X-Git-Url: https://git.opendaylight.org/gerrit/gitweb?p=controller.git;a=blobdiff_plain;f=opendaylight%2Fmd-sal%2Fsal-distributed-datastore%2Fsrc%2Fmain%2Fjava%2Forg%2Fopendaylight%2Fcontroller%2Fcluster%2Fdatastore%2FShard.java;h=b6b7ae12c8d9eaac33f4e5bdadaf5dc483a13f39;hp=ee83ce2513dc1f9c3c8582820254ebdc3c5957c6;hb=e2e1a247a7aeedff1bd2721d12050aa04cf4f67d;hpb=e970feb618c5e3793454f7f1a3974797a61c7c17 diff --git a/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/Shard.java b/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/Shard.java index ee83ce2513..b6b7ae12c8 100644 --- a/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/Shard.java +++ b/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/Shard.java @@ -12,22 +12,25 @@ import akka.actor.ActorRef; import akka.actor.ActorSelection; import akka.actor.Cancellable; import akka.actor.Props; -import akka.persistence.RecoveryFailure; import akka.serialization.Serialization; import com.google.common.annotations.VisibleForTesting; import com.google.common.base.Optional; import com.google.common.base.Preconditions; +import com.google.common.base.Throwables; import java.io.IOException; +import java.util.Collection; import java.util.Collections; import java.util.Map; +import java.util.concurrent.ExecutionException; import java.util.concurrent.TimeUnit; import javax.annotation.Nonnull; +import org.opendaylight.controller.cluster.access.concepts.TransactionIdentifier; import org.opendaylight.controller.cluster.common.actor.CommonConfig; +import org.opendaylight.controller.cluster.common.actor.MessageTracker; +import org.opendaylight.controller.cluster.common.actor.MessageTracker.Error; import org.opendaylight.controller.cluster.common.actor.MeteringBehavior; -import org.opendaylight.controller.cluster.datastore.ShardCommitCoordinator.CohortEntry; import org.opendaylight.controller.cluster.datastore.exceptions.NoShardLeaderException; import org.opendaylight.controller.cluster.datastore.identifiers.ShardIdentifier; -import org.opendaylight.controller.cluster.datastore.identifiers.ShardTransactionIdentifier; import org.opendaylight.controller.cluster.datastore.jmx.mbeans.shard.ShardMBeanFactory; import org.opendaylight.controller.cluster.datastore.jmx.mbeans.shard.ShardStats; import org.opendaylight.controller.cluster.datastore.messages.AbortTransaction; @@ -39,6 +42,8 @@ import org.opendaylight.controller.cluster.datastore.messages.CommitTransaction; import org.opendaylight.controller.cluster.datastore.messages.CommitTransactionReply; import org.opendaylight.controller.cluster.datastore.messages.CreateTransaction; import org.opendaylight.controller.cluster.datastore.messages.CreateTransactionReply; +import org.opendaylight.controller.cluster.datastore.messages.DatastoreSnapshot; +import org.opendaylight.controller.cluster.datastore.messages.DatastoreSnapshot.ShardSnapshot; import org.opendaylight.controller.cluster.datastore.messages.ForwardedReadyTransaction; import org.opendaylight.controller.cluster.datastore.messages.GetShardDataTree; import org.opendaylight.controller.cluster.datastore.messages.PeerAddressResolved; @@ -47,11 +52,9 @@ import org.opendaylight.controller.cluster.datastore.messages.RegisterChangeList import org.opendaylight.controller.cluster.datastore.messages.RegisterDataTreeChangeListener; import org.opendaylight.controller.cluster.datastore.messages.ShardLeaderStateChanged; import org.opendaylight.controller.cluster.datastore.messages.UpdateSchemaContext; -import org.opendaylight.controller.cluster.datastore.modification.Modification; -import org.opendaylight.controller.cluster.datastore.modification.ModificationPayload; -import org.opendaylight.controller.cluster.datastore.modification.MutableCompositeModification; +import org.opendaylight.controller.cluster.datastore.persisted.CommitTransactionPayload; +import org.opendaylight.controller.cluster.datastore.persisted.DataTreeCandidateSupplier; import org.opendaylight.controller.cluster.datastore.utils.Dispatchers; -import org.opendaylight.controller.cluster.datastore.utils.MessageTracker; import org.opendaylight.controller.cluster.notifications.LeaderStateChanged; import org.opendaylight.controller.cluster.notifications.RegisterRoleChangeListener; import org.opendaylight.controller.cluster.notifications.RoleChangeNotifier; @@ -61,12 +64,13 @@ import org.opendaylight.controller.cluster.raft.RaftActorSnapshotCohort; import