org.opendaylight.controller.cluster.datastore.Shard Maven / Gradle / Ivy
/*
* 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 static com.google.common.base.Preconditions.checkState;
import static com.google.common.base.Verify.verify;
import static com.google.common.base.Verify.verifyNotNull;
import static java.util.Objects.requireNonNull;
import akka.actor.ActorRef;
import akka.actor.ActorSelection;
import akka.actor.Cancellable;
import akka.actor.ExtendedActorSystem;
import akka.actor.PoisonPill;
import akka.actor.Props;
import akka.actor.Status;
import akka.actor.Status.Failure;
import akka.persistence.RecoveryCompleted;
import akka.persistence.SnapshotOffer;
import akka.serialization.JavaSerializer;
import akka.serialization.Serialization;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Ticker;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Range;
import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
import java.io.IOException;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.Optional;
import java.util.OptionalLong;
import java.util.concurrent.TimeUnit;
import org.eclipse.jdt.annotation.NonNull;
import org.eclipse.jdt.annotation.Nullable;
import org.opendaylight.controller.cluster.access.ABIVersion;
import org.opendaylight.controller.cluster.access.commands.ConnectClientRequest;
import org.opendaylight.controller.cluster.access.commands.ConnectClientSuccess;
import org.opendaylight.controller.cluster.access.commands.LocalHistoryRequest;
import org.opendaylight.controller.cluster.access.commands.NotLeaderException;
import org.opendaylight.controller.cluster.access.commands.OutOfSequenceEnvelopeException;
import org.opendaylight.controller.cluster.access.commands.TransactionRequest;
import org.opendaylight.controller.cluster.access.concepts.ClientIdentifier;
import org.opendaylight.controller.cluster.access.concepts.FrontendIdentifier;
import org.opendaylight.controller.cluster.access.concepts.LocalHistoryIdentifier;
import org.opendaylight.controller.cluster.access.concepts.Request;
import org.opendaylight.controller.cluster.access.concepts.RequestEnvelope;
import org.opendaylight.controller.cluster.access.concepts.RequestException;
import org.opendaylight.controller.cluster.access.concepts.RequestSuccess;
import org.opendaylight.controller.cluster.access.concepts.RetiredGenerationException;
import org.opendaylight.controller.cluster.access.concepts.RuntimeRequestException;
import org.opendaylight.controller.cluster.access.concepts.SliceableMessage;
import org.opendaylight.controller.cluster.access.concepts.TransactionIdentifier;
import org.opendaylight.controller.cluster.access.concepts.UnsupportedRequestException;
import org.opendaylight.controller.cluster.common.actor.CommonConfig;
import org.opendaylight.controller.cluster.common.actor.Dispatchers;
import org.opendaylight.controller.cluster.common.actor.Dispatchers.DispatcherType;
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.actors.JsonExportActor;
import org.opendaylight.controller.cluster.datastore.exceptions.NoShardLeaderException;
import org.opendaylight.controller.cluster.datastore.identifiers.ShardIdentifier;
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.DataTreeChangedReply;
import org.opendaylight.controller.cluster.datastore.messages.ForwardedReadyTransaction;
import org.opendaylight.controller.cluster.datastore.messages.GetKnownClients;
import org.opendaylight.controller.cluster.datastore.messages.GetKnownClientsReply;
import org.opendaylight.controller.cluster.datastore.messages.GetShardDataTree;
import org.opendaylight.controller.cluster.datastore.messages.MakeLeaderLocal;
import org.opendaylight.controller.cluster.datastore.messages.OnDemandShardState;
import org.opendaylight.controller.cluster.datastore.messages.PeerAddressResolved;
import org.opendaylight.controller.cluster.datastore.messages.ReadyLocalTransaction;
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.persisted.DatastoreSnapshot;
import org.opendaylight.controller.cluster.datastore.persisted.DatastoreSnapshot.ShardSnapshot;
import org.opendaylight.controller.cluster.datastore.persisted.DisableTrackingPayload;
import org.opendaylight.controller.cluster.messaging.MessageAssembler;
import org.opendaylight.controller.cluster.messaging.MessageSlicer;
import org.opendaylight.controller.cluster.messaging.SliceOptions;
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.LeadershipTransferFailedException;
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.ReplicatedLogEntry;
import org.opendaylight.controller.cluster.raft.base.messages.FollowerInitialSyncUpStatus;
import org.opendaylight.controller.cluster.raft.client.messages.OnDemandRaftState;
import org.opendaylight.controller.cluster.raft.messages.AppendEntriesReply;
import org.opendaylight.controller.cluster.raft.messages.Payload;
import org.opendaylight.controller.cluster.raft.messages.RequestLeadership;
import org.opendaylight.controller.cluster.raft.messages.ServerRemoved;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.controller.config.distributed.datastore.provider.rev140612.DataStoreProperties.ExportOnRecovery;
import org.opendaylight.yangtools.concepts.Identifier;
import org.opendaylight.yangtools.yang.data.tree.api.DataTree;
import org.opendaylight.yangtools.yang.data.tree.api.DataValidationFailedException;
import org.opendaylight.yangtools.yang.data.tree.api.TreeType;
import org.opendaylight.yangtools.yang.model.api.EffectiveModelContext;
import org.opendaylight.yangtools.yang.model.api.EffectiveModelContextProvider;
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
*/
// FIXME: non-final for testing?
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";
}
};
static final Object RESUME_NEXT_PENDING_TRANSACTION = new Object() {
@Override
public String toString() {
return "resumeNextPendingTransaction";
}
};
// 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";
private static final Collection SUPPORTED_ABIVERSIONS;
// Make sure to keep this in sync with the journal configuration in factory-akka.conf
public static final String NON_PERSISTENT_JOURNAL_ID = "akka.persistence.non-persistent.journal";
static {
final ABIVersion[] values = ABIVersion.values();
final ABIVersion[] real = Arrays.copyOfRange(values, 1, values.length - 1);
SUPPORTED_ABIVERSIONS = ImmutableList.copyOf(real).reverse();
}
// FIXME: make this a dynamic property based on mailbox size and maximum number of clients
private static final int CLIENT_MAX_MESSAGES = 1000;
// The state of this Shard
private final ShardDataTree store;
/// The name of this shard
private final String name;
private final String shardName;
private final ShardStats shardMBean;
private final ShardDataTreeListenerInfoMXBeanImpl listenerInfoMXBean;
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 ShardSnapshot restoreFromSnapshot;
private final ShardTransactionMessageRetrySupport messageRetrySupport;
@VisibleForTesting
final FrontendMetadata frontendMetadata;
private Map knownFrontends = ImmutableMap.of();
private boolean paused;
private final MessageSlicer responseMessageSlicer;
private final Dispatchers dispatchers;
private final MessageAssembler requestMessageAssembler;
private final ExportOnRecovery exportOnRecovery;
private final ActorRef exportActor;
@SuppressFBWarnings(value = "MC_OVERRIDABLE_METHOD_CALL_IN_CONSTRUCTOR", justification = "Akka class design")
Shard(final AbstractBuilder builder) {
super(builder.getId().toString(), builder.getPeerAddresses(),
Optional.of(builder.getDatastoreContext().getShardRaftConfig()), DataStoreVersions.CURRENT_VERSION);
name = builder.getId().toString();
shardName = builder.getId().getShardName();
datastoreContext = builder.getDatastoreContext();
restoreFromSnapshot = builder.getRestoreFromSnapshot();
frontendMetadata = new FrontendMetadata(name);
exportOnRecovery = datastoreContext.getExportOnRecovery();
exportActor = switch (exportOnRecovery) {
case Json -> getContext().actorOf(JsonExportActor.props(builder.getSchemaContext(),
datastoreContext.getRecoveryExportBaseDir()));
case Off -> null;
};
setPersistence(datastoreContext.isPersistent());
LOG.info("Shard created : {}, persistent : {}", name, datastoreContext.isPersistent());
ShardDataTreeChangeListenerPublisherActorProxy treeChangeListenerPublisher =
new ShardDataTreeChangeListenerPublisherActorProxy(getContext(), name + "-DTCL-publisher", name);
if (builder.getDataTree() != null) {
store = new ShardDataTree(this, builder.getSchemaContext(), builder.getDataTree(),
treeChangeListenerPublisher, name,
frontendMetadata);
} else {
store = new ShardDataTree(this, builder.getSchemaContext(), builder.getTreeType(),
builder.getDatastoreContext().getStoreRoot(), treeChangeListenerPublisher, name,
frontendMetadata);
}
shardMBean = ShardStats.create(name, datastoreContext.getDataStoreMXBeanType(), this);
if (isMetricsCaptureEnabled()) {
getContext().become(new MeteringBehavior(this));
}
commitCoordinator = new ShardCommitCoordinator(store, LOG, name);
setTransactionCommitTimeout();
// create a notifier actor for each cluster member
roleChangeNotifier = createRoleChangeNotifier(name);
appendEntriesReplyTracker = new MessageTracker(AppendEntriesReply.class,
getRaftActorContext().getConfigParams().getIsolatedCheckIntervalInMillis());
dispatchers = new Dispatchers(context().system().dispatchers());
transactionActorFactory = new ShardTransactionActorFactory(store, datastoreContext,
dispatchers.getDispatcherPath(Dispatchers.DispatcherType.Transaction),
self(), getContext(), shardMBean, builder.getId().getShardName());
snapshotCohort = ShardSnapshotCohort.create(getContext(), builder.getId().getMemberName(), store, LOG,
name, datastoreContext);
messageRetrySupport = new ShardTransactionMessageRetrySupport(this);
responseMessageSlicer = MessageSlicer.builder().logContext(name)
.messageSliceSize(datastoreContext.getMaximumMessageSliceSize())
.fileBackedStreamFactory(getRaftActorContext().getFileBackedOutputStreamFactory())
.expireStateAfterInactivity(2, TimeUnit.MINUTES).build();
requestMessageAssembler = MessageAssembler.builder().logContext(name)
.fileBackedStreamFactory(getRaftActorContext().getFileBackedOutputStreamFactory())
.assembledMessageCallback((message, sender) -> self().tell(message, sender))
.expireStateAfterInactivity(datastoreContext.getRequestTimeout(), TimeUnit.NANOSECONDS).build();
listenerInfoMXBean = new ShardDataTreeListenerInfoMXBeanImpl(name, datastoreContext.getDataStoreMXBeanType(),
self());
listenerInfoMXBean.register();
}
private void setTransactionCommitTimeout() {
transactionCommitTimeout = TimeUnit.MILLISECONDS.convert(
datastoreContext.getShardTransactionCommitTimeoutInSeconds(), TimeUnit.SECONDS) / 2;
}
private Optional createRoleChangeNotifier(final String shardId) {
ActorRef shardRoleChangeNotifier = getContext().actorOf(
RoleChangeNotifier.getProps(shardId), shardId + "-notifier");
return Optional.of(shardRoleChangeNotifier);
}
@Override
public final void postStop() throws Exception {
LOG.info("Stopping Shard {}", persistenceId());
super.postStop();
messageRetrySupport.close();
if (txCommitTimeoutCheckSchedule != null) {
txCommitTimeoutCheckSchedule.cancel();
}
commitCoordinator.abortPendingTransactions("Transaction aborted due to shutdown.", this);
shardMBean.unregisterMBean();
listenerInfoMXBean.unregister();
}
@Override
protected final void handleRecover(final Object message) {
LOG.debug("{}: onReceiveRecover: Received message {} from {}", persistenceId(), message.getClass(),
getSender());
super.handleRecover(message);
switch (exportOnRecovery) {
case Json:
if (message instanceof SnapshotOffer) {
exportActor.tell(new JsonExportActor.ExportSnapshot(store.readCurrentData().orElseThrow(), name),
ActorRef.noSender());
} else if (message instanceof ReplicatedLogEntry) {
exportActor.tell(new JsonExportActor.ExportJournal((ReplicatedLogEntry) message),
ActorRef.noSender());
} else if (message instanceof RecoveryCompleted) {
exportActor.tell(new JsonExportActor.FinishExport(name), ActorRef.noSender());
exportActor.tell(PoisonPill.getInstance(), ActorRef.noSender());
}
break;
case Off:
default:
break;
}
if (LOG.isTraceEnabled()) {
appendEntriesReplyTracker.begin();
}
}
@Override
// non-final for TestShard
protected void handleNonRaftCommand(final Object message) {
try (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.orElseThrow());
}
store.resetTransactionBatch();
if (message instanceof RequestEnvelope) {
handleRequestEnvelope((RequestEnvelope)message);
} else if (MessageAssembler.isHandledMessage(message)) {
handleRequestAssemblerMessage(message);
} else if (message instanceof ConnectClientRequest) {
handleConnectClient((ConnectClientRequest)message);
} else 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 DataTreeChangedReply) {
// Ignore reply
} else if (message instanceof RegisterDataTreeChangeListener) {
treeChangeSupport.onMessage((RegisterDataTreeChangeListener) message, isLeader(), hasLeader());
} else if (message instanceof UpdateSchemaContext) {
updateSchemaContext((UpdateSchemaContext) message);
} else if (message instanceof PeerAddressResolved resolved) {
setPeerAddress(resolved.getPeerId(), resolved.getPeerAddress());
} else if (TX_COMMIT_TIMEOUT_CHECK_MESSAGE.equals(message)) {
commitTimeoutCheck();
} else if (message instanceof DatastoreContext) {
onDatastoreContext((DatastoreContext)message);
} else if (message instanceof RegisterRoleChangeListener) {
roleChangeNotifier.orElseThrow().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 if (message instanceof MakeLeaderLocal) {
onMakeLeaderLocal();
} else if (RESUME_NEXT_PENDING_TRANSACTION.equals(message)) {
store.resumeNextPendingTransaction();
} else if (GetKnownClients.INSTANCE.equals(message)) {
handleGetKnownClients();
} else if (!responseMessageSlicer.handleMessage(message)) {
super.handleNonRaftCommand(message);
}
}
}
private void handleRequestAssemblerMessage(final Object message) {
dispatchers.getDispatcher(DispatcherType.Serialization).execute(() -> {
JavaSerializer.currentSystem().value_$eq((ExtendedActorSystem) context().system());
requestMessageAssembler.handleMessage(message, self());
});
}
@SuppressWarnings("checkstyle:IllegalCatch")
private void handleRequestEnvelope(final RequestEnvelope envelope) {
final long now = ticker().read();
try {
final RequestSuccess success = handleRequest(envelope, now);
if (success != null) {
final long executionTimeNanos = ticker().read() - now;
if (success instanceof SliceableMessage) {
dispatchers.getDispatcher(DispatcherType.Serialization).execute(() ->
responseMessageSlicer.slice(SliceOptions.builder().identifier(success.getTarget())
.message(envelope.newSuccessEnvelope(success, executionTimeNanos))
.sendTo(envelope.getMessage().getReplyTo()).replyTo(self())
.onFailureCallback(t -> LOG.warn("Error slicing response {}", success, t)).build()));
} else {
envelope.sendSuccess(success, executionTimeNanos);
}
}
} catch (RequestException e) {
LOG.debug("{}: request {} failed", persistenceId(), envelope, e);
envelope.sendFailure(e, ticker().read() - now);
} catch (Exception e) {
LOG.debug("{}: request {} caused failure", persistenceId(), envelope, e);
envelope.sendFailure(new RuntimeRequestException("Request failed to process", e),
ticker().read() - now);
}
}
private void commitTimeoutCheck() {
store.checkForExpiredTransactions(transactionCommitTimeout, this::updateAccess);
commitCoordinator.checkForExpiredTransactions(transactionCommitTimeout, this);
requestMessageAssembler.checkExpiredAssembledMessageState();
}
private OptionalLong updateAccess(final SimpleShardDataTreeCohort cohort) {
final FrontendIdentifier frontend = cohort.getIdentifier().getHistoryId().getClientId().getFrontendId();
final LeaderFrontendState state = knownFrontends.get(frontend);
if (state == null) {
// Not tell-based protocol, do nothing
return OptionalLong.empty();
}
if (isIsolatedLeader()) {
// We are isolated and no new request can come through until we emerge from it. We are still updating
// liveness of frontend when we see it attempting to communicate. Use the last access timer.
return OptionalLong.of(state.getLastSeenTicks());
}
// If this frontend has freshly connected, give it some time to catch up before killing its transactions.
return OptionalLong.of(state.getLastConnectTicks());
}
private void disableTracking(final DisableTrackingPayload payload) {
final ClientIdentifier clientId = payload.getIdentifier();
LOG.debug("{}: disabling tracking of {}", persistenceId(), clientId);
frontendMetadata.disableTracking(clientId);
if (isLeader()) {
final FrontendIdentifier frontendId = clientId.getFrontendId();
final LeaderFrontendState frontend = knownFrontends.get(frontendId);
if (frontend != null) {
if (clientId.equals(frontend.getIdentifier())) {
if (!(frontend instanceof LeaderFrontendState.Disabled)) {
verify(knownFrontends.replace(frontendId, frontend,
new LeaderFrontendState.Disabled(persistenceId(), clientId, store)));
LOG.debug("{}: leader state for {} disabled", persistenceId(), clientId);
} else {
LOG.debug("{}: leader state {} is already disabled", persistenceId(), frontend);
}
} else {
LOG.debug("{}: leader state {} does not match {}", persistenceId(), frontend, clientId);
}
} else {
LOG.debug("{}: leader state for {} not found", persistenceId(), clientId);
knownFrontends.put(frontendId, new LeaderFrontendState.Disabled(persistenceId(), clientId,
getDataStore()));
}
}
}
private void onMakeLeaderLocal() {
LOG.debug("{}: onMakeLeaderLocal received", persistenceId());
if (isLeader()) {
getSender().tell(new Status.Success(null), getSelf());
return;
}
final ActorSelection leader = getLeader();
if (leader == null) {
// Leader is not present. The cluster is most likely trying to
// elect a leader and we should let that run its normal course
// TODO we can wait for the election to complete and retry the
// request. We can also let the caller retry by sending a flag
// in the response indicating the request is "reTryable".
getSender().tell(new Failure(
new LeadershipTransferFailedException("We cannot initiate leadership transfer to local node. "
+ "Currently there is no leader for " + persistenceId())),
getSelf());
return;
}
leader.tell(new RequestLeadership(getId(), getSender()), getSelf());
}
// Acquire our frontend tracking handle and verify generation matches
private @Nullable LeaderFrontendState findFrontend(final ClientIdentifier clientId) throws RequestException {
final LeaderFrontendState existing = knownFrontends.get(clientId.getFrontendId());
if (existing != null) {
final int cmp = Long.compareUnsigned(existing.getIdentifier().getGeneration(), clientId.getGeneration());
if (cmp == 0) {
existing.touch();
return existing;
}
if (cmp > 0) {
LOG.debug("{}: rejecting request from outdated client {}", persistenceId(), clientId);
throw new RetiredGenerationException(clientId.getGeneration(),
existing.getIdentifier().getGeneration());
}
LOG.info("{}: retiring state {}, outdated by request from client {}", persistenceId(), existing, clientId);
existing.retire();
knownFrontends.remove(clientId.getFrontendId());
} else {
LOG.debug("{}: client {} is not yet known", persistenceId(), clientId);
}
return null;
}
private LeaderFrontendState getFrontend(final ClientIdentifier clientId) throws RequestException {
final LeaderFrontendState ret = findFrontend(clientId);
if (ret != null) {
return ret;
}
// TODO: a dedicated exception would be better, but this is technically true, too
throw new OutOfSequenceEnvelopeException(0);
}
private static @NonNull ABIVersion selectVersion(final ConnectClientRequest message) {
final Range clientRange = Range.closed(message.getMinVersion(), message.getMaxVersion());
for (ABIVersion v : SUPPORTED_ABIVERSIONS) {
if (clientRange.contains(v)) {
return v;
}
}
throw new IllegalArgumentException(String.format(
"No common version between backend versions %s and client versions %s", SUPPORTED_ABIVERSIONS,
clientRange));
}
@SuppressWarnings("checkstyle:IllegalCatch")
private void handleConnectClient(final ConnectClientRequest message) {
try {
final ClientIdentifier clientId = message.getTarget();
final LeaderFrontendState existing = findFrontend(clientId);
if (existing != null) {
existing.touch();
}
if (!isLeader() || !isLeaderActive()) {
LOG.info("{}: not currently leader, rejecting request {}. isLeader: {}, isLeaderActive: {},"
+ "isLeadershipTransferInProgress: {}.",
persistenceId(), message, isLeader(), isLeaderActive(), isLeadershipTransferInProgress());
throw new NotLeaderException(getSelf());
}
final ABIVersion selectedVersion = selectVersion(message);
final LeaderFrontendState frontend;
if (existing == null) {
frontend = new LeaderFrontendState.Enabled(persistenceId(), clientId, store);
knownFrontends.put(clientId.getFrontendId(), frontend);
LOG.debug("{}: created state {} for client {}", persistenceId(), frontend, clientId);
} else {
frontend = existing;
}
frontend.reconnect();
message.getReplyTo().tell(new ConnectClientSuccess(message.getTarget(), message.getSequence(), getSelf(),
ImmutableList.of(), store.getDataTree(), CLIENT_MAX_MESSAGES).toVersion(selectedVersion),
ActorRef.noSender());
} catch (RequestException | RuntimeException e) {
message.getReplyTo().tell(new Failure(e), ActorRef.noSender());
}
}
private @Nullable RequestSuccess handleRequest(final RequestEnvelope envelope, final long now)
throws RequestException {
// We are not the leader, hence we want to fail-fast.
if (!isLeader() || paused || !isLeaderActive()) {
LOG.debug("{}: not currently active leader, rejecting request {}. isLeader: {}, isLeaderActive: {},"
+ "isLeadershipTransferInProgress: {}, paused: {}",
persistenceId(), envelope, isLeader(), isLeaderActive(), isLeadershipTransferInProgress(), paused);
throw new NotLeaderException(getSelf());
}
final Request request = envelope.getMessage();
if (request instanceof TransactionRequest) {
final TransactionRequest txReq = (TransactionRequest)request;
final ClientIdentifier clientId = txReq.getTarget().getHistoryId().getClientId();
return getFrontend(clientId).handleTransactionRequest(txReq, envelope, now);
} else if (request instanceof LocalHistoryRequest) {
final LocalHistoryRequest lhReq = (LocalHistoryRequest)request;
final ClientIdentifier clientId = lhReq.getTarget().getClientId();
return getFrontend(clientId).handleLocalHistoryRequest(lhReq, envelope, now);
} else {
LOG.warn("{}: rejecting unsupported request {}", persistenceId(), request);
throw new UnsupportedRequestException(request);
}
}
private void handleGetKnownClients() {
final ImmutableSet clients;
if (isLeader()) {
clients = knownFrontends.values().stream()
.map(LeaderFrontendState::getIdentifier)
.collect(ImmutableSet.toImmutableSet());
} else {
clients = frontendMetadata.getClients();
}
sender().tell(new GetKnownClientsReply(clients), self());
}
private boolean hasLeader() {
return getLeaderId() != null;
}
final int getPendingTxCommitQueueSize() {
return store.getQueueSize();
}
final int getCohortCacheSize() {
return commitCoordinator.getCohortCacheSize();
}
@Override
protected final Optional getRoleChangeNotifier() {
return roleChangeNotifier;
}
final String getShardName() {
return shardName;
}
@Override
protected final 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);
}
private void onDatastoreContext(final DatastoreContext context) {
datastoreContext = verifyNotNull(context);
setTransactionCommitTimeout();
setPersistence(datastoreContext.isPersistent());
updateConfigParams(datastoreContext.getShardRaftConfig());
}
// applyState() will be invoked once consensus is reached on the payload
// non-final for mocking
void persistPayload(final Identifier id, final Payload payload, final boolean batchHint) {
final boolean canSkipPayload = !hasFollowers() && !persistence().isRecoveryApplicable();
if (canSkipPayload) {
applyState(self(), id, payload);
} else {
// We are faking the sender
persistData(self(), id, payload, batchHint);
}
}
private void handleCommitTransaction(final CommitTransaction commit) {
final TransactionIdentifier txId = commit.getTransactionId();
if (isLeader()) {
askProtocolEncountered(txId);
commitCoordinator.handleCommit(txId, getSender(), this);
} else {
ActorSelection leader = getLeader();
if (leader == null) {
messageRetrySupport.addMessageToRetry(commit, getSender(), "Could not commit transaction " + txId);
} else {
LOG.debug("{}: Forwarding CommitTransaction to leader {}", persistenceId(), leader);
leader.forward(commit, getContext());
}
}
}
private void handleCanCommitTransaction(final CanCommitTransaction canCommit) {
final TransactionIdentifier txId = canCommit.getTransactionId();
LOG.debug("{}: Can committing transaction {}", persistenceId(), txId);
if (isLeader()) {
askProtocolEncountered(txId);
commitCoordinator.handleCanCommit(txId, getSender(), this);
} else {
ActorSelection leader = getLeader();
if (leader == null) {
messageRetrySupport.addMessageToRetry(canCommit, getSender(),
"Could not canCommit transaction " + txId);
} else {
LOG.debug("{}: Forwarding CanCommitTransaction to leader {}", persistenceId(), leader);
leader.forward(canCommit, getContext());
}
}
}
@SuppressWarnings("checkstyle:IllegalCatch")
private void handleBatchedModificationsLocal(final BatchedModifications batched, final ActorRef sender) {
askProtocolEncountered(batched.getTransactionId());
try {
commitCoordinator.handleBatchedModifications(batched, sender, this);
} catch (Exception e) {
LOG.error("{}: Error handling BatchedModifications for Tx {}", persistenceId(),
batched.getTransactionId(), e);
sender.tell(new 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 process BatchedModifications " + 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 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) {
final TransactionIdentifier txId = message.getTransactionId();
LOG.debug("{}: handleReadyLocalTransaction for {}", persistenceId(), txId);
boolean isLeaderActive = isLeaderActive();
if (isLeader() && isLeaderActive) {
askProtocolEncountered(txId);
try {
commitCoordinator.handleReadyLocalTransaction(message, getSender(), this);
} catch (Exception e) {
LOG.error("{}: Error handling ReadyLocalTransaction for Tx {}", persistenceId(), txId, e);
getSender().tell(new Failure(e), getSelf());
}
} else {
ActorSelection leader = getLeader();
if (!isLeaderActive || leader == null) {
messageRetrySupport.addMessageToRetry(message, getSender(),
"Could not process ready local transaction " + txId);
} 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) {
askProtocolEncountered(forwardedReady.getTransactionId());
commitCoordinator.handleForwardedReadyTransaction(forwardedReady, getSender(), this);
} else {
ActorSelection leader = getLeader();
if (!isLeaderActive || leader == null) {
messageRetrySupport.addMessageToRetry(forwardedReady, getSender(),
"Could not process forwarded ready transaction " + forwardedReady.getTransactionId());
} else {
LOG.debug("{}: Forwarding ForwardedReadyTransaction to leader {}", persistenceId(), leader);
ReadyLocalTransaction readyLocal = new ReadyLocalTransaction(forwardedReady.getTransactionId(),
forwardedReady.getTransaction().getSnapshot(), forwardedReady.isDoImmediateCommit(),
forwardedReady.getParticipatingShardNames());
readyLocal.setRemoteVersion(getCurrentBehavior().getLeaderPayloadVersion());
leader.forward(readyLocal, getContext());
}
}
}
private void handleAbortTransaction(final AbortTransaction abort) {
final TransactionIdentifier transactionId = abort.getTransactionId();
askProtocolEncountered(transactionId);
doAbortTransaction(transactionId, getSender());
}
final void doAbortTransaction(final Identifier 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 Failure(new NoShardLeaderException(
"Could not create a shard transaction", persistenceId())), getSelf());
}
}
private void closeTransactionChain(final CloseTransactionChain closeTransactionChain) {
if (isLeader()) {
final LocalHistoryIdentifier id = closeTransactionChain.getIdentifier();
askProtocolEncountered(id.getClientId());
store.closeTransactionChain(id);
} else if (getLeader() != null) {
getLeader().forward(closeTransactionChain, getContext());
} else {
LOG.warn("{}: Could not close transaction {}", persistenceId(), closeTransactionChain.getIdentifier());
}
}
@SuppressWarnings("checkstyle:IllegalCatch")
private void createTransaction(final CreateTransaction createTransaction) {
askProtocolEncountered(createTransaction.getTransactionId());
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 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);
}
// Called on leader only
private void askProtocolEncountered(final TransactionIdentifier transactionId) {
askProtocolEncountered(transactionId.getHistoryId().getClientId());
}
// Called on leader only
private void askProtocolEncountered(final ClientIdentifier clientId) {
final FrontendIdentifier frontend = clientId.getFrontendId();
final LeaderFrontendState state = knownFrontends.get(frontend);
if (!(state instanceof LeaderFrontendState.Disabled)) {
LOG.debug("{}: encountered ask-based client {}, disabling transaction tracking", persistenceId(), clientId);
if (knownFrontends.isEmpty()) {
knownFrontends = new HashMap<>();
}
knownFrontends.put(frontend, new LeaderFrontendState.Disabled(persistenceId(), clientId, getDataStore()));
persistPayload(clientId, DisableTrackingPayload.create(clientId,
datastoreContext.getInitialPayloadSerializedBufferCapacity()), false);
}
}
private void updateSchemaContext(final UpdateSchemaContext message) {
updateSchemaContext(message.getEffectiveModelContext());
}
@VisibleForTesting
void updateSchemaContext(final @NonNull EffectiveModelContext schemaContext) {
store.updateSchemaContext(schemaContext);
}
private boolean isMetricsCaptureEnabled() {
CommonConfig config = new CommonConfig(getContext().system().settings().config());
return config.isMetricCaptureEnabled();
}
@Override
protected final RaftActorSnapshotCohort getRaftActorSnapshotCohort() {
return snapshotCohort;
}
@Override
protected final RaftActorRecoveryCohort getRaftActorRecoveryCohort() {
if (restoreFromSnapshot == null) {
return ShardRecoveryCoordinator.create(store, persistenceId(), LOG);
}
return ShardRecoveryCoordinator.forSnapshot(store, persistenceId(), LOG, restoreFromSnapshot.getSnapshot());
}
@Override
// non-final for testing
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 = FiniteDuration.create(transactionCommitTimeout / 3, TimeUnit.MILLISECONDS);
txCommitTimeoutCheckSchedule = getContext().system().scheduler().schedule(
period, period, getSelf(),
TX_COMMIT_TIMEOUT_CHECK_MESSAGE, getContext().dispatcher(), ActorRef.noSender());
}
}
@Override
protected final void applyState(final ActorRef clientActor, final Identifier identifier, final Object data) {
if (data instanceof Payload) {
if (data instanceof DisableTrackingPayload) {
disableTracking((DisableTrackingPayload) data);
return;
}
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 final void onStateChanged() {
boolean isLeader = isLeader();
boolean hasLeader = 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());
}
paused = false;
store.purgeLeaderState();
}
if (hasLeader && !isIsolatedLeader()) {
messageRetrySupport.retryMessages();
}
}
@Override
protected final void onLeaderChanged(final String oldLeader, final String newLeader) {
shardMBean.incrementLeadershipChangeCount();
paused = false;
if (!isLeader()) {
if (!knownFrontends.isEmpty()) {
LOG.debug("{}: removing frontend state for {}", persistenceId(), knownFrontends.keySet());
knownFrontends = ImmutableMap.of();
}
requestMessageAssembler.close();
if (!hasLeader()) {
// No leader anywhere, nothing else to do
return;
}
// 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) {
// Clears all pending transactions and converts them to messages to be forwarded to a new leader.
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) {
LOG.debug("{}: Forwarding pending transaction message {}", persistenceId(), message);
leader.tell(message, self());
}
}
} else {
commitCoordinator.abortPendingTransactions("The transacton was aborted due to inflight leadership "
+ "change and the leader address isn't available.", this);
}
} else {
// We have become the leader, we need to reconstruct frontend state
knownFrontends = verifyNotNull(frontendMetadata.toLeaderState(this));
LOG.debug("{}: became leader with frontend state for {}", persistenceId(), knownFrontends.keySet());
}
if (!isIsolatedLeader()) {
messageRetrySupport.retryMessages();
}
}
@Override
protected final void pauseLeader(final Runnable operation) {
LOG.debug("{}: In pauseLeader, operation: {}", persistenceId(), operation);
paused = true;
// Tell-based protocol can replay transaction state, so it is safe to blow it up when we are paused.
if (datastoreContext.isUseTellBasedProtocol()) {
knownFrontends.values().forEach(LeaderFrontendState::retire);
knownFrontends = ImmutableMap.of();
}
store.setRunOnPendingTransactionsComplete(operation);
}
@Override
protected final void unpauseLeader() {
LOG.debug("{}: In unpauseLeader", persistenceId());
paused = false;
store.setRunOnPendingTransactionsComplete(null);
// Restore tell-based protocol state as if we were becoming the leader
knownFrontends = verifyNotNull(frontendMetadata.toLeaderState(this));
}
@Override
protected final OnDemandRaftState.AbstractBuilder newOnDemandRaftStateBuilder() {
return OnDemandShardState.newBuilder()
.treeChangeListenerActors(treeChangeSupport.getListenerActors())
.commitCohortActors(store.getCohortActors());
}
@Override
public final String persistenceId() {
return name;
}
@Override
public final String journalPluginId() {
// This method may be invoked from super constructor (wonderful), hence we also need to handle the case of
// the field being uninitialized because our constructor is not finished.
if (datastoreContext != null && !datastoreContext.isPersistent()) {
return NON_PERSISTENT_JOURNAL_ID;
}
return super.journalPluginId();
}
@VisibleForTesting
final ShardCommitCoordinator getCommitCoordinator() {
return commitCoordinator;
}
// non-final for mocking
DatastoreContext getDatastoreContext() {
return datastoreContext;
}
@VisibleForTesting
final ShardDataTree getDataStore() {
return store;
}
@VisibleForTesting
// non-final for mocking
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 EffectiveModelContextProvider schemaContextProvider;
private DatastoreSnapshot.ShardSnapshot restoreFromSnapshot;
private DataTree dataTree;
private volatile boolean sealed;
AbstractBuilder(final Class shardClass) {
this.shardClass = shardClass;
}
final void checkSealed() {
checkState(!sealed, "Builder is already sealed - further modifications are not allowed");
}
@SuppressWarnings("unchecked")
private T self() {
return (T) this;
}
public T id(final ShardIdentifier newId) {
checkSealed();
id = newId;
return self();
}
public T peerAddresses(final Map newPeerAddresses) {
checkSealed();
peerAddresses = newPeerAddresses;
return self();
}
public T datastoreContext(final DatastoreContext newDatastoreContext) {
checkSealed();
datastoreContext = newDatastoreContext;
return self();
}
public T schemaContextProvider(final EffectiveModelContextProvider newSchemaContextProvider) {
checkSealed();
schemaContextProvider = requireNonNull(newSchemaContextProvider);
return self();
}
public T restoreFromSnapshot(final DatastoreSnapshot.ShardSnapshot newRestoreFromSnapshot) {
checkSealed();
restoreFromSnapshot = newRestoreFromSnapshot;
return self();
}
public T dataTree(final DataTree newDataTree) {
checkSealed();
dataTree = newDataTree;
return self();
}
public ShardIdentifier getId() {
return id;
}
public Map getPeerAddresses() {
return peerAddresses;
}
public DatastoreContext getDatastoreContext() {
return datastoreContext;
}
public EffectiveModelContext getSchemaContext() {
return verifyNotNull(schemaContextProvider.getEffectiveModelContext());
}
public DatastoreSnapshot.ShardSnapshot getRestoreFromSnapshot() {
return restoreFromSnapshot;
}
public DataTree getDataTree() {
return dataTree;
}
public TreeType getTreeType() {
return switch (datastoreContext.getLogicalStoreType()) {
case CONFIGURATION -> TreeType.CONFIGURATION;
case OPERATIONAL -> TreeType.OPERATIONAL;
};
}
protected void verify() {
requireNonNull(id, "id should not be null");
requireNonNull(peerAddresses, "peerAddresses should not be null");
requireNonNull(datastoreContext, "dataStoreContext should not be null");
requireNonNull(schemaContextProvider, "schemaContextProvider should not be null");
}
public Props props() {
sealed = true;
verify();
return Props.create(shardClass, this);
}
}
public static class Builder extends AbstractBuilder {
Builder() {
this(Shard.class);
}
Builder(final Class shardClass) {
super(shardClass);
}
}
Ticker ticker() {
return Ticker.systemTicker();
}
void scheduleNextPendingTransaction() {
self().tell(RESUME_NEXT_PENDING_TRANSACTION, ActorRