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.actor.Status;
16 import akka.actor.Status.Failure;
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 com.google.common.base.Ticker;
22 import com.google.common.base.Verify;
23 import com.google.common.collect.ImmutableList;
24 import com.google.common.collect.ImmutableMap;
25 import com.google.common.collect.Range;
26 import java.io.IOException;
27 import java.util.Arrays;
28 import java.util.Collection;
29 import java.util.Collections;
31 import java.util.concurrent.TimeUnit;
32 import javax.annotation.Nonnull;
33 import javax.annotation.Nullable;
34 import org.opendaylight.controller.cluster.access.ABIVersion;
35 import org.opendaylight.controller.cluster.access.commands.ConnectClientRequest;
36 import org.opendaylight.controller.cluster.access.commands.ConnectClientSuccess;
37 import org.opendaylight.controller.cluster.access.commands.LocalHistoryRequest;
38 import org.opendaylight.controller.cluster.access.commands.NotLeaderException;
39 import org.opendaylight.controller.cluster.access.commands.OutOfSequenceEnvelopeException;
40 import org.opendaylight.controller.cluster.access.commands.TransactionRequest;
41 import org.opendaylight.controller.cluster.access.concepts.ClientIdentifier;
42 import org.opendaylight.controller.cluster.access.concepts.FrontendIdentifier;
43 import org.opendaylight.controller.cluster.access.concepts.LocalHistoryIdentifier;
44 import org.opendaylight.controller.cluster.access.concepts.Request;
45 import org.opendaylight.controller.cluster.access.concepts.RequestEnvelope;
46 import org.opendaylight.controller.cluster.access.concepts.RequestException;
47 import org.opendaylight.controller.cluster.access.concepts.RequestSuccess;
48 import org.opendaylight.controller.cluster.access.concepts.RetiredGenerationException;
49 import org.opendaylight.controller.cluster.access.concepts.RuntimeRequestException;
50 import org.opendaylight.controller.cluster.access.concepts.SliceableMessage;
51 import org.opendaylight.controller.cluster.access.concepts.TransactionIdentifier;
52 import org.opendaylight.controller.cluster.access.concepts.UnsupportedRequestException;
53 import org.opendaylight.controller.cluster.common.actor.CommonConfig;
54 import org.opendaylight.controller.cluster.common.actor.Dispatchers;
55 import org.opendaylight.controller.cluster.common.actor.Dispatchers.DispatcherType;
56 import org.opendaylight.controller.cluster.common.actor.MessageTracker;
57 import org.opendaylight.controller.cluster.common.actor.MessageTracker.Error;
58 import org.opendaylight.controller.cluster.common.actor.MeteringBehavior;
59 import org.opendaylight.controller.cluster.datastore.exceptions.NoShardLeaderException;
60 import org.opendaylight.controller.cluster.datastore.identifiers.ShardIdentifier;
61 import org.opendaylight.controller.cluster.datastore.jmx.mbeans.shard.ShardMBeanFactory;
62 import org.opendaylight.controller.cluster.datastore.jmx.mbeans.shard.ShardStats;
63 import org.opendaylight.controller.cluster.datastore.messages.AbortTransaction;
64 import org.opendaylight.controller.cluster.datastore.messages.ActorInitialized;
65 import org.opendaylight.controller.cluster.datastore.messages.BatchedModifications;
66 import org.opendaylight.controller.cluster.datastore.messages.CanCommitTransaction;
67 import org.opendaylight.controller.cluster.datastore.messages.CloseTransactionChain;
68 import org.opendaylight.controller.cluster.datastore.messages.CommitTransaction;
69 import org.opendaylight.controller.cluster.datastore.messages.CreateTransaction;
70 import org.opendaylight.controller.cluster.datastore.messages.CreateTransactionReply;
71 import org.opendaylight.controller.cluster.datastore.messages.ForwardedReadyTransaction;
72 import org.opendaylight.controller.cluster.datastore.messages.GetShardDataTree;
73 import org.opendaylight.controller.cluster.datastore.messages.MakeLeaderLocal;
74 import org.opendaylight.controller.cluster.datastore.messages.OnDemandShardState;
75 import org.opendaylight.controller.cluster.datastore.messages.PeerAddressResolved;
76 import org.opendaylight.controller.cluster.datastore.messages.PersistAbortTransactionPayload;
77 import org.opendaylight.controller.cluster.datastore.messages.ReadyLocalTransaction;
78 import org.opendaylight.controller.cluster.datastore.messages.RegisterChangeListener;
79 import org.opendaylight.controller.cluster.datastore.messages.RegisterDataTreeChangeListener;
80 import org.opendaylight.controller.cluster.datastore.messages.ShardLeaderStateChanged;
81 import org.opendaylight.controller.cluster.datastore.messages.UpdateSchemaContext;
82 import org.opendaylight.controller.cluster.datastore.persisted.AbortTransactionPayload;
83 import org.opendaylight.controller.cluster.datastore.persisted.DatastoreSnapshot;
84 import org.opendaylight.controller.cluster.datastore.persisted.DatastoreSnapshot.ShardSnapshot;
85 import org.opendaylight.controller.cluster.messaging.MessageSlicer;
86 import org.opendaylight.controller.cluster.messaging.SliceOptions;
87 import org.opendaylight.controller.cluster.notifications.LeaderStateChanged;
88 import org.opendaylight.controller.cluster.notifications.RegisterRoleChangeListener;
89 import org.opendaylight.controller.cluster.notifications.RoleChangeNotifier;
90 import org.opendaylight.controller.cluster.raft.LeadershipTransferFailedException;
91 import org.opendaylight.controller.cluster.raft.RaftActor;
92 import org.opendaylight.controller.cluster.raft.RaftActorRecoveryCohort;
93 import org.opendaylight.controller.cluster.raft.RaftActorSnapshotCohort;
94 import org.opendaylight.controller.cluster.raft.RaftState;
95 import org.opendaylight.controller.cluster.raft.base.messages.FollowerInitialSyncUpStatus;
96 import org.opendaylight.controller.cluster.raft.client.messages.OnDemandRaftState;
97 import org.opendaylight.controller.cluster.raft.messages.AppendEntriesReply;
98 import org.opendaylight.controller.cluster.raft.messages.RequestLeadership;
99 import org.opendaylight.controller.cluster.raft.messages.ServerRemoved;
100 import org.opendaylight.controller.cluster.raft.protobuff.client.messages.Payload;
101 import org.opendaylight.yangtools.concepts.Identifier;
102 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataValidationFailedException;
103 import org.opendaylight.yangtools.yang.data.api.schema.tree.TipProducingDataTree;
104 import org.opendaylight.yangtools.yang.data.api.schema.tree.TreeType;
105 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
106 import org.opendaylight.yangtools.yang.model.api.SchemaContextProvider;
107 import scala.concurrent.duration.Duration;
108 import scala.concurrent.duration.FiniteDuration;
111 * A Shard represents a portion of the logical data tree.
114 * Our Shard uses InMemoryDataTree as it's internal representation and delegates all requests it
116 public class Shard extends RaftActor {
119 static final Object TX_COMMIT_TIMEOUT_CHECK_MESSAGE = new Object() {
121 public String toString() {
122 return "txCommitTimeoutCheck";
127 static final Object GET_SHARD_MBEAN_MESSAGE = new Object() {
129 public String toString() {
130 return "getShardMBeanMessage";
134 static final Object RESUME_NEXT_PENDING_TRANSACTION = new Object() {
136 public String toString() {
137 return "resumeNextPendingTransaction";
141 // FIXME: shard names should be encapsulated in their own class and this should be exposed as a constant.
142 public static final String DEFAULT_NAME = "default";
144 private static final Collection<ABIVersion> SUPPORTED_ABIVERSIONS;
147 final ABIVersion[] values = ABIVersion.values();
148 final ABIVersion[] real = Arrays.copyOfRange(values, 1, values.length - 1);
149 SUPPORTED_ABIVERSIONS = ImmutableList.copyOf(real).reverse();
152 // FIXME: make this a dynamic property based on mailbox size and maximum number of clients
153 private static final int CLIENT_MAX_MESSAGES = 1000;
155 // The state of this Shard
156 private final ShardDataTree store;
158 /// The name of this shard
159 private final String name;
161 private final ShardStats shardMBean;
163 private DatastoreContext datastoreContext;
165 private final ShardCommitCoordinator commitCoordinator;
167 private long transactionCommitTimeout;
169 private Cancellable txCommitTimeoutCheckSchedule;
171 private final Optional<ActorRef> roleChangeNotifier;
173 private final MessageTracker appendEntriesReplyTracker;
175 private final ShardTransactionActorFactory transactionActorFactory;
177 private final ShardSnapshotCohort snapshotCohort;
179 private final DataTreeChangeListenerSupport treeChangeSupport = new DataTreeChangeListenerSupport(this);
180 private final DataChangeListenerSupport changeSupport = new DataChangeListenerSupport(this);
183 private ShardSnapshot restoreFromSnapshot;
185 private final ShardTransactionMessageRetrySupport messageRetrySupport;
187 private final FrontendMetadata frontendMetadata;
188 private Map<FrontendIdentifier, LeaderFrontendState> knownFrontends = ImmutableMap.of();
189 private boolean paused;
191 private final MessageSlicer responseMessageSlicer;
192 private final Dispatchers dispatchers;
194 protected Shard(final AbstractBuilder<?, ?> builder) {
195 super(builder.getId().toString(), builder.getPeerAddresses(),
196 Optional.of(builder.getDatastoreContext().getShardRaftConfig()), DataStoreVersions.CURRENT_VERSION);
198 this.name = builder.getId().toString();
199 this.datastoreContext = builder.getDatastoreContext();
200 this.restoreFromSnapshot = builder.getRestoreFromSnapshot();
201 this.frontendMetadata = new FrontendMetadata(name);
203 setPersistence(datastoreContext.isPersistent());
205 LOG.info("Shard created : {}, persistent : {}", name, datastoreContext.isPersistent());
207 ShardDataTreeChangeListenerPublisherActorProxy treeChangeListenerPublisher =
208 new ShardDataTreeChangeListenerPublisherActorProxy(getContext(), name + "-DTCL-publisher", name);
209 ShardDataChangeListenerPublisherActorProxy dataChangeListenerPublisher =
210 new ShardDataChangeListenerPublisherActorProxy(getContext(), name + "-DCL-publisher", name);
211 if (builder.getDataTree() != null) {
212 store = new ShardDataTree(this, builder.getSchemaContext(), builder.getDataTree(),
213 treeChangeListenerPublisher, dataChangeListenerPublisher, name, frontendMetadata);
215 store = new ShardDataTree(this, builder.getSchemaContext(), builder.getTreeType(),
216 builder.getDatastoreContext().getStoreRoot(), treeChangeListenerPublisher,
217 dataChangeListenerPublisher, name, frontendMetadata);
220 shardMBean = ShardMBeanFactory.getShardStatsMBean(name, datastoreContext.getDataStoreMXBeanType(), this);
222 if (isMetricsCaptureEnabled()) {
223 getContext().become(new MeteringBehavior(this));
226 commitCoordinator = new ShardCommitCoordinator(store, LOG, this.name);
228 setTransactionCommitTimeout();
230 // create a notifier actor for each cluster member
231 roleChangeNotifier = createRoleChangeNotifier(name);
233 appendEntriesReplyTracker = new MessageTracker(AppendEntriesReply.class,
234 getRaftActorContext().getConfigParams().getIsolatedCheckIntervalInMillis());
236 dispatchers = new Dispatchers(context().system().dispatchers());
237 transactionActorFactory = new ShardTransactionActorFactory(store, datastoreContext,
238 dispatchers.getDispatcherPath(Dispatchers.DispatcherType.Transaction),
239 self(), getContext(), shardMBean, builder.getId().getShardName());
241 snapshotCohort = ShardSnapshotCohort.create(getContext(), builder.getId().getMemberName(), store, LOG,
244 messageRetrySupport = new ShardTransactionMessageRetrySupport(this);
246 responseMessageSlicer = MessageSlicer.builder().logContext(this.name)
247 .messageSliceSize(datastoreContext.getMaximumMessageSliceSize())
248 .fileBackedStreamFactory(getRaftActorContext().getFileBackedOutputStreamFactory())
249 .expireStateAfterInactivity(2, TimeUnit.MINUTES).build();
252 private void setTransactionCommitTimeout() {
253 transactionCommitTimeout = TimeUnit.MILLISECONDS.convert(
254 datastoreContext.getShardTransactionCommitTimeoutInSeconds(), TimeUnit.SECONDS) / 2;
257 private Optional<ActorRef> createRoleChangeNotifier(final String shardId) {
258 ActorRef shardRoleChangeNotifier = this.getContext().actorOf(
259 RoleChangeNotifier.getProps(shardId), shardId + "-notifier");
260 return Optional.of(shardRoleChangeNotifier);
264 public void postStop() {
265 LOG.info("Stopping Shard {}", persistenceId());
269 messageRetrySupport.close();
271 if (txCommitTimeoutCheckSchedule != null) {
272 txCommitTimeoutCheckSchedule.cancel();
275 commitCoordinator.abortPendingTransactions("Transaction aborted due to shutdown.", this);
277 shardMBean.unregisterMBean();
281 protected void handleRecover(final Object message) {