org.opendaylight.controller.cluster.raft.RaftState; import org.opendaylight.controller.cluster.raft.base.messages.FollowerInitialSyncUpStatus; import org.opendaylight.controller.cluster.raft.messages.AppendEntriesReply; -import org.opendaylight.controller.cluster.raft.protobuff.client.messages.CompositeModificationByteStringPayload; -import org.opendaylight.controller.cluster.raft.protobuff.client.messages.CompositeModificationPayload; -import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTree; +import org.opendaylight.controller.cluster.raft.messages.ServerRemoved; +import org.opendaylight.controller.cluster.raft.protobuff.client.messages.Payload; +import org.opendaylight.yangtools.concepts.Identifier; import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidate; import org.opendaylight.yangtools.yang.data.api.schema.tree.DataValidationFailedException; import org.opendaylight.yangtools.yang.data.api.schema.tree.ModificationType; +import org.opendaylight.yangtools.yang.data.api.schema.tree.TreeType; import org.opendaylight.yangtools.yang.model.api.SchemaContext; import scala.concurrent.duration.Duration; import scala.concurrent.duration.FiniteDuration; @@ -79,13 +83,24 @@ import scala.concurrent.duration.FiniteDuration; */ public class Shard extends RaftActor { - protected static final Object TX_COMMIT_TIMEOUT_CHECK_MESSAGE = "txCommitTimeoutCheck"; - @VisibleForTesting - static final Object GET_SHARD_MBEAN_MESSAGE = "getShardMBeanMessage"; + static final Object TX_COMMIT_TIMEOUT_CHECK_MESSAGE = new Object() { + @Override + public String toString() { + return "txCommitTimeoutCheck"; + } + }; @VisibleForTesting - static final String DEFAULT_NAME = "default"; + static final Object GET_SHARD_MBEAN_MESSAGE = new Object() { + @Override + public String toString() { + return "getShardMBeanMessage"; + } + }; + + // FIXME: shard names should be encapsulated in their own class and this should be exposed as a constant. + public static final String DEFAULT_NAME = "default"; // The state of this Shard private final ShardDataTree store; @@ -114,18 +129,26 @@ public class Shard extends RaftActor { private final DataTreeChangeListenerSupport treeChangeSupport = new DataTreeChangeListenerSupport(this); private final DataChangeListenerSupport changeSupport = new DataChangeListenerSupport(this); + + private ShardSnapshot restoreFromSnapshot; + + private final ShardTransactionMessageRetrySupport messageRetrySupport; + protected Shard(AbstractBuilder builder) { super(builder.getId().toString(), builder.getPeerAddresses(), Optional.of(builder.getDatastoreContext().getShardRaftConfig()), DataStoreVersions.CURRENT_VERSION); this.name = builder.getId().toString(); this.datastoreContext = builder.getDatastoreContext(); + this.restoreFromSnapshot = builder.getRestoreFromSnapshot(); setPersistence(datastoreContext.isPersistent()); LOG.info("Shard created : {}, persistent : {}", name, datastoreContext.isPersistent()); - store = new ShardDataTree(builder.getSchemaContext()); + store = new ShardDataTree(builder.getSchemaContext(), builder.getTreeType(), + new ShardDataTreeChangeListenerPublisherActorProxy(getContext(), name + "-DTCL-publisher"), + new ShardDataChangeListenerPublisherActorProxy(getContext(), name + "-DCL-publisher"), name); shardMBean = ShardMBeanFactory.getShardStatsMBean(name.toString(), datastoreContext.getDataStoreMXBeanType()); @@ -137,7 +160,7 @@ public class Shard extends RaftActor { commitCoordinator = new ShardCommitCoordinator(store, datastoreContext.getShardCommitQueueExpiryTimeoutInMillis(), - datastoreContext.getShardTransactionCommitQueueCapacity(), self(), LOG, this.name); + datastoreContext.getShardTransactionCommitQueueCapacity(), LOG, this.name); setTransactionCommitTimeout(); @@ -151,9 +174,10 @@ public class Shard extends RaftActor { new Dispatchers(context().system().dispatchers()).getDispatcherPath( Dispatchers.DispatcherType.Transaction), self(), getContext(), shardMBean); - snapshotCohort = new ShardSnapshotCohort(transactionActorFactory, store, LOG, this.name); - + snapshotCohort = new ShardSnapshotCohort(builder.getId().getMemberName(), transactionActorFactory, store, + LOG, this.name); + messageRetrySupport = new ShardTransactionMessageRetrySupport(this); } private void setTransactionCommitTimeout() { @@ -173,62 +197,52 @@ public class Shard extends RaftActor { super.postStop(); + messageRetrySupport.close(); + if(txCommitTimeoutCheckSchedule != null) { txCommitTimeoutCheckSchedule.cancel(); } + commitCoordinator.abortPendingTransactions("Transaction aborted due to shutdown.", this); + shardMBean.unregisterMBean(); } @Override - public void onReceiveRecover(final Object message) throws Exception { - if(LOG.isDebugEnabled()) { - LOG.debug("{}: onReceiveRecover: Received message {} from {}", persistenceId(), - message.getClass().toString(), getSender()); - } + protected void handleRecover(final Object message) { + LOG.debug("{}: onReceiveRecover: Received message {} from {}", persistenceId(), message.getClass(), + getSender()); - if (message instanceof RecoveryFailure){ - LOG.error("{}: Recovery failed because of this cause", - persistenceId(), ((RecoveryFailure) message).cause()); - - // Even though recovery failed, we still need to finish our recovery, eg send the - // ActorInitialized message and start the txCommitTimeoutCheckSchedule. - onRecoveryComplete(); - } else { - super.onReceiveRecover(message); - if(LOG.isTraceEnabled()) { - appendEntriesReplyTracker.begin(); - } + super.handleRecover(message); + if (LOG.isTraceEnabled()) { + appendEntriesReplyTracker.begin(); } } @Override - public void onReceiveCommand(final Object message) throws Exception { - - MessageTracker.Context context = appendEntriesReplyTracker.received(message); - - if(context.error().isPresent()){ - LOG.trace("{} : AppendEntriesReply failed to arrive at the expected interval {}", persistenceId(), - context.error()); - } + protected void handleNonRaftCommand(final Object message) { + try (final MessageTracker.Context context = appendEntriesReplyTracker.received(message)) { + final Optional maybeError = context.error(); + if (maybeError.isPresent()) { + LOG.trace("{} : AppendEntriesReply failed to arrive at the expected interval {}", persistenceId(), + maybeError.get()); + } - try { - if (CreateTransaction.SERIALIZABLE_CLASS.isInstance(message)) { + if (CreateTransaction.isSerializedType(message)) { handleCreateTransaction(message); - } else if (BatchedModifications.class.isInstance(message)) { + } else if (message instanceof BatchedModifications) { handleBatchedModifications((BatchedModifications)message); } else if (message instanceof ForwardedReadyTransaction) { - commitCoordinator.handleForwardedReadyTransaction((ForwardedReadyTransaction) message, - getSender(), this); + handleForwardedReadyTransaction((ForwardedReadyTransaction) message); } else if (message instanceof ReadyLocalTransaction) { handleReadyLocalTransaction((ReadyLocalTransaction)message); - } else if (CanCommitTransaction.SERIALIZABLE_CLASS.isInstance(message)) { + } else if (CanCommitTransaction.isSerializedType(message)) { handleCanCommitTransaction(CanCommitTransaction.fromSerializable(message)); - } else if (CommitTransaction.SERIALIZABLE_CLASS.isInstance(message)) { + } else if (CommitTransaction.isSerializedType(message)) { handleCommitTransaction(CommitTransaction.fromSerializable(message)); - } else if (AbortTransaction.SERIALIZABLE_CLASS.isInstance(message)) { + } else if (AbortTransaction.isSerializedType(message)) { handleAbortTransaction(AbortTransaction.fromSerializable(message)); - } else if (CloseTransactionChain.SERIALIZABLE_CLASS.isInstance(message)) { + } else if (CloseTransactionChain.isSerializedType(message)) { closeTransactionChain(CloseTransactionChain.fromSerializable(message)); } else if (message instanceof RegisterChangeListener) { changeSupport.onMessage((RegisterChangeListener) message, isLeader(), hasLeader()); @@ -240,8 +254,8 @@ public class Shard extends RaftActor { PeerAddressResolved resolved = (PeerAddressResolved) message; setPeerAddress(resolved.getPeerId().toString(), resolved.getPeerAddress()); - } else if (message.equals(TX_COMMIT_TIMEOUT_CHECK_MESSAGE)) { - handleTransactionCommitTimeoutCheck(); + } else if (TX_COMMIT_TIMEOUT_CHECK_MESSAGE.equals(message)) { + commitCoordinator.checkForExpiredTransactions(transactionCommitTimeout, this); } else if(message instanceof DatastoreContext) { onDatastoreContext((DatastoreContext)message); } else if(message instanceof RegisterRoleChangeListener){ @@ -251,13 +265,18 @@ public class Shard extends RaftActor { context().parent().tell(message, self()); } else if(GET_SHARD_MBEAN_MESSAGE.equals(message)){ sender().tell(getShardMBean(), self()); - } else if(message instanceof GetShardDataTree){ + } else if(message instanceof