/*
* 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.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.Ticker;
import java.io.IOException;
import java.util.Collection;
import java.util.Collections;
import java.util.Map;
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.exceptions.NoShardLeaderException;
import org.opendaylight.controller.cluster.datastore.identifiers.ShardIdentifier;
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.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.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;
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.utils.Dispatchers;
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.RaftState;
import org.opendaylight.controller.cluster.raft.base.messages.FollowerInitialSyncUpStatus;
import org.opendaylight.controller.cluster.raft.messages.AppendEntriesReply;
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.DataValidationFailedException;
import org.opendaylight.yangtools.yang.data.api.schema.tree.TipProducingDataTree;
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;
/**
* 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 {
@VisibleForTesting
static final Object TX_COMMIT_TIMEOUT_CHECK_MESSAGE = new Object() {
@Override
public String toString() {
return "txCommitTimeoutCheck";
}
};
@VisibleForTesting
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;
/// 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);
private ShardSnapshot restoreFromSnapshot;
private final ShardTransactionMessageRetrySupport messageRetrySupport;
private final FrontendMetadata frontendMetadata = new FrontendMetadata();
protected Shard(final 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());
ShardDataTreeChangeListenerPublisherActorProxy treeChangeListenerPublisher =
new ShardDataTreeChangeListenerPublisherActorProxy(getContext(), name + "-DTCL-publisher");
ShardDataChangeListenerPublisherActorProxy dataChangeListenerPublisher =
new ShardDataChangeListenerPublisherActorProxy(getContext(), name + "-DCL-publisher");
if (builder.getDataTree() != null) {
store = new ShardDataTree(this, builder.getSchemaContext(), builder.getDataTree(),
treeChangeListenerPublisher, dataChangeListenerPublisher, name);
} else {
store = new ShardDataTree(this, builder.getSchemaContext(), builder.getTreeType(),
treeChangeListenerPublisher, dataChangeListenerPublisher, name);
}
shardMBean = ShardMBeanFactory.getShardStatsMBean(name.toString(),
datastoreContext.getDataStoreMXBeanType());
shardMBean.setShard(this);
if (isMetricsCaptureEnabled()) {
getContext().become(new MeteringBehavior(this));
}
commitCoordinator = new ShardCommitCoordinator(store, 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 = ShardSnapshotCohort.create(getContext(), builder.getId().getMemberName(), store, LOG,
this.name);
messageRetrySupport = new ShardTransactionMessageRetrySupport(this);
}
private void setTransactionCommitTimeout() {
transactionCommitTimeout = TimeUnit.MILLISECONDS.convert(
datastoreContext.getShardTransactionCommitTimeoutInSeconds(), TimeUnit.SECONDS) / 2;
}
private Optional createRoleChangeNotifier(final 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();
messageRetrySupport.close();
if (txCommitTimeoutCheckSchedule != null) {
txCommitTimeoutCheckSchedule.cancel();
}
commitCoordinator.abortPendingTransactions("Transaction aborted due to shutdown.", this);
shardMBean.unregisterMBean();
}
@Override
protected void handleRecover(final Object message) {
LOG.debug("{}: onReceiveRecover: Received message {} from {}", persistenceId(), message.getClass(),
getSender());
super.handleRecover(message);
if (LOG.isTraceEnabled()) {
appendEntriesReplyTracker.begin();
}
}
@Override
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());
}
if (CreateTransaction.isSerializedType(message)) {
handleCreateTransaction(message);
} else if (message instanceof BatchedModifications) {