282 LOG.debug("{}: onReceiveRecover: Received message {} from {}", persistenceId(), message.getClass(),
285 super.handleRecover(message);
286 if (LOG.isTraceEnabled()) {
287 appendEntriesReplyTracker.begin();
292 protected void handleNonRaftCommand(final Object message) {
293 try (MessageTracker.Context context = appendEntriesReplyTracker.received(message)) {
294 final Optional<Error> maybeError = context.error();
295 if (maybeError.isPresent()) {
296 LOG.trace("{} : AppendEntriesReply failed to arrive at the expected interval {}", persistenceId(),
300 store.resetTransactionBatch();
302 if (message instanceof RequestEnvelope) {
303 handleRequestEnvelope((RequestEnvelope)message);
304 } else if (message instanceof ConnectClientRequest) {
305 handleConnectClient((ConnectClientRequest)message);
306 } else if (CreateTransaction.isSerializedType(message)) {
307 handleCreateTransaction(message);
308 } else if (message instanceof BatchedModifications) {
309 handleBatchedModifications((BatchedModifications)message);
310 } else if (message instanceof ForwardedReadyTransaction) {
311 handleForwardedReadyTransaction((ForwardedReadyTransaction) message);
312 } else if (message instanceof ReadyLocalTransaction) {
313 handleReadyLocalTransaction((ReadyLocalTransaction)message);
314 } else if (CanCommitTransaction.isSerializedType(message)) {
315 handleCanCommitTransaction(CanCommitTransaction.fromSerializable(message));
316 } else if (CommitTransaction.isSerializedType(message)) {
317 handleCommitTransaction(CommitTransaction.fromSerializable(message));
318 } else if (AbortTransaction.isSerializedType(message)) {
319 handleAbortTransaction(AbortTransaction.fromSerializable(message));
320 } else if (CloseTransactionChain.isSerializedType(message)) {
321 closeTransactionChain(CloseTransactionChain.fromSerializable(message));
322 } else if (message instanceof RegisterChangeListener) {
323 changeSupport.onMessage((RegisterChangeListener) message, isLeader(), hasLeader());
324 } else if (message instanceof RegisterDataTreeChangeListener) {
325 treeChangeSupport.onMessage((RegisterDataTreeChangeListener) message, isLeader(), hasLeader());
326 } else if (message instanceof UpdateSchemaContext) {
327 updateSchemaContext((UpdateSchemaContext) message);
328 } else if (message instanceof PeerAddressResolved) {
329 PeerAddressResolved resolved = (PeerAddressResolved) message;
330 setPeerAddress(resolved.getPeerId(), resolved.getPeerAddress());
331 } else if (TX_COMMIT_TIMEOUT_CHECK_MESSAGE.equals(message)) {
332 store.checkForExpiredTransactions(transactionCommitTimeout);
333 commitCoordinator.checkForExpiredTransactions(transactionCommitTimeout, this);
334 } else if (message instanceof DatastoreContext) {
335 onDatastoreContext((DatastoreContext)message);
336 } else if (message instanceof RegisterRoleChangeListener) {
337 roleChangeNotifier.get().forward(message, context());
338 } else if (message instanceof FollowerInitialSyncUpStatus) {
339 shardMBean.setFollowerInitialSyncStatus(((FollowerInitialSyncUpStatus) message).isInitialSyncDone());
340 context().parent().tell(message, self());
341 } else if (GET_SHARD_MBEAN_MESSAGE.equals(message)) {
342 sender().tell(getShardMBean(), self());
343 } else if (message instanceof GetShardDataTree) {
344 sender().tell(store.getDataTree(), self());
345 } else if (message instanceof ServerRemoved) {
346 context().parent().forward(message, context());
347 } else if (ShardTransactionMessageRetrySupport.TIMER_MESSAGE_CLASS.isInstance(message)) {
348 messageRetrySupport.onTimerMessage(message);
349 } else if (message instanceof DataTreeCohortActorRegistry.CohortRegistryCommand) {
350 store.processCohortRegistryCommand(getSender(),
351 (DataTreeCohortActorRegistry.CohortRegistryCommand) message);
352 } else if (message instanceof PersistAbortTransactionPayload) {
353 final TransactionIdentifier txId = ((PersistAbortTransactionPayload) message).getTransactionId();
354 persistPayload(txId, AbortTransactionPayload.create(txId), true);
355 } else if (message instanceof MakeLeaderLocal) {
357 } else if (RESUME_NEXT_PENDING_TRANSACTION.equals(message)) {
358 store.resumeNextPendingTransaction();
359 } else if (!responseMessageSlicer.handleMessage(message)) {
360 super.handleNonRaftCommand(message);
365 @SuppressWarnings("checkstyle:IllegalCatch")
366 private void handleRequestEnvelope(final RequestEnvelope envelope) {
367 final long now = ticker().read();
369 final RequestSuccess<?, ?> success = handleRequest(envelope, now);
370 if (success != null) {
371 final long executionTimeNanos = ticker().read() - now;
372 if (success instanceof SliceableMessage) {
373 dispatchers.getDispatcher(DispatcherType.Serialization).execute(() ->
374 responseMessageSlicer.slice(SliceOptions.builder().identifier(success.getTarget())
375 .message(envelope.newSuccessEnvelope(success, executionTimeNanos))
376 .sendTo(envelope.getMessage().getReplyTo()).replyTo(self())
377 .onFailureCallback(t -> {
378 LOG.warn("Error slicing response {}", success, t);
381 envelope.sendSuccess(success, executionTimeNanos);
384 } catch (RequestException e) {
385 LOG.debug("{}: request {} failed", persistenceId(), envelope, e);
386 envelope.sendFailure(e, ticker().read() - now);
387 } catch (Exception e) {
388 LOG.debug("{}: request {} caused failure", persistenceId(), envelope, e);
389 envelope.sendFailure(new RuntimeRequestException("Request failed to process", e),
390 ticker().read() - now);
394 private void onMakeLeaderLocal() {
395 LOG.debug("{}: onMakeLeaderLocal received", persistenceId());
397 getSender().tell(new Status.Success(null), getSelf());
401 final ActorSelection leader = getLeader();
403 if (leader == null) {
404 // Leader is not present. The cluster is most likely trying to
405 // elect a leader and we should let that run its normal course
407 // TODO we can wait for the election to complete and retry the
408 // request. We can also let the caller retry by sending a flag
409 // in the response indicating the request is "reTryable".