GetShardDataTree) { sender().tell(store.getDataTree(), self()); + } else if(message instanceof ServerRemoved){ + context().parent().forward(message, context()); + } else if(ShardTransactionMessageRetrySupport.TIMER_MESSAGE_CLASS.isInstance(message)) { + messageRetrySupport.onTimerMessage(message); + } else if (message instanceof DataTreeCohortActorRegistry.CohortRegistryCommand) { + commitCoordinator.processCohortRegistryCommand(getSender(), + (DataTreeCohortActorRegistry.CohortRegistryCommand) message); } else { - super.onReceiveCommand(message); + super.handleNonRaftCommand(message); } - } finally { - context.done(); } } @@ -269,6 +288,10 @@ public class Shard extends RaftActor { return commitCoordinator.getQueueSize(); } + public int getCohortCacheSize() { + return commitCoordinator.getCohortCacheSize(); + } + @Override protected Optional getRoleChangeNotifier() { return roleChangeNotifier; @@ -276,9 +299,8 @@ public class Shard extends RaftActor { @Override protected LeaderStateChanged newLeaderStateChanged(String memberId, String leaderId, short leaderPayloadVersion) { - return new ShardLeaderStateChanged(memberId, leaderId, - isLeader() ? Optional.of(store.getDataTree()) : Optional.absent(), - leaderPayloadVersion); + return isLeader() ? new ShardLeaderStateChanged(memberId, leaderId, store.getDataTree(), leaderPayloadVersion) + : new ShardLeaderStateChanged(memberId, leaderId, leaderPayloadVersion); } protected void onDatastoreContext(DatastoreContext context) { @@ -297,51 +319,80 @@ public class Shard extends RaftActor { updateConfigParams(datastoreContext.getShardRaftConfig()); } - private void handleTransactionCommitTimeoutCheck() { - CohortEntry cohortEntry = commitCoordinator.getCurrentCohortEntry(); - if(cohortEntry != null) { - if(cohortEntry.isExpired(transactionCommitTimeout)) { - LOG.warn("{}: Current transaction {} has timed out after {} ms - aborting", - persistenceId(), cohortEntry.getTransactionID(), transactionCommitTimeout); - - doAbortTransaction(cohortEntry.getTransactionID(), null); - } - } - - commitCoordinator.cleanupExpiredCohortEntries(); - } - private static boolean isEmptyCommit(final DataTreeCandidate candidate) { return ModificationType.UNMODIFIED.equals(candidate.getRootNode().getModificationType()); } void continueCommit(final CohortEntry cohortEntry) { final DataTreeCandidate candidate = cohortEntry.getCandidate(); + final TransactionIdentifier transactionId = cohortEntry.getTransactionID(); // If we do not have any followers and we are not using persistence // or if cohortEntry has no modifications // we can apply modification to the state immediately if ((!hasFollowers() && !persistence().isRecoveryApplicable()) || isEmptyCommit(candidate)) { - applyModificationToState(cohortEntry.getReplySender(), cohortEntry.getTransactionID(), candidate); - } else { - Shard.this.persistData(cohortEntry.getReplySender(), cohortEntry.getTransactionID(), - DataTreeCandidatePayload.create(candidate)); + applyModificationToState(cohortEntry.getReplySender(), transactionId, candidate); + return; + } + + final Payload payload; + try { + payload = CommitTransactionPayload.create(transactionId, candidate); + } catch (IOException e) { + LOG.error("{}: failed to encode transaction {} candidate {}", persistenceId(), transactionId, candidate, + e); + // TODO: do we need to do something smarter here? + throw Throwables.propagate(e); } + + persistData(cohortEntry.getReplySender(), cohortEntry.getTransactionID(), payload); } private void handleCommitTransaction(final CommitTransaction commit) { - if(!commitCoordinator.handleCommit(commit.getTransactionID(), getSender(), this)) { - shardMBean.incrementFailedTransactionsCount(); + if (isLeader()) { + if(!commitCoordinator.handleCommit(commit.getTransactionID(), getSender(), this)) { + shardMBean.incrementFailedTransactionsCount(); + } + } else { + ActorSelection leader = getLeader(); + if (leader == null) { + messageRetrySupport.addMessageToRetry(commit, getSender(), + "Could not commit transaction " + commit.getTransactionID()); + } else { + LOG.debug("{}: Forwarding CommitTransaction to leader {}", persistenceId(), leader); + leader.forward(commit, getContext()); + } } } - private void finishCommit(@Nonnull final ActorRef sender, @Nonnull final String transactionID, @Nonnull final CohortEntry cohortEntry) { + private void finishCommit(@Nonnull final ActorRef sender, @Nonnull final Identifier