handleBatchedModifications((BatchedModifications)message);
} else if (message instanceof ForwardedReadyTransaction) {
handleForwardedReadyTransaction((ForwardedReadyTransaction) message);
} else if (message instanceof ReadyLocalTransaction) {
handleReadyLocalTransaction((ReadyLocalTransaction)message);
} else if (CanCommitTransaction.isSerializedType(message)) {
handleCanCommitTransaction(CanCommitTransaction.fromSerializable(message));
} else if (CommitTransaction.isSerializedType(message)) {
handleCommitTransaction(CommitTransaction.fromSerializable(message));
} else if (AbortTransaction.isSerializedType(message)) {
handleAbortTransaction(AbortTransaction.fromSerializable(message));
} else if (CloseTransactionChain.isSerializedType(message)) {
closeTransactionChain(CloseTransactionChain.fromSerializable(message));
} else if (message instanceof RegisterChangeListener) {
changeSupport.onMessage((RegisterChangeListener) message, isLeader(), hasLeader());
} else if (message instanceof RegisterDataTreeChangeListener) {
treeChangeSupport.onMessage((RegisterDataTreeChangeListener) message, isLeader(), hasLeader());
} 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 (TX_COMMIT_TIMEOUT_CHECK_MESSAGE.equals(message)) {
store.checkForExpiredTransactions(transactionCommitTimeout);
commitCoordinator.checkForExpiredTransactions(transactionCommitTimeout, this);
} 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 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) {
store.processCohortRegistryCommand(getSender(),
(DataTreeCohortActorRegistry.CohortRegistryCommand) message);
} else {
super.handleNonRaftCommand(message);
}
}
}
private boolean hasLeader() {
return getLeaderId() != null;
}
public int getPendingTxCommitQueueSize() {
return store.getQueueSize();
}
public int getCohortCacheSize() {
return commitCoordinator.getCohortCacheSize();
}
@Override
protected Optional getRoleChangeNotifier() {
return roleChangeNotifier;
}
@Override
protected LeaderStateChanged newLeaderStateChanged(final String memberId, final String leaderId,
final short leaderPayloadVersion) {
return isLeader() ? new ShardLeaderStateChanged(memberId, leaderId, store.getDataTree(), leaderPayloadVersion)
: new ShardLeaderStateChanged(memberId, leaderId, leaderPayloadVersion);
}
protected void onDatastoreContext(final DatastoreContext context) {
datastoreContext = context;
setTransactionCommitTimeout();
setPersistence(datastoreContext.isPersistent());
updateConfigParams(datastoreContext.getShardRaftConfig());
}
boolean canSkipPayload() {
// If we do not have any followers and we are not using persistence we can apply modification to the state
// immediately
return !hasFollowers() && !persistence().isRecoveryApplicable();
}
// applyState() will be invoked once consensus is reached on the payload
void persistPayload(final TransactionIdentifier transactionId, final Payload payload) {
// We are faking the sender
persistData(self(), transactionId, payload);
}
private void handleCommitTransaction(final CommitTransaction commit) {
if (isLeader()) {
commitCoordinator.handleCommit(commit.getTransactionID(), getSender(), this);
} 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 handleCanCommitTransaction(final CanCommitTransaction canCommit) {
LOG.debug("{}: Can committing transaction {}", persistenceId(), canCommit.getTransactionID());
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());
}
}
}
@SuppressWarnings("checkstyle:IllegalCatch")
protected void handleBatchedModificationsLocal(final BatchedModifications batched, final ActorRef sender) {
try {
commitCoordinator.handleBatchedModifications(batched, sender, this);
} catch (Exception e) {
LOG.error("{}: Error handling BatchedModifications for Tx {}", persistenceId(),
batched.getTransactionID(), e);
sender.tell(new akka.actor.Status.Failure(e), getSelf());
}
}
private void handleBatchedModifications(final 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.
//
boolean isLeaderActive = isLeaderActive();
if (isLeader() && isLeaderActive) {
handleBatchedModificationsLocal(batched, getSender());
} else {
ActorSelection leader = getLeader();
if (!isLeaderActive || leader == null) {
messageRetrySupport.addMessageToRetry(batched, getSender(),
"Could not commit transaction " + batched.getTransactionID());
} else {
// 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());
}
}
}
}
private boolean failIfIsolatedLeader(final ActorRef sender) {
if (isIsolatedLeader()) {
sender.tell(new akka.actor.Status.Failure(new NoShardLeaderException(String.format(
"Shard %s was the leader but has lost contact with all of its followers. Either all"
+ " other follower nodes are down or this node is isolated by a network partition.",
persistenceId()))), getSelf());
return true;
}
return false;
}
protected boolean isIsolatedLeader() {
return getRaftState() == RaftState.IsolatedLeader;
}
@SuppressWarnings("checkstyle:IllegalCatch")
private void handleReadyLocalTransaction(final ReadyLocalTransaction message) {
LOG.debug("{}: handleReadyLocalTransaction for {}", persistenceId(), message.getTransactionID());
boolean isLeaderActive = isLeaderActive();
if (isLeader() && isLeaderActive) {
try {
commitCoordinator.handleReadyLocalTransaction(message, getSender(), this);
} catch (Exception e) {
LOG.error("{}: Error handling ReadyLocalTransaction for Tx {}", persistenceId(),
message.getTransactionID(), e);
getSender().tell(new akka.actor.Status.Failure(e), getSelf());
}
} else {
ActorSelection leader = getLeader();
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(final ForwardedReadyTransaction forwardedReady) {
LOG.debug("{}: handleForwardedReadyTransaction for {}", persistenceId(), forwardedReady.getTransactionID());
boolean isLeaderActive = isLeaderActive();
if (isLeader() && isLeaderActive) {
commitCoordinator.handleForwardedReadyTransaction(forwardedReady, getSender(), this);
} else {
ActorSelection leader = getLeader();
if (!isLeaderActive || leader == null) {
messageRetrySupport.addMessageToRetry(forwardedReady, getSender(),
"Could not commit transaction " + forwardedReady.getTransactionID());
} else {
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());
}
}
}
private void handleAbortTransaction(final AbortTransaction abort) {
doAbortTransaction(abort.getTransactionID(), getSender());
}
void doAbortTransaction(final TransactionIdentifier transactionID, final ActorRef sender) {
commitCoordinator.handleAbort(transactionID, sender, this);
}
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(
"Could not create a shard transaction", persistenceId())), getSelf());
}
}
private void closeTransactionChain(final CloseTransactionChain closeTransactionChain) {
store.closeTransactionChain(closeTransactionChain.getIdentifier());
}
@SuppressWarnings("checkstyle:IllegalCatch")
private void createTransaction(final CreateTransaction createTransaction) {
try {
if (TransactionType.fromInt(createTransaction.getTransactionType()) != TransactionType.READ_ONLY
&& failIfIsolatedLeader(getSender())) {
return;
}
ActorRef transactionActor = createTransaction(createTransaction.getTransactionType(),
createTransaction.getTransactionId());
getSender().tell(new CreateTransactionReply(Serialization.serializedActorPath(transactionActor),
createTransaction.getTransactionId(), createTransaction.getVersion()).toSerializable(), getSelf());
} catch (Exception e) {
getSender().tell(new akka.actor.Status.Failure(e), getSelf());
}
}
private ActorRef createTransaction(final int transactionType, final TransactionIdentifier transactionId) {
LOG.debug("{}: Creating transaction : {} ", persistenceId(), transactionId);
return transactionActorFactory.newShardTransaction(TransactionType.fromInt(transactionType),
transactionId);
}
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
@VisibleForTesting
public RaftActorSnapshotCohort getRaftActorSnapshotCohort() {
return snapshotCohort;
}
@Override
@Nonnull
protected RaftActorRecoveryCohort getRaftActorRecoveryCohort() {
return new ShardRecoveryCoordinator(store,
restoreFromSnapshot != null ? restoreFromSnapshot.getSnapshot() : null, persistenceId(), LOG);
}
@Override
protected void onRecoveryComplete() {
restoreFromSnapshot = null;
//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 Identifier identifier, final Object data) {
if (data instanceof Payload) {
try {
store.applyReplicatedPayload(identifier, (Payload)data);
} catch (DataValidationFailedException | IOException e) {
LOG.error("{}: Error applying replica {}", persistenceId(), identifier, e);
}
} else {
LOG.error("{}: Unknown state for {} received {}", persistenceId(), identifier, data);
}
}
@Override
protected void onStateChanged() {
boolean isLeader = isLeader();
boolean hasLeader = hasLeader();
changeSupport.onLeadershipChange(isLeader, hasLeader);
treeChangeSupport.onLeadershipChange(isLeader, hasLeader);
// 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();
}
if (hasLeader && !isIsolatedLeader()) {
messageRetrySupport.retryMessages();
}
}
@Override
protected void onLeaderChanged(final String oldLeader, final 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 = convertPendingTransactionsToMessages();
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();
}
}
/**
* Clears all pending transactions and converts them to messages to be forwarded to a new leader.
*
* @return the converted messages
*/
public Collection> convertPendingTransactionsToMessages() {
return commitCoordinator.convertPendingTransactionsToMessages(
datastoreContext.getShardBatchedModificationCount());
}
@Override
protected void pauseLeader(final Runnable operation) {
LOG.debug("{}: In pauseLeader, operation: {}", persistenceId(), operation);
store.setRunOnPendingTransactionsComplete(operation);
}
@Override
public String persistenceId() {
return this.name;
}
@VisibleForTesting
ShardCommitCoordinator getCommitCoordinator() {
return commitCoordinator;
}
public DatastoreContext getDatastoreContext() {
return datastoreContext;
}
@VisibleForTesting
public ShardDataTree getDataStore() {
return store;
}
@VisibleForTesting
ShardStats getShardMBean() {
return shardMBean;
}
public static Builder builder() {
return new Builder();
}
public abstract static class AbstractBuilder, S extends Shard> {
private final Class shardClass;
private ShardIdentifier id;
private Map peerAddresses = Collections.emptyMap();
private DatastoreContext datastoreContext;
private SchemaContext schemaContext;
private DatastoreSnapshot.ShardSnapshot restoreFromSnapshot;
private TipProducingDataTree dataTree;
private volatile boolean sealed;
protected AbstractBuilder(final Class shardClass) {
this.shardClass = shardClass;
}
protected void checkSealed() {
Preconditions.checkState(!sealed, "Builder isalready sealed - further modifications are not allowed");
}
@SuppressWarnings("unchecked")
private T self() {
return (T) this;
}
public T id(final ShardIdentifier newId) {
checkSealed();
this.id = newId;
return self();
}
public T peerAddresses(final Map newPeerAddresses) {
checkSealed();
this.peerAddresses = newPeerAddresses;
return self();
}
public T datastoreContext(final DatastoreContext newDatastoreContext) {
checkSealed();
this.datastoreContext = newDatastoreContext;
return self();
}
public T schemaContext(final SchemaContext newSchemaContext) {
checkSealed();
this.schemaContext = newSchemaContext;
return self();
}
public T restoreFromSnapshot(final DatastoreSnapshot.ShardSnapshot newRestoreFromSnapshot) {
checkSealed();
this.restoreFromSnapshot = newRestoreFromSnapshot;
return self();
}
public T dataTree(final TipProducingDataTree newDataTree) {
checkSealed();
this.dataTree = newDataTree;
return self();
}
public ShardIdentifier getId() {
return id;
}
public Map getPeerAddresses() {
return peerAddresses;
}
public DatastoreContext getDatastoreContext() {
return datastoreContext;
}
public SchemaContext getSchemaContext() {
return schemaContext;
}
public DatastoreSnapshot.ShardSnapshot getRestoreFromSnapshot() {
return restoreFromSnapshot;
}
public TipProducingDataTree getDataTree() {
return dataTree;
}
public TreeType getTreeType() {
switch (datastoreContext.getLogicalStoreType()) {
case CONFIGURATION:
return TreeType.CONFIGURATION;
case OPERATIONAL:
return TreeType.OPERATIONAL;
default:
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");
Preconditions.checkNotNull(datastoreContext, "dataStoreContext should not be null");
Preconditions.checkNotNull(schemaContext, "schemaContext should not be null");
}
public Props props() {
sealed = true;
verify();
return Props.create(shardClass, this);
}
}
public static class Builder extends AbstractBuilder {
private Builder() {
super(Shard.class);
}
}
Ticker ticker() {
return Ticker.systemTicker();
}
}