410 getSender().tell(new Failure(
411 new LeadershipTransferFailedException("We cannot initiate leadership transfer to local node. "
412 + "Currently there is no leader for " + persistenceId())),
417 leader.tell(new RequestLeadership(getId(), getSender()), getSelf());
420 // Acquire our frontend tracking handle and verify generation matches
422 private LeaderFrontendState findFrontend(final ClientIdentifier clientId) throws RequestException {
423 final LeaderFrontendState existing = knownFrontends.get(clientId.getFrontendId());
424 if (existing != null) {
425 final int cmp = Long.compareUnsigned(existing.getIdentifier().getGeneration(), clientId.getGeneration());
431 LOG.debug("{}: rejecting request from outdated client {}", persistenceId(), clientId);
432 throw new RetiredGenerationException(existing.getIdentifier().getGeneration());
435 LOG.info("{}: retiring state {}, outdated by request from client {}", persistenceId(), existing, clientId);
437 knownFrontends.remove(clientId.getFrontendId());
439 LOG.debug("{}: client {} is not yet known", persistenceId(), clientId);
445 private LeaderFrontendState getFrontend(final ClientIdentifier clientId) throws RequestException {
446 final LeaderFrontendState ret = findFrontend(clientId);
451 // TODO: a dedicated exception would be better, but this is technically true, too
452 throw new OutOfSequenceEnvelopeException(0);
455 private static @Nonnull ABIVersion selectVersion(final ConnectClientRequest message) {
456 final Range<ABIVersion> clientRange = Range.closed(message.getMinVersion(), message.getMaxVersion());
457 for (ABIVersion v : SUPPORTED_ABIVERSIONS) {
458 if (clientRange.contains(v)) {
463 throw new IllegalArgumentException(String.format(
464 "No common version between backend versions %s and client versions %s", SUPPORTED_ABIVERSIONS,
468 @SuppressWarnings("checkstyle:IllegalCatch")
469 private void handleConnectClient(final ConnectClientRequest message) {
471 final ClientIdentifier clientId = message.getTarget();
472 final LeaderFrontendState existing = findFrontend(clientId);
473 if (existing != null) {
477 if (!isLeader() || !isLeaderActive()) {
478 LOG.info("{}: not currently leader, rejecting request {}. isLeader: {}, isLeaderActive: {},"
479 + "isLeadershipTransferInProgress: {}.",
480 persistenceId(), message, isLeader(), isLeaderActive(), isLeadershipTransferInProgress());
481 throw new NotLeaderException(getSelf());
484 final ABIVersion selectedVersion = selectVersion(message);
485 final LeaderFrontendState frontend;
486 if (existing == null) {
487 frontend = new LeaderFrontendState(persistenceId(), clientId, store);
488 knownFrontends.put(clientId.getFrontendId(), frontend);
489 LOG.debug("{}: created state {} for client {}", persistenceId(), frontend, clientId);
494 frontend.reconnect();
495 message.getReplyTo().tell(new ConnectClientSuccess(message.getTarget(), message.getSequence(), getSelf(),
496 ImmutableList.of(), store.getDataTree(), CLIENT_MAX_MESSAGES).toVersion(selectedVersion),
497 ActorRef.noSender());
498 } catch (RequestException | RuntimeException e) {
499 message.getReplyTo().tell(new Failure(e), ActorRef.noSender());
503 private @Nullable RequestSuccess<?, ?> handleRequest(final RequestEnvelope envelope, final long now)
504 throws RequestException {
505 // We are not the leader, hence we want to fail-fast.
506 if (!isLeader() || paused || !isLeaderActive()) {
507 LOG.debug("{}: not currently active leader, rejecting request {}. isLeader: {}, isLeaderActive: {},"
508 + "isLeadershipTransferInProgress: {}, paused: {}",
509 persistenceId(), envelope, isLeader(), isLeaderActive(), isLeadershipTransferInProgress(), paused);
510 throw new NotLeaderException(getSelf());
513 final Request<?, ?> request = envelope.getMessage();
514 if (request instanceof TransactionRequest) {
515 final TransactionRequest<?> txReq = (TransactionRequest<?>)request;
516 final ClientIdentifier clientId = txReq.getTarget().getHistoryId().getClientId();