transactionID, + @Nonnull final CohortEntry cohortEntry) { LOG.debug("{}: Finishing commit for transaction {}", persistenceId(), cohortEntry.getTransactionID()); try { + try { cohortEntry.commit(); + } catch(ExecutionException e) { + // We may get a "store tree and candidate base differ" IllegalStateException from commit under + // certain edge case scenarios so we'll try to re-apply the candidate from scratch as a last + // resort. Eg, we're a follower and a tx payload is replicated but the leader goes down before + // applying it to the state. We then become the leader and a second tx is pre-committed and + // replicated. When consensus occurs, this will cause the first tx to be applied as a foreign + // candidate via applyState prior to the second tx. Since the second tx has already been + // pre-committed, when it gets here to commit it will get an IllegalStateException. + + // FIXME - this is not an ideal way to handle this scenario. This is temporary - a cleaner + // solution will be forthcoming. + if(e.getCause() instanceof IllegalStateException) { + LOG.debug("{}: commit failed for transaction {} - retrying as foreign candidate", persistenceId(), + transactionID, e); + store.applyForeignCandidate(transactionID, cohortEntry.getCandidate()); + } else { + throw e; + } + } - sender.tell(CommitTransactionReply.INSTANCE.toSerializable(), getSelf()); + sender.tell(CommitTransactionReply.instance(cohortEntry.getClientVersion()).toSerializable(), getSelf()); shardMBean.incrementCommittedTransactionCount(); shardMBean.setLastCommittedTransactionTime(System.currentTimeMillis()); @@ -357,7 +408,7 @@ public class Shard extends RaftActor { } } - private void finishCommit(@Nonnull final ActorRef sender, final @Nonnull String transactionID) { + private void finishCommit(@Nonnull final ActorRef sender, final @Nonnull Identifier transactionID) { // With persistence enabled, this method is called via applyState by the leader strategy // after the commit has been replicated to a majority of the followers. @@ -378,7 +429,8 @@ public class Shard extends RaftActor { LOG.error("{}: Failed to re-apply transaction {}", persistenceId(), transactionID, e); } - sender.tell(CommitTransactionReply.INSTANCE.toSerializable(), getSelf()); + sender.tell(CommitTransactionReply.instance(cohortEntry.getClientVersion()).toSerializable(), + getSelf()); } else { // This really shouldn't happen - it likely means that persistence or replication // took so long to complete such that the cohort entry was expired from the cache. @@ -395,18 +447,24 @@ public class Shard extends RaftActor { private void handleCanCommitTransaction(final CanCommitTransaction canCommit) { LOG.debug("{}: Can committing transaction {}", persistenceId(), canCommit.getTransactionID()); - commitCoordinator.handleCanCommit(canCommit.getTransactionID(), getSender(), this); - } - private void noLeaderError(String errMessage, Object message) { - // TODO: rather than throwing an immediate exception, we could schedule a timer to try again to make - // it more resilient in case we're in the process of electing a new leader. - getSender().tell(new akka.actor.Status.Failure(new NoShardLeaderException(errMessage, persistenceId())), getSelf()); + if (isLeader()) { + commitCoordinator.handleCanCommit(canCommit.getTransactionID(), getSender(), this); + } else { + ActorSelection leader = getLeader(); + if (leader == null) { + messageRetrySupport.addMessageToRetry(canCommit, getSender(), + "Could not canCommit transaction " + canCommit.getTransactionID()); + } else { + LOG.debug("{}: Forwarding CanCommitTransaction to leader {}", persistenceId(), leader); + leader.forward(canCommit, getContext()); + } + } } protected void handleBatchedModificationsLocal(BatchedModifications batched, ActorRef sender) { try { - commitCoordinator.handleBatchedModifications(batched, sender, this); + commitCoordinator.handleBatchedModifications(batched, sender, this, store.getSchemaContext()); } catch (Exception e) { LOG.error("{}: Error handling BatchedModifications for Tx {}", persistenceId(), batched.getTransactionID(), e); @@ -427,20 +485,28 @@ public class Shard extends RaftActor { // the primary/leader shard. However with timing and caching on the front-end, there's a small // window where it could have a stale leader during leadership transitions. // - if(isLeader()) { - failIfIsolatedLeader(getSender()); - + boolean isLeaderActive = isLeaderActive(); + if (isLeader() && isLeaderActive) { handleBatchedModificationsLocal(batched, getSender()); } else { ActorSelection leader = getLeader(); - if(leader != null) { - // TODO: what if this is not the first batch and leadership changed in between batched messages? - // We could check if the commitCoordinator already has a cached entry and forward all the previous - // batched modifications. - LOG.debug("{}: Forwarding BatchedModifications to leader {}", persistenceId(), leader); - leader.forward(batched, getContext()); + if (!isLeaderActive || leader == null) { + messageRetrySupport.addMessageToRetry(batched, getSender(), + "Could not commit transaction " + batched.getTransactionID()); } else { - noLeaderError("Could not commit transaction " + batched.getTransactionID(), batched); + // If this is not the first batch and leadership changed in between batched messages, + // we need to reconstruct previous BatchedModifications from the transaction + // DataTreeModification, honoring the max batched modification count, and forward all the + // previous BatchedModifications to the new leader. + Collection newModifications = commitCoordinator.createForwardedBatchedModifications( + batched, datastoreContext.getShardBatchedModificationCount()); + + LOG.debug("{}: Forwarding {} BatchedModifications to leader {}", persistenceId(), + newModifications.size(), leader); + + for(BatchedModifications bm: newModifications) { + leader.forward(bm, getContext()); + } } } } @@ -462,11 +528,12 @@ public class Shard extends RaftActor { } private void handleReadyLocalTransaction(final ReadyLocalTransaction message) { - if (isLeader()) { - failIfIsolatedLeader(getSender()); + LOG.debug("{}: handleReadyLocalTransaction for {}", persistenceId(), message.getTransactionID()); + boolean isLeaderActive = isLeaderActive(); + if (isLeader() && isLeaderActive) { try { - commitCoordinator.handleReadyLocalTransaction(message, getSender(), this); + commitCoordinator.handleReadyLocalTransaction(message, getSender(), this, store.getSchemaContext()); } catch (Exception e) { LOG.error("{}: Error handling ReadyLocalTransaction for Tx {}", persistenceId(), message.getTransactionID(), e); @@ -474,12 +541,36 @@ public class Shard extends RaftActor { } } else { ActorSelection leader = getLeader(); - if (leader != null) { + if (!isLeaderActive || leader == null) { + messageRetrySupport.addMessageToRetry(message, getSender(), + "Could not commit transaction " + message.getTransactionID()); + } else { LOG.debug("{}: Forwarding ReadyLocalTransaction to leader {}", persistenceId(), leader); message.setRemoteVersion(getCurrentBehavior().getLeaderPayloadVersion()); leader.forward(message, getContext()); + } + } + } + + private void handleForwardedReadyTransaction(ForwardedReadyTransaction forwardedReady) { + LOG.debug("{}: handleForwardedReadyTransaction for {}", persistenceId(), forwardedReady.getTransactionID()); + + boolean isLeaderActive = isLeaderActive(); + if (isLeader() && isLeaderActive) { + commitCoordinator.handleForwardedReadyTransaction(forwardedReady, getSender(), this, + store.getSchemaContext()); + } else { + ActorSelection leader = getLeader(); + if (!isLeaderActive || leader == null) { + messageRetrySupport.addMessageToRetry(forwardedReady, getSender(), + "Could not commit transaction " + forwardedReady.getTransactionID()); } else { - noLeaderError("Could not commit transaction " + message.getTransactionID(), message); + LOG.debug("{}: Forwarding ForwardedReadyTransaction to leader {}", persistenceId(), leader); + + ReadyLocalTransaction readyLocal = new ReadyLocalTransaction(forwardedReady.getTransactionID(), + forwardedReady.getTransaction().getSnapshot(), forwardedReady.isDoImmediateCommit()); + readyLocal.setRemoteVersion(getCurrentBehavior().getLeaderPayloadVersion()); + leader.forward(readyLocal, getContext()); } } } @@ -488,7 +579,7 @@ public class Shard extends RaftActor { doAbortTransaction(abort.getTransactionID(), getSender()); } - void doAbortTransaction(final String transactionID, final ActorRef sender) { + void doAbortTransaction(final TransactionIdentifier transactionID, final ActorRef sender) { commitCoordinator.handleAbort(transactionID, sender, this); } @@ -504,15 +595,7 @@ public class Shard extends RaftActor { } private void closeTransactionChain(final CloseTransactionChain closeTransactionChain) { - store.closeTransactionChain(closeTransactionChain.getTransactionChainId()); - } - - private