSelection leader = getLeader();
443 // TODO: what if this is not the first batch and leadership changed in between batched messages?
444 // We could check if the commitCoordinator already has a cached entry and forward all the previous
445 // batched modifications.
446 LOG.debug("{}: Forwarding BatchedModifications to leader {}", persistenceId(), leader);
447 leader.forward(batched, getContext());
449 noLeaderError("Could not commit transaction " + batched.getTransactionID(), batched);
454 private boolean failIfIsolatedLeader(ActorRef sender) {
455 if(getRaftState() == RaftState.IsolatedLeader) {
456 sender.tell(new akka.actor.Status.Failure(new NoShardLeaderException(String.format(
457 "Shard %s was the leader but has lost contact with all of its followers. Either all" +
458 " other follower nodes are down or this node is isolated by a network partition.",
459 persistenceId()))), getSelf());
466 private void handleReadyLocalTransaction(final ReadyLocalTransaction message) {
468 failIfIsolatedLeader(getSender());
471 commitCoordinator.handleReadyLocalTransaction(message, getSender(), this);
472 } catch (Exception e) {
473 LOG.error("{}: Error handling ReadyLocalTransaction for Tx {}", persistenceId(),
474 message.getTransactionID(), e);
475 getSender().tell(new akka.actor.Status.Failure(e), getSelf());
478 ActorSelection leader = getLeader();
479 if (leader != null) {
480 LOG.debug("{}: Forwarding ReadyLocalTransaction to leader {}", persistenceId(), leader);
481 message.setRemoteVersion(getCurrentBehavior().getLeaderPayloadVersion());
482 leader.forward(message, getContext());
484 noLeaderError("Could not commit transaction " + message.getTransactionID(), message);
489 private void handleAbortTransaction(final AbortTransaction abort) {
490 doAbortTransaction(abort.getTransactionID(), getSender());
493 void doAbortTransaction(final String transactionID, final ActorRef sender) {
494 commitCoordinator.handleAbort(transactionID, sender, this);
497 private void handleCreateTransaction(final Object message) {
499 createTransaction(CreateTransaction.fromSerializable(message));
500 } else if (getLeader() != null) {
501 getLeader().forward(message, getContext());
503 getSender().tell(new akka.actor.Status.Failure(new NoShardLeaderException(
504 "Could not create a shard transaction", persistenceId())), getSelf());
508 private void closeTransactionChain(final CloseTransactionChain closeTransactionChain) {
509 store.closeTransactionChain(closeTransactionChain.getTransactionChainId());
512 private ActorRef createTypedTransactionActor(int transactionType,
513 ShardTransactionIdentifier transactionId, String transactionChainId,
514 short clientVersion ) {
516 return transactionActorFactory.newShardTransaction(TransactionType.fromInt(transactionType),
517 transactionId, transactionChainId, clientVersion);
520 private void createTransaction(CreateTransaction createTransaction) {
522 if(TransactionType.fromInt(createTransaction.getTransactionType()) != TransactionType.READ_ONLY &&
523 failIfIsolatedLeader(getSender())) {
527 ActorRef transactionActor = createTransaction(createTransaction.getTransactionType(),
528 createTransaction.getTransactionId(), createTransaction.getTransactionChainId(),
529 createTransaction.getVersion());
531 getSender().tell(new CreateTransactionReply(Serialization.serializedActorPath(transactionActor),
532 createTransaction.getTransactionId()).toSerializable(), getSelf());
533 } catch (Exception e) {
534 getSender().tell(new akka.actor.Status.Failure(e), getSelf());
538 private ActorRef createTransaction(int transactionType, String remoteTransactionId,
539 String transactionChainId, short clientVersion) {
542 ShardTransactionIdentifier transactionId = new ShardTransactionIdentifier(remoteTransactionId);
544 if(LOG.isDebugEnabled()) {
545 LOG.debug("{}: Creating transaction : {} ", persistenceId(), transactionId);
548 ActorRef transactionActor = createTypedTransactionActor(transactionType, transactionId,
549 transactionChainId, clientVersion);
551 return transactionActor;
554 private void commitWithNewTransaction(final Modification modification) {
555 ReadWriteShardDataTreeTransaction tx = store.newReadWriteTransaction(modification.toString(), null);
556 modification.apply(tx.getSnapshot());
558 snapshotCohort.syncCommitTransaction(tx);
559 shardMBean.incrementCommittedTransactionCount();
560 shardMBean.setLastCommittedTransactionTime(System.currentTimeMillis());
561 } catch (Exception e) {
562 shardMBean.incrementFailedTransactionsCount();
563 LOG.error("{}: Failed to commit", persistenceId(), e);
567 private void updateSchemaContext(final UpdateSchemaContext message) {
568 updateSchemaContext(message.getSchemaContext());
572 void updateSchemaContext(final SchemaContext schemaContext) {
573 store.updateSchemaContext(schemaContext);
576 private boolean isMetricsCaptureEnabled() {
577 CommonConfig config = new CommonConfig(getContext().system().settings().config());
578 return config.isMetricCaptureEnabled();
583 public RaftActorSnapshotCohort getRaftActorSnapshotCohort() {
584 return snapshotCohort;
589 protected RaftActorRecoveryCohort getRaftActorRecoveryCohort() {
590 return new ShardRecoveryCoordinator(store, store.getSchemaContext(), persistenceId(), LOG);
594 protected void onRecoveryComplete() {
595 //notify shard manager
596 getContext().parent().tell(new ActorInitialized(), getSelf());
598 // Being paranoid here - this method should only be called once but just in case...
599 if(txCommitTimeoutCheckSchedule == null) {
600 // Schedule a message to be periodically sent to check if the current in-progress
601 // transaction should be expired and aborted.
602 FiniteDuration period = Duration.create(transactionCommitTimeout / 3, TimeUnit.MILLISECONDS);
603 txCommitTimeoutCheckSchedule = getContext().system().scheduler().schedule(
604 period, period, getSelf(),
605 TX_COMMIT_TIMEOUT_CHECK_MESSAGE, getContext().dispatcher(), ActorRef.noSender());
610 protected void applyState(final ActorRef clientActor, final String identifier, final Object data) {
611 if (data instanceof DataTreeCandidatePayload) {
612 if (clientActor == null) {
613 // No clientActor indicates a replica coming from the leader
615 store.applyForeignCandidate(identifier, ((DataTreeCandidatePayload)data).getCandidate());
616 } catch (DataValidationFailedException | IOException e) {
617 LOG.error("{}: Error applying replica {}", persistenceId(), identifier, e);
620 // Replication consensus reached, proceed to commit
621 finishCommit(clientActor, identifier);
623 } else if (data instanceof ModificationPayload) {
625 applyModificationToState(clientActor, identifier, ((ModificationPayload) data).getModification());
626 } catch (ClassNotFoundException | IOException e) {
627 LOG.error("{}: Error extracting ModificationPayload", persistenceId(), e);
629 } else if (data instanceof CompositeModificationPayload) {
630 Object modification = ((CompositeModificationPayload) data).getModification();
632 applyModificationToState(clientActor, identifier, modification);
633 } else if(data instanceof CompositeModificationByteStringPayload ){
634 Object modification = ((CompositeModificationByteStringPayload) data).getModification();
636 applyModificationToState(clientActor, identifier, modification);
638 LOG.error("{}: Unknown state received {} Class loader = {} CompositeNodeMod.ClassLoader = {}",
639 persistenceId(), data, data.getClass().getClassLoader(),
640 CompositeModificationPayload.class.getClassLoader());
644 private void applyModificationToState(ActorRef clientActor, String identifier, Object modification) {
645 if(modification == null) {
647 "{}: modification is null - this is very unexpected, clientActor = {}, identifier = {}",
648 persistenceId(), identifier, clientActor != null ? clientActor.path().toString() : null);
649 } else if(clientActor == null) {
650 // There's no clientActor to which to send a commit reply so we must be applying
651 // replicated state from the leader.
652 commitWithNewTransaction(MutableCompositeModification.fromSerializable(modification));
654 // This must be the OK to commit after replication consensus.
655 finishCommit(clientActor, identifier);
660 protected void onStateChanged() {
661 boolean isLeader = isLeader();
662 boolean hasLeader = hasLeader();
663 changeSupport.onLeadershipChange(isLeader, hasLeader);
664 treeChangeSupport.onLeadershipChange(isLeader, hasLeader);
666 // If this actor is no longer the leader close all the transaction chains
668 if(LOG.isDebugEnabled()) {
670 "{}: onStateChanged: Closing all transaction chains because shard {} is no longer the leader",
671 persistenceId(), getId());
674 store.closeAllTransactionChains();
679 protected void onLeaderChanged(String oldLeader, String newLeader) {
680 shardMBean.incrementLeadershipChangeCount();
684 public String persistenceId() {
689 ShardCommitCoordinator getCommitCoordinator() {
690 return commitCoordinator;
694 private static class ShardCreator implements Creator<Shard> {
696 private static final long serialVersionUID = 1L;
698 final ShardIdentifier name;
699 final Map<String, String> peerAddresses;
700 final DatastoreContext datastoreContext;
701 final SchemaContext schemaContext;
703 ShardCreator(final ShardIdentifier name, final Map<String, String> peerAddresses,
704 final DatastoreContext datastoreContext, final SchemaContext schemaContext) {
706 this.peerAddresses = peerAddresses;
707 this.datastoreContext = datastoreContext;
708 this.schemaContext = schemaContext;
712 public Shard create() throws Exception {
713 return new Shard(name, peerAddresses, datastoreContext, schemaContext);
718 public ShardDataTree getDataStore() {
723 ShardStats getShardMBean() {