517 return getFrontend(clientId).handleTransactionRequest(txReq, envelope, now);
518 } else if (request instanceof LocalHistoryRequest) {
519 final LocalHistoryRequest<?> lhReq = (LocalHistoryRequest<?>)request;
520 final ClientIdentifier clientId = lhReq.getTarget().getClientId();
521 return getFrontend(clientId).handleLocalHistoryRequest(lhReq, envelope, now);
523 LOG.warn("{}: rejecting unsupported request {}", persistenceId(), request);
524 throw new UnsupportedRequestException(request);
528 private boolean hasLeader() {
529 return getLeaderId() != null;
532 public int getPendingTxCommitQueueSize() {
533 return store.getQueueSize();
536 public int getCohortCacheSize() {
537 return commitCoordinator.getCohortCacheSize();
541 protected Optional<ActorRef> getRoleChangeNotifier() {
542 return roleChangeNotifier;
546 protected LeaderStateChanged newLeaderStateChanged(final String memberId, final String leaderId,
547 final short leaderPayloadVersion) {
548 return isLeader() ? new ShardLeaderStateChanged(memberId, leaderId, store.getDataTree(), leaderPayloadVersion)
549 : new ShardLeaderStateChanged(memberId, leaderId, leaderPayloadVersion);
552 protected void onDatastoreContext(final DatastoreContext context) {
553 datastoreContext = context;
555 setTransactionCommitTimeout();
557 setPersistence(datastoreContext.isPersistent());
559 updateConfigParams(datastoreContext.getShardRaftConfig());
562 // applyState() will be invoked once consensus is reached on the payload
563 void persistPayload(final Identifier id, final Payload payload, final boolean batchHint) {
564 boolean canSkipPayload = !hasFollowers() && !persistence().isRecoveryApplicable();
565 if (canSkipPayload) {
566 applyState(self(), id, payload);
568 // We are faking the sender
569 persistData(self(), id, payload, batchHint);
573 private void handleCommitTransaction(final CommitTransaction commit) {
575 commitCoordinator.handleCommit(commit.getTransactionId(), getSender(), this);
577 ActorSelection leader = getLeader();
578 if (leader == null) {
579 messageRetrySupport.addMessageToRetry(commit, getSender(),
580 "Could not commit transaction " + commit.getTransactionId());
582 LOG.debug("{}: Forwarding CommitTransaction to leader {}", persistenceId(), leader);
583 leader.forward(commit, getContext());
588 private void handleCanCommitTransaction(final CanCommitTransaction canCommit) {
589 LOG.debug("{}: Can committing transaction {}", persistenceId(), canCommit.getTransactionId());
592 commitCoordinator.handleCanCommit(canCommit.getTransactionId(), getSender(), this);
594 ActorSelection leader = getLeader();
595 if (leader == null) {
596 messageRetrySupport.addMessageToRetry(canCommit, getSender(),
597 "Could not canCommit transaction " + canCommit.getTransactionId());
599 LOG.debug("{}: Forwarding CanCommitTransaction to leader {}", persistenceId(), leader);
600 leader.forward(canCommit, getContext());
605 @SuppressWarnings("checkstyle:IllegalCatch")
606 protected void handleBatchedModificationsLocal(final BatchedModifications batched, final ActorRef sender) {
608 commitCoordinator.handleBatchedModifications(batched, sender, this);
609 } catch (Exception e) {
610 LOG.error("{}: Error handling BatchedModifications for Tx {}", persistenceId(),
611 batched.getTransactionId(), e);
612 sender.tell(new Failure(e), getSelf());
616 private void handleBatchedModifications(final BatchedModifications batched) {
617 // This message is sent to prepare the modifications transaction directly on the Shard as an
618 // optimization to avoid the extra overhead of a separate ShardTransaction actor. On the last
619 // BatchedModifications message, the caller sets the ready flag in the message indicating
620 // modifications are complete. The reply contains the cohort actor path (this actor) for the caller
621 // to initiate the 3-phase commit. This also avoids the overhead of sending an additional
622 // ReadyTransaction message.
624 // If we're not the leader then forward to the leader. This is a safety measure - we shouldn't
625 // normally get here if we're not the leader as the front-end (TransactionProxy) should determine
626 // the primary/leader shard. However with timing and caching on the front-end, there's a small
627 // window where it could have a stale leader during leadership transitions.
629 boolean isLeaderActive = isLeaderActive();
630 if (isLeader() && isLeaderActive) {
631 handleBatchedModificationsLocal(batched, getSender());
633 ActorSelection leader = getLeader();
634 if (!isLeaderActive || leader == null) {
635 messageRetrySupport.addMessageToRetry(batched, getSender(),
636 "Could not commit transaction " + batched.getTransactionId());
638 // If this is not the first batch and leadership changed in between batched messages,
639 // we need to reconstruct previous BatchedModifications from the transaction
640 // DataTreeModification, honoring the max batched modification count, and forward all the
641 // previous BatchedModifications to the new leader.
642 Collection<BatchedModifications> newModifications = commitCoordinator
643 .createForwardedBatchedModifications(batched,
644 datastoreContext.getShardBatchedModificationCount());
646 LOG.debug("{}: Forwarding {} BatchedModifications to leader {}", persistenceId(),
647 newModifications.size(), leader);
649 for (BatchedModifications bm : newModifications) {
650 leader.forward(bm, getContext());
656 private boolean failIfIsolatedLeader(final ActorRef sender) {
657 if (isIsolatedLeader()) {
658 sender.tell(new Failure(new NoShardLeaderException(String.format(
659 "Shard %s was the leader but has lost contact with all of its followers. Either all"
660 + " other follower nodes are down or this node is isolated by a network partition.",
661 persistenceId()))), getSelf());
668 protected boolean isIsolatedLeader() {
669 return getRaftState() == RaftState.IsolatedLeader;
672 @SuppressWarnings("checkstyle:IllegalCatch")
673 private void handleReadyLocalTransaction(final ReadyLocalTransaction message) {
674 LOG.debug("{}: handleReadyLocalTransaction for {}", persistenceId(), message.getTransactionId());
676 boolean isLeaderActive = isLeaderActive();
677 if (isLeader() && isLeaderActive) {
679 commitCoordinator.handleReadyLocalTransaction(message, getSender(), this);
680 } catch (Exception e) {
681 LOG.error("{}: Error handling ReadyLocalTransaction for Tx {}", persistenceId(),
682 message.getTransactionId(), e);
683 getSender().tell(new Failure(e), getSelf());
686 ActorSelection leader = getLeader();
687 if (!isLeaderActive || leader == null) {
688 messageRetrySupport.addMessageToRetry(message, getSender(),
689 "Could not commit transaction " + message.getTransactionId());
691 LOG.debug("{}: Forwarding ReadyLocalTransaction to leader {}", persistenceId(), leader);
692 message.setRemoteVersion(getCurrentBehavior().getLeaderPayloadVersion());
693 leader.forward(message, getContext());
698 private void handleForwardedReadyTransaction(final ForwardedReadyTransaction forwardedReady) {
699 LOG.debug("{}: handleForwardedReadyTransaction for {}", persistenceId(), forwardedReady.getTransactionId());
701 boolean isLeaderActive = isLeaderActive();
702 if (isLeader() && isLeaderActive) {
703 commitCoordinator.handleForwardedReadyTransaction(forwardedReady, getSender(), this);
705 ActorSelection leader = getLeader();
706 if (!isLeaderActive || leader == null) {
707 messageRetrySupport.addMessageToRetry(forwardedReady, getSender(),
708 "Could not commit transaction " + forwardedReady.getTransactionId());
710 LOG.debug("{}: Forwarding ForwardedReadyTransaction to leader {}", persistenceId(), leader);
712 ReadyLocalTransaction readyLocal = new ReadyLocalTransaction(forwardedReady.getTransactionId(),
713 forwardedReady.getTransaction().getSnapshot(), forwardedReady.isDoImmediateCommit());
714 readyLocal.setRemoteVersion(getCurrentBehavior().getLeaderPayloadVersion());
715 leader.forward(readyLocal, getContext());
720 private void handleAbortTransaction(final AbortTransaction abort) {
721 doAbortTransaction(abort.getTransactionId(), getSender());
724 void doAbortTransaction(final Identifier transactionID, final ActorRef sender) {
725 commitCoordinator.handleAbort(transactionID, sender, this);
728 private void handleCreateTransaction(final Object message) {
730 createTransaction(CreateTransaction.fromSerializable(message));
731 } else if (getLeader() != null) {
732 getLeader().forward(message, getContext());
734 getSender().tell(new Failure(new NoShardLeaderException(
735 "Could not create a shard transaction", persistenceId())), getSelf());
739 private void closeTransactionChain(final CloseTransactionChain closeTransactionChain) {
740 final LocalHistoryIdentifier id = closeTransactionChain.getIdentifier();
741 store.closeTransactionChain(id, null);
742 store.purgeTransactionChain(id, null);
745 @SuppressWarnings("checkstyle:IllegalCatch")
746 private void createTransaction(final CreateTransaction createTransaction) {
748 if (TransactionType.fromInt(createTransaction.getTransactionType()) != TransactionType.READ_ONLY
749 && failIfIsolatedLeader(getSender())) {
753 ActorRef transactionActor = createTransaction(createTransaction.getTransactionType(),
754 createTransaction.getTransactionId());
756 getSender().tell(new CreateTransactionReply(Serialization.serializedActorPath(transactionActor),
757 createTransaction.getTransactionId(), createTransaction.getVersion()).toSerializable(), getSelf());
758 } catch (Exception e) {
759 getSender().tell(new Failure(e), getSelf());
763 private ActorRef createTransaction(final int transactionType, final TransactionIdentifier transactionId) {
764 LOG.debug("{}: Creating transaction : {} ", persistenceId(), transactionId);
765 return transactionActorFactory.newShardTransaction(TransactionType.fromInt(transactionType),
769 private void updateSchemaContext(final UpdateSchemaContext message) {
770 updateSchemaContext(message.getSchemaContext());
774 void updateSchemaContext(final SchemaContext schemaContext) {
775 store.updateSchemaContext(schemaContext);
778 private boolean isMetricsCaptureEnabled() {
779 CommonConfig config = new CommonConfig(getContext().system().settings().config());
780 return config.isMetricCaptureEnabled();
785 public RaftActorSnapshotCohort getRaftActorSnapshotCohort() {
786 return snapshotCohort;
791 protected RaftActorRecoveryCohort getRaftActorRecoveryCohort() {
792 return new ShardRecoveryCoordinator(store,
793 restoreFromSnapshot != null ? restoreFromSnapshot.getSnapshot() : null, persistenceId(), LOG);
797 protected void onRecoveryComplete() {
798 restoreFromSnapshot = null;
800 //notify shard manager
801 getContext().parent().tell(new ActorInitialized(), getSelf());
803 // Being paranoid here - this method should only be called once but just in case...
804 if (txCommitTimeoutCheckSchedule == null) {
805 // Schedule a message to be periodically sent to check if the current in-progress
806 // transaction should be expired and aborted.
807 FiniteDuration period = Duration.create(transactionCommitTimeout / 3, TimeUnit.MILLISECONDS);
808 txCommitTimeoutCheckSchedule = getContext().system().scheduler().schedule(
809 period, period, getSelf(),
810 TX_COMMIT_TIMEOUT_CHECK_MESSAGE, getContext().dispatcher(), ActorRef.noSender());
815 protected void applyState(final ActorRef clientActor, final Identifier identifier, final Object data) {
816 if (data instanceof Payload) {
818 store.applyReplicatedPayload(identifier, (Payload)data);
819 } catch (DataValidationFailedException | IOException e) {
820 LOG.error("{}: Error applying replica {}", persistenceId(), identifier, e);
823 LOG.error("{}: Unknown state for {} received {}", persistenceId(), identifier, data);
828 protected void onStateChanged() {
829 boolean isLeader = isLeader();
830 boolean hasLeader = hasLeader();
831 changeSupport.onLeadershipChange(isLeader, hasLeader);
832 treeChangeSupport.onLeadershipChange(isLeader, hasLeader);
834 // If this actor is no longer the leader close all the transaction chains
836 if (LOG.isDebugEnabled()) {
838 "{}: onStateChanged: Closing all transaction chains because shard {} is no longer the leader",
839 persistenceId(), getId());
843 store.purgeLeaderState();
846 if (hasLeader && !isIsolatedLeader()) {
847 messageRetrySupport.retryMessages();
852 protected void onLeaderChanged(final String oldLeader, final String newLeader) {
853 shardMBean.incrementLeadershipChangeCount();
857 if (!knownFrontends.isEmpty()) {
858 LOG.debug("{}: removing frontend state for {}", persistenceId(), knownFrontends.keySet());
859 knownFrontends = ImmutableMap.of();
863 // No leader anywhere, nothing else to do
867 // Another leader was elected. If we were the previous leader and had pending transactions, convert
868 // them to transaction messages and send to the new leader.
869 ActorSelection leader = getLeader();
870 if (leader != null) {
871 Collection<?> messagesToForward = convertPendingTransactionsToMessages();
873 if (!messagesToForward.isEmpty()) {
874 LOG.debug("{}: Forwarding {} pending transaction messages to leader {}", persistenceId(),
875 messagesToForward.size(), leader);
877 for (Object message : messagesToForward) {
878 leader.tell(message, self());
882 commitCoordinator.abortPendingTransactions("The transacton was aborted due to inflight leadership "
883 + "change and the leader address isn't available.", this);
886 // We have become the leader, we need to reconstruct frontend state
887 knownFrontends = Verify.verifyNotNull(frontendMetadata.toLeaderState(this));
888 LOG.debug("{}: became leader with frontend state for {}", persistenceId(), knownFrontends.keySet());
891 if (!isIsolatedLeader()) {
892 messageRetrySupport.retryMessages();
897 * Clears all pending transactions and converts them to messages to be forwarded to a new leader.
899 * @return the converted messages
901 public Collection<?> convertPendingTransactionsToMessages() {
902 return commitCoordinator.convertPendingTransactionsToMessages(
903 datastoreContext.getShardBatchedModificationCount());
907 protected void pauseLeader(final Runnable operation) {
908 LOG.debug("{}: In pauseLeader, operation: {}", persistenceId(), operation);
911 // Tell-based protocol can replay transaction state, so it is safe to blow it up when we are paused.
912 knownFrontends.values().forEach(LeaderFrontendState::retire);
913 knownFrontends = ImmutableMap.of();
915 store.setRunOnPendingTransactionsComplete(operation);
919 protected void unpauseLeader() {
920 LOG.debug("{}: In unpauseLeader", persistenceId());
923 store.setRunOnPendingTransactionsComplete(null);
925 // Restore tell-based protocol state as if we were becoming the leader
926 knownFrontends = Verify.verifyNotNull(frontendMetadata.toLeaderState(this));
930 protected OnDemandRaftState.AbstractBuilder<?> newOnDemandRaftStateBuilder() {
931 return OnDemandShardState.newBuilder().treeChangeListenerActors(treeChangeSupport.getListenerActors())
932 .dataChangeListenerActors(changeSupport.getListenerActors())
933 .commitCohortActors(store.getCohortActors());
937 public String persistenceId() {
942 ShardCommitCoordinator getCommitCoordinator() {
943 return commitCoordinator;
946 public DatastoreContext getDatastoreContext() {
947 return datastoreContext;
951 public ShardDataTree getDataStore() {
956 ShardStats getShardMBean() {
960 public static Builder builder() {
961 return new Builder();
964 public abstract static class AbstractBuilder<T extends AbstractBuilder<T, S>, S extends Shard> {
965 private final Class<S> shardClass;
966 private ShardIdentifier id;
967 private Map<String, String> peerAddresses = Collections.emptyMap();
968 private DatastoreContext datastoreContext;
969 private SchemaContextProvider schemaContextProvider;
970 private DatastoreSnapshot.ShardSnapshot restoreFromSnapshot;
971 private TipProducingDataTree dataTree;
972 private volatile boolean sealed;
974 protected AbstractBuilder(final Class<S> shardClass) {
975 this.shardClass = shardClass;
978 protected void checkSealed() {
979 Preconditions.checkState(!sealed, "Builder isalready sealed - further modifications are not allowed");
982 @SuppressWarnings("unchecked")
987 public T id(final ShardIdentifier newId) {
993 public T peerAddresses(final Map<String, String> newPeerAddresses) {
995 this.peerAddresses = newPeerAddresses;
999 public T datastoreContext(final DatastoreContext newDatastoreContext) {
1001 this.datastoreContext = newDatastoreContext;
1005 public T schemaContextProvider(final SchemaContextProvider schemaContextProvider) {
1007 this.schemaContextProvider = Preconditions.checkNotNull(schemaContextProvider);
1011 public T restoreFromSnapshot(final DatastoreSnapshot.ShardSnapshot newRestoreFromSnapshot) {
1013 this.restoreFromSnapshot = newRestoreFromSnapshot;
1017 public T dataTree(final TipProducingDataTree newDataTree) {
1019 this.dataTree = newDataTree;
1023 public ShardIdentifier getId() {
1027 public Map<String, String> getPeerAddresses() {
1028 return peerAddresses;
1031 public DatastoreContext getDatastoreContext() {
1032 return datastoreContext;
1035 public SchemaContext getSchemaContext() {
1036 return Verify.verifyNotNull(schemaContextProvider.getSchemaContext());
1039 public DatastoreSnapshot.ShardSnapshot getRestoreFromSnapshot() {
1040 return restoreFromSnapshot;
1043 public TipProducingDataTree getDataTree() {
1047 public TreeType getTreeType() {
1048 switch (datastoreContext.getLogicalStoreType()) {
1050 return TreeType.CONFIGURATION;
1052 return TreeType.OPERATIONAL;
1054 throw new IllegalStateException("Unhandled logical store type "
1055 + datastoreContext.getLogicalStoreType());
1059 protected void verify() {
1060 Preconditions.checkNotNull(id, "id should not be null");
1061 Preconditions.checkNotNull(peerAddresses, "peerAddresses should not be null");
1062 Preconditions.checkNotNull(datastoreContext, "dataStoreContext should not be null");
1063 Preconditions.checkNotNull(schemaContextProvider, "schemaContextProvider should not be null");
1066 public Props props() {
1069 return Props.create(shardClass, this);
1073 public static class Builder extends AbstractBuilder<Builder, Shard> {
1080 return Ticker.systemTicker();
1083 void scheduleNextPendingTransaction() {
1084 self().tell(RESUME_NEXT_PENDING_TRANSACTION, ActorRef.noSender());