/*
* Copyright (c) 2014 Cisco Systems, Inc. and others. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0 which accompanies this distribution,
* and is available at http://www.eclipse.org/legal/epl-v10.html
*/
package org.opendaylight.controller.cluster.datastore;
import akka.actor.ActorRef;
import akka.actor.ActorSelection;
import akka.actor.Cancellable;
import akka.actor.Props;
import akka.japi.Creator;
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.util.concurrent.FutureCallback;
import com.google.common.util.concurrent.Futures;
import com.google.common.util.concurrent.ListenableFuture;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import javax.annotation.Nonnull;
import org.opendaylight.controller.cluster.common.actor.CommonConfig;
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;
import org.opendaylight.controller.cluster.datastore.messages.AbortTransactionReply;
import org.opendaylight.controller.cluster.datastore.messages.ActorInitialized;
import org.opendaylight.controller.cluster.datastore.messages.BatchedModifications;
import org.opendaylight.controller.cluster.datastore.messages.CanCommitTransaction;
import org.opendaylight.controller.cluster.datastore.messages.CloseTransactionChain;
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.ForwardedReadyTransaction;
import org.opendaylight.controller.cluster.datastore.messages.PeerAddressResolved;
import org.opendaylight.controller.cluster.datastore.messages.ReadyLocalTransaction;
import org.opendaylight.controller.cluster.datastore.messages.RegisterChangeListener;
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.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;
import org.opendaylight.controller.cluster.raft.RaftActor;
import org.opendaylight.controller.cluster.raft.RaftActorRecoveryCohort;
import org.opendaylight.controller.cluster.raft.RaftActorSnapshotCohort;
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.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.model.api.SchemaContext;
import scala.concurrent.duration.Duration;
import scala.concurrent.duration.FiniteDuration;
/**
* A Shard represents a portion of the logical data tree
*
* Our Shard uses InMemoryDataTree as it's internal representation and delegates all requests it
*
*/
public class Shard extends RaftActor {
private static final Object TX_COMMIT_TIMEOUT_CHECK_MESSAGE = "txCommitTimeoutCheck";
@VisibleForTesting
static final Object GET_SHARD_MBEAN_MESSAGE = "getShardMBeanMessage";
@VisibleForTesting
static final String DEFAULT_NAME = "default";
// The state of this Shard
private final ShardDataTree store;
/// The name of this shard
private final String name;
private final ShardStats shardMBean;
private DatastoreContext datastoreContext;
private final ShardCommitCoordinator commitCoordinator;
private long transactionCommitTimeout;
private Cancellable txCommitTimeoutCheckSchedule;
private final Optional roleChangeNotifier;
private final MessageTracker appendEntriesReplyTracker;
private final ShardTransactionActorFactory transactionActorFactory;
private final ShardSnapshotCohort snapshotCohort;
private final DataTreeChangeListenerSupport treeChangeSupport = new DataTreeChangeListenerSupport(this);
private final DataChangeListenerSupport changeSupport = new DataChangeListenerSupport(this);
protected Shard(final ShardIdentifier name, final Map peerAddresses,
final DatastoreContext datastoreContext, final SchemaContext schemaContext) {
super(name.toString(), new HashMap<>(peerAddresses), Optional.of(datastoreContext.getShardRaftConfig()),
DataStoreVersions.CURRENT_VERSION);
this.name = name.toString();
this.datastoreContext = datastoreContext;
setPersistence(datastoreContext.isPersistent());
LOG.info("Shard created : {}, persistent : {}", name, datastoreContext.isPersistent());
store = new ShardDataTree(schemaContext);
shardMBean = ShardMBeanFactory.getShardStatsMBean(name.toString(),
datastoreContext.getDataStoreMXBeanType());
shardMBean.setShardActor(getSelf());
if (isMetricsCaptureEnabled()) {
getContext().become(new MeteringBehavior(this));
}
commitCoordinator = new ShardCommitCoordinator(store,
datastoreContext.getShardCommitQueueExpiryTimeoutInMillis(),
datastoreContext.getShardTransactionCommitQueueCapacity(), self(), LOG, this.name);
setTransactionCommitTimeout();
// create a notifier actor for each cluster member
roleChangeNotifier = createRoleChangeNotifier(name.toString());
appendEntriesReplyTracker = new MessageTracker(AppendEntriesReply.class,