ActorRef createTypedTransactionActor(int transactionType, - ShardTransactionIdentifier transactionId, String transactionChainId, - short clientVersion ) { - - return transactionActorFactory.newShardTransaction(TransactionType.fromInt(transactionType), - transactionId, transactionChainId, clientVersion); + store.closeTransactionChain(closeTransactionChain.getIdentifier()); } private void createTransaction(CreateTransaction createTransaction) { @@ -523,34 +606,23 @@ public class Shard extends RaftActor { } ActorRef transactionActor = createTransaction(createTransaction.getTransactionType(), - createTransaction.getTransactionId(), createTransaction.getTransactionChainId(), - createTransaction.getVersion()); + createTransaction.getTransactionId()); getSender().tell(new CreateTransactionReply(Serialization.serializedActorPath(transactionActor), - createTransaction.getTransactionId()).toSerializable(), getSelf()); + createTransaction.getTransactionId(), createTransaction.getVersion()).toSerializable(), getSelf()); } catch (Exception e) { getSender().tell(new akka.actor.Status.Failure(e), getSelf()); } } - private ActorRef createTransaction(int transactionType, String remoteTransactionId, - String transactionChainId, short clientVersion) { - - - ShardTransactionIdentifier transactionId = new ShardTransactionIdentifier(remoteTransactionId); - - if(LOG.isDebugEnabled()) { - LOG.debug("{}: Creating transaction : {} ", persistenceId(), transactionId); - } - - ActorRef transactionActor = createTypedTransactionActor(transactionType, transactionId, - transactionChainId, clientVersion); - - return transactionActor; + private ActorRef createTransaction(int transactionType, TransactionIdentifier transactionId) { + LOG.debug("{}: Creating transaction : {} ", persistenceId(), transactionId); + return transactionActorFactory.newShardTransaction(TransactionType.fromInt(transactionType), + transactionId); } - private void commitWithNewTransaction(final Modification modification) { - ReadWriteShardDataTreeTransaction tx = store.newReadWriteTransaction(modification.toString(), null); + private void commitWithNewTransaction(final BatchedModifications modification) { + ReadWriteShardDataTreeTransaction tx = store.newReadWriteTransaction(modification.getTransactionID()); modification.apply(tx.getSnapshot()); try { snapshotCohort.syncCommitTransaction(tx); @@ -585,11 +657,14 @@ public class Shard extends RaftActor { @Override @Nonnull protected RaftActorRecoveryCohort getRaftActorRecoveryCohort() { - return new ShardRecoveryCoordinator(store, store.getSchemaContext(), persistenceId(), LOG); + return new ShardRecoveryCoordinator(store, store.getSchemaContext(), + restoreFromSnapshot != null ? restoreFromSnapshot.getSnapshot() : null, persistenceId(), LOG); } @Override protected void onRecoveryComplete() { + restoreFromSnapshot = null; + //notify shard manager getContext().parent().tell(new ActorInitialized(), getSelf()); @@ -605,12 +680,12 @@ public class Shard extends RaftActor { } @Override - protected void applyState(final ActorRef clientActor, final String identifier, final Object data) { - if (data instanceof DataTreeCandidatePayload) { + protected void applyState(final ActorRef clientActor, final Identifier identifier, final Object data) { + if (data instanceof DataTreeCandidateSupplier) { if (clientActor == null) { // No clientActor indicates a replica coming from the leader try { - store.applyForeignCandidate(identifier, ((DataTreeCandidatePayload)data).getCandidate()); + store.applyForeignCandidate(identifier, ((DataTreeCandidateSupplier)data).getCandidate().getValue()); } catch (DataValidationFailedException | IOException e) { LOG.error("{}: Error applying replica {}", persistenceId(), identifier, e); } @@ -618,28 +693,13 @@ public class Shard extends RaftActor { // Replication consensus reached, proceed to commit finishCommit(clientActor, identifier); } - } else if (data instanceof ModificationPayload) { - try { - applyModificationToState(clientActor, identifier, ((ModificationPayload) data).getModification()); - } catch (ClassNotFoundException | IOException e) { - LOG.error("{}: Error extracting ModificationPayload", persistenceId(), e); - } - } else if (data instanceof CompositeModificationPayload) { - Object modification = ((CompositeModificationPayload) data).getModification(); - - applyModificationToState(clientActor, identifier, modification); - } else if(data instanceof CompositeModificationByteStringPayload ){ - Object modification = ((CompositeModificationByteStringPayload) data).getModification(); - - applyModificationToState(clientActor, identifier, modification); } else { - LOG.error("{}: Unknown state received {} Class loader = {} CompositeNodeMod.ClassLoader = {}", - persistenceId(), data, data.getClass().getClassLoader(), - CompositeModificationPayload.class.getClassLoader()); + LOG.error("{}: Unknown state received {} ClassLoader {}", persistenceId(), data, + data.getClass().getClassLoader()); } } - private void applyModificationToState(ActorRef clientActor, String identifier, Object modification) { + private void applyModificationToState(ActorRef clientActor, Identifier identifier, Object modification) { if(modification == null) { LOG.error( "{}: modification is null - this is very unexpected, clientActor = {}, identifier = {}", @@ -647,7 +707,11 @@ public class Shard extends RaftActor { } else if(clientActor == null) { // There's no clientActor to which to send a commit reply so we must be applying // replicated state from the leader. - commitWithNewTransaction(MutableCompositeModification.fromSerializable(modification)); + + // The only implementation we know of is BatchedModifications, which also carries a transaction + // identifier -- which we really need that. + Preconditions.checkArgument(modification instanceof BatchedModifications); + commitWithNewTransaction((BatchedModifications)modification); } else { // This must be the OK to commit after replication consensus. finishCommit(clientActor, identifier); @@ -671,11 +735,49 @@ public class Shard extends RaftActor { store.closeAllTransactionChains(); } + + if(hasLeader && !isIsolatedLeader()) { + messageRetrySupport.retryMessages(); + } } @Override protected void onLeaderChanged(String oldLeader, String newLeader) { shardMBean.incrementLeadershipChangeCount(); + + boolean hasLeader = hasLeader(); + if(hasLeader && !isLeader()) { + // Another leader was elected. If we were the previous leader and had pending transactions, convert + // them to transaction messages and send to the new leader. + ActorSelection leader = getLeader(); + if(leader != null) { + Collection messagesToForward = commitCoordinator.convertPendingTransactionsToMessages( + datastoreContext.getShardBatchedModificationCount()); + + if(!messagesToForward.isEmpty()) { + LOG.debug("{}: Forwarding {} pending transaction messages to leader {}", persistenceId(), + messagesToForward.size(), leader); + + for(Object message: messagesToForward) { + leader.tell(message, self()); + } + } + } else { + commitCoordinator.abortPendingTransactions( + "The transacton was aborted due to inflight leadership change and the leader address isn't available.", + this); + } + } + + if(hasLeader && !isIsolatedLeader()) { + messageRetrySupport.retryMessages(); + } + } + + @Override + protected void pauseLeader(Runnable operation) { + LOG.debug("{}: In pauseLeader, operation: {}", persistenceId(), operation); + commitCoordinator.setRunOnPendingTransactionsComplete(operation); } @Override @@ -712,6 +814,7 @@ public class Shard extends RaftActor { private Map peerAddresses = Collections.emptyMap(); private DatastoreContext datastoreContext; private SchemaContext schemaContext; + private DatastoreSnapshot.ShardSnapshot restoreFromSnapshot; private volatile boolean sealed; protected AbstractBuilder(Class shardClass) { @@ -751,6 +854,12 @@ public class Shard extends RaftActor { return self(); } + public T restoreFromSnapshot(DatastoreSnapshot.ShardSnapshot restoreFromSnapshot) { + checkSealed(); + this.restoreFromSnapshot = restoreFromSnapshot; + return self(); + } + public ShardIdentifier getId() { return id; } @@ -767,6 +876,21 @@ public class Shard extends RaftActor { return schemaContext; } + public DatastoreSnapshot.ShardSnapshot getRestoreFromSnapshot() { + return restoreFromSnapshot; + } + + public TreeType getTreeType() { + switch (datastoreContext.getLogicalStoreType()) { + case CONFIGURATION: + return TreeType.CONFIGURATION; + case OPERATIONAL: + return TreeType.OPERATIONAL; + } + + throw new IllegalStateException("Unhandled logical store type " + datastoreContext.getLogicalStoreType()); + } + protected void verify() { Preconditions.checkNotNull(id, "id should not be null"); Preconditions.checkNotNull(peerAddresses, "peerAddresses should not be null");