getRaftActorContext().getConfigParams().getIsolatedCheckIntervalInMillis());
transactionActorFactory = new ShardTransactionActorFactory(store, datastoreContext,
new Dispatchers(context().system().dispatchers()).getDispatcherPath(
Dispatchers.DispatcherType.Transaction), self(), getContext(), shardMBean);
snapshotCohort = new ShardSnapshotCohort(transactionActorFactory, store, LOG, this.name);
}
private void setTransactionCommitTimeout() {
transactionCommitTimeout = TimeUnit.MILLISECONDS.convert(
datastoreContext.getShardTransactionCommitTimeoutInSeconds(), TimeUnit.SECONDS) / 2;
}
public static Props props(final ShardIdentifier name,
final Map peerAddresses,
final DatastoreContext datastoreContext, final SchemaContext schemaContext) {
Preconditions.checkNotNull(name, "name should not be null");
Preconditions.checkNotNull(peerAddresses, "peerAddresses should not be null");
Preconditions.checkNotNull(datastoreContext, "dataStoreContext should not be null");
Preconditions.checkNotNull(schemaContext, "schemaContext should not be null");
return Props.create(new ShardCreator(name, peerAddresses, datastoreContext, schemaContext));
}
private Optional createRoleChangeNotifier(String shardId) {
ActorRef shardRoleChangeNotifier = this.getContext().actorOf(
RoleChangeNotifier.getProps(shardId), shardId + "-notifier");
return Optional.of(shardRoleChangeNotifier);
}
@Override
public void postStop() {
LOG.info("Stopping Shard {}", persistenceId());
super.postStop();
if(txCommitTimeoutCheckSchedule != null) {
txCommitTimeoutCheckSchedule.cancel();
}
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());
}
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();
}
}
}
@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());
}
try {
if (CreateTransaction.SERIALIZABLE_CLASS.isInstance(message)) {
handleCreateTransaction(message);
} else if (BatchedModifications.class.isInstance(message)) {
handleBatchedModifications((BatchedModifications)message);
} else if (message instanceof ForwardedReadyTransaction) {
commitCoordinator.handleForwardedReadyTransaction((ForwardedReadyTransaction) message,
getSender(), this);
} else if (message instanceof ReadyLocalTransaction) {
handleReadyLocalTransaction((ReadyLocalTransaction)message);
} else if (CanCommitTransaction.SERIALIZABLE_CLASS.isInstance(message)) {
handleCanCommitTransaction(CanCommitTransaction.fromSerializable(message));
} else if (CommitTransaction.SERIALIZABLE_CLASS.isInstance(message)) {
handleCommitTransaction(CommitTransaction.fromSerializable(message));
} else if (AbortTransaction.SERIALIZABLE_CLASS.isInstance(message)) {
handleAbortTransaction(AbortTransaction.fromSerializable(message));
} else if (CloseTransactionChain.SERIALIZABLE_CLASS.isInstance(message)) {
closeTransactionChain(CloseTransactionChain.fromSerializable(message));
} else if (message instanceof RegisterChangeListener) {
changeSupport.onMessage((RegisterChangeListener) message, isLeader());
} else if (message instanceof RegisterDataTreeChangeListener) {
treeChangeSupport.onMessage((RegisterDataTreeChangeListener) message, isLeader());
} else if (message instanceof UpdateSchemaContext) {
updateSchemaContext((UpdateSchemaContext) message);
} else if (message instanceof PeerAddressResolved) {
PeerAddressResolved resolved = (PeerAddressResolved) message;
setPeerAddress(resolved.getPeerId().toString(),
resolved.getPeerAddress());
} else if (message.equals(TX_COMMIT_TIMEOUT_CHECK_MESSAGE)) {
handleTransactionCommitTimeoutCheck();
} else if(message instanceof DatastoreContext) {
onDatastoreContext((DatastoreContext)message);
} else if(message instanceof RegisterRoleChangeListener){
roleChangeNotifier.get().forward(message, context());
} else if (message instanceof FollowerInitialSyncUpStatus) {
shardMBean.setFollowerInitialSyncStatus(((FollowerInitialSyncUpStatus) message).isInitialSyncDone());
context().parent().tell(message, self());
} else if(GET_SHARD_MBEAN_MESSAGE.equals(message)){
sender().tell(getShardMBean(), self());
} else {
super.onReceiveCommand(message);
}
} finally {
context.done();
}
}
@Override
protected Optional getRoleChangeNotifier() {
return roleChangeNotifier;
}
@Override
protected LeaderStateChanged newLeaderStateChanged(String memberId, String leaderId, short leaderPayloadVersion) {
return new ShardLeaderStateChanged(memberId, leaderId,
isLeader() ? Optional.of(store.getDataTree()) : Optional.absent(),
leaderPayloadVersion);
}
private void onDatastoreContext(DatastoreContext context) {
datastoreContext = context;
commitCoordinator.setQueueCapacity(datastoreContext.getShardTransactionCommitQueueCapacity());
setTransactionCommitTimeout();
if(datastoreContext.isPersistent() && !persistence().isRecoveryApplicable()) {
setPersistence(true);
} else if(!datastoreContext.isPersistent() && persistence().isRecoveryApplicable()) {
setPersistence(false);
}
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) throws Exception {
final DataTreeCandidate candidate = cohortEntry.getCohort().getCandidate();
// 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));
}
}
private void handleCommitTransaction(final CommitTransaction commit) {
if(!commitCoordinator.handleCommit(commit.getTransactionID(), getSender(), this)) {
shardMBean.incrementFailedTransactionsCount();
}
}
private void finishCommit(@Nonnull final ActorRef sender, @Nonnull final String transactionID, @Nonnull final CohortEntry cohortEntry) {
LOG.debug("{}: Finishing commit for transaction {}", persistenceId(), cohortEntry.getTransactionID());
try {
// We block on the future here so we don't have to worry about possibly accessing our
// state on a different thread outside of our dispatcher. Also, the data store
// currently uses a same thread executor anyway.
cohortEntry.getCohort().commit().get();
sender.tell(CommitTransactionReply.INSTANCE.toSerializable(), getSelf());
shardMBean.incrementCommittedTransactionCount();
shardMBean.setLastCommittedTransactionTime(System.currentTimeMillis());
} catch (Exception e) {
sender.tell(new akka.actor.Status.Failure(e), getSelf());
LOG.error("{}, An exception occurred while committing transaction {}", persistenceId(),
transactionID, e);
shardMBean.incrementFailedTransactionsCount();
} finally {
commitCoordinator.currentTransactionComplete(transactionID, true);
}
}
private void finishCommit(@Nonnull final ActorRef sender, final @Nonnull String 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.
CohortEntry cohortEntry = commitCoordinator.getCohortEntryIfCurrent(transactionID);
if (cohortEntry == null) {
// The transaction is no longer the current commit. This can happen if the transaction
// was aborted prior, most likely due to timeout in the front-end. We need to finish
// committing the transaction though since it was successfully persisted and replicated
// however we can't use the original cohort b/c it was already preCommitted and may
// conflict with the current commit or may have been aborted so we commit with a new
// transaction.
cohortEntry = commitCoordinator.getAndRemoveCohortEntry(transactionID);
if(cohortEntry != null) {
try {
store.applyForeignCandidate(transactionID, cohortEntry.getCohort().getCandidate());
} catch (DataValidationFailedException e) {
shardMBean.incrementFailedTransactionsCount();
LOG.error("{}: Failed to re-apply transaction {}", persistenceId(), transactionID, e);
}
sender.tell(CommitTransactionReply.INSTANCE.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.
IllegalStateException ex = new IllegalStateException(
String.format("%s: Could not finish committing transaction %s - no CohortEntry found",
persistenceId(), transactionID));
LOG.error(ex.getMessage());
sender.tell(new akka.actor.Status.Failure(ex), getSelf());
}
} else {
finishCommit(sender, transactionID, cohortEntry);
}
}
private void handleCanCommitTransaction(final CanCommitTransaction canCommit) {
LOG.debug("{}: Can committing transaction {}", persistenceId(), canCommit.getTransactionID());
commitCoordinator.handleCanCommit(canCommit.getTransactionID(), getSender(), this);
}
private void noLeaderError(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(String.format(
"Could not find the leader for shard %s. This typically happens" +
" when the system is coming up or recovering and a leader is being elected. Try again" +
" later.", persistenceId()))), getSelf());
}
private void handleBatchedModifications(BatchedModifications batched) {
// This message is sent to prepare the modifications transaction directly on the Shard as an
// optimization to avoid the extra overhead of a separate ShardTransaction actor. On the last
// BatchedModifications message, the caller sets the ready flag in the message indicating
// modifications are complete. The reply contains the cohort actor path (this actor) for the caller
// to initiate the 3-phase commit. This also avoids the overhead of sending an additional
// ReadyTransaction message.
// If we're not the leader then forward to the leader. This is a safety measure - we shouldn't
// normally get here if we're not the leader as the front-end (TransactionProxy) should determine
// 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()) {
try {
commitCoordinator.handleBatchedModifications(batched, getSender(), this);
} catch (Exception e) {
LOG.error("{}: Error handling BatchedModifications for Tx {}", persistenceId(),
batched.getTransactionID(), e);
getSender().tell(new akka.actor.Status.Failure(e), getSelf());
}
} 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());
} else {
noLeaderError(batched);
}
}
}
private void handleReadyLocalTransaction(final ReadyLocalTransaction message) {
if (isLeader()) {
try {
commitCoordinator.handleReadyLocalTransaction(message, getSender(), this);
} catch (Exception e) {
LOG.error("{}: Error handling LocalModifications for Tx {}", persistenceId(),
message.getTransactionID(), e);
getSender().tell(new akka.actor.Status.Failure(e), getSelf());
}
} else {
ActorSelection leader = getLeader();
if (leader != null) {
LOG.debug("{}: Forwarding LocalModifications to leader {}", persistenceId(), leader);
leader.forward(message, getContext());
} else {
noLeaderError(message);
}
}
}
private void handleAbortTransaction(final AbortTransaction abort) {
doAbortTransaction(abort.getTransactionID(), getSender());
}
void doAbortTransaction(final String transactionID, final ActorRef sender) {
final CohortEntry cohortEntry = commitCoordinator.getCohortEntryIfCurrent(transactionID);
if(cohortEntry != null) {
LOG.debug("{}: Aborting transaction {}", persistenceId(), transactionID);
// We don't remove the cached cohort entry here (ie pass false) in case the Tx was
// aborted during replication in which case we may still commit locally if replication
// succeeds.
commitCoordinator.currentTransactionComplete(transactionID, false);
final ListenableFuture future = cohortEntry.getCohort().abort();
final ActorRef self = getSelf();
Futures.addCallback(future, new FutureCallback() {
@Override
public void onSuccess(final Void v) {
shardMBean.incrementAbortTransactionsCount();
if(sender != null) {
sender.tell(AbortTransactionReply.INSTANCE.toSerializable(), self);
}
}
@Override
public void onFailure(final Throwable t) {
LOG.error("{}: An exception happened during abort", persistenceId(), t);
if(sender != null) {
sender.tell(new akka.actor.Status.Failure(t), self);
}
}
});
}
}
private void handleCreateTransaction(final Object message) {
if (isLeader()) {
createTransaction(CreateTransaction.fromSerializable(message));
} else if (getLeader() != null) {
getLeader().forward(message, getContext());
} else {
getSender().tell(new akka.actor.Status.Failure(new NoShardLeaderException(String.format(
"Could not find leader for shard %s so transaction cannot be created. This typically happens" +
" when the system is coming up or recovering and a leader is being elected. Try again" +
" later.", persistenceId()))), getSelf());
}
}
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);
}
private void createTransaction(CreateTransaction createTransaction) {
try {
ActorRef transactionActor = createTransaction(createTransaction.getTransactionType(),
createTransaction.getTransactionId(), createTransaction.getTransactionChainId(),
createTransaction.getVersion());
getSender().tell(new CreateTransactionReply(Serialization.serializedActorPath(transactionActor),
createTransaction.getTransactionId()).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 void commitWithNewTransaction(final Modification modification) {
ReadWriteShardDataTreeTransaction tx = store.newReadWriteTransaction(modification.toString(), null);
modification.apply(tx.getSnapshot());
try {
snapshotCohort.syncCommitTransaction(tx);
shardMBean.incrementCommittedTransactionCount();
shardMBean.setLastCommittedTransactionTime(System.currentTimeMillis());
} catch (Exception e) {
shardMBean.incrementFailedTransactionsCount();
LOG.error("{}: Failed to commit", persistenceId(), e);
}
}
private void updateSchemaContext(final UpdateSchemaContext message) {
updateSchemaContext(message.getSchemaContext());
}
@VisibleForTesting
void updateSchemaContext(final SchemaContext schemaContext) {
store.updateSchemaContext(schemaContext);
}
private boolean isMetricsCaptureEnabled() {
CommonConfig config = new CommonConfig(getContext().system().settings().config());
return config.isMetricCaptureEnabled();
}
@Override
protected RaftActorSnapshotCohort getRaftActorSnapshotCohort() {
return snapshotCohort;
}
@Override
@Nonnull
protected RaftActorRecoveryCohort getRaftActorRecoveryCohort() {
return new ShardRecoveryCoordinator(store, persistenceId(), LOG);
}
@Override
protected void onRecoveryComplete() {
store.recoveryDone();
//notify shard manager
getContext().parent().tell(new ActorInitialized(), getSelf());
// Being paranoid here - this method should only be called once but just in case...
if(txCommitTimeoutCheckSchedule == null) {
// Schedule a message to be periodically sent to check if the current in-progress
// transaction should be expired and aborted.
FiniteDuration period = Duration.create(transactionCommitTimeout / 3, TimeUnit.MILLISECONDS);
txCommitTimeoutCheckSchedule = getContext().system().scheduler().schedule(
period, period, getSelf(),
TX_COMMIT_TIMEOUT_CHECK_MESSAGE, getContext().dispatcher(), ActorRef.noSender());
}
}
@Override
protected void applyState(final ActorRef clientActor, final String identifier, final Object data) {
if (data instanceof DataTreeCandidatePayload) {
if (clientActor == null) {
// No clientActor indicates a replica coming from the leader
try {
store.applyForeignCandidate(identifier, ((DataTreeCandidatePayload)data).getCandidate());
} catch (DataValidationFailedException | IOException e) {
LOG.error("{}: Error applying replica {}", persistenceId(), identifier, e);
}
} else {
// 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());
}
}
private void applyModificationToState(ActorRef clientActor, String identifier, Object modification) {
if(modification == null) {
LOG.error(
"{}: modification is null - this is very unexpected, clientActor = {}, identifier = {}",
persistenceId(), identifier, clientActor != null ? clientActor.path().toString() : null);
} 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));
} else {
// This must be the OK to commit after replication consensus.
finishCommit(clientActor, identifier);
}
}
@Override
protected void onStateChanged() {
boolean isLeader = isLeader();
changeSupport.onLeadershipChange(isLeader);
treeChangeSupport.onLeadershipChange(isLeader);
// If this actor is no longer the leader close all the transaction chains
if (!isLeader) {
if(LOG.isDebugEnabled()) {
LOG.debug(
"{}: onStateChanged: Closing all transaction chains because shard {} is no longer the leader",
persistenceId(), getId());
}
store.closeAllTransactionChains();
}
}
@Override
protected void onLeaderChanged(String oldLeader, String newLeader) {
shardMBean.incrementLeadershipChangeCount();
}
@Override
public String persistenceId() {
return this.name;
}
@VisibleForTesting
ShardCommitCoordinator getCommitCoordinator() {
return commitCoordinator;
}
private static class ShardCreator implements Creator {
private static final long serialVersionUID = 1L;
final ShardIdentifier name;
final Map peerAddresses;
final DatastoreContext datastoreContext;
final SchemaContext schemaContext;
ShardCreator(final ShardIdentifier name, final Map peerAddresses,
final DatastoreContext datastoreContext, final SchemaContext schemaContext) {
this.name = name;
this.peerAddresses = peerAddresses;
this.datastoreContext = datastoreContext;
this.schemaContext = schemaContext;
}
@Override
public Shard create() throws Exception {
return new Shard(name, peerAddresses, datastoreContext, schemaContext);
}
}
@VisibleForTesting
public ShardDataTree getDataStore() {
return store;
}
@VisibleForTesting
ShardStats getShardMBean() {
return shardMBean;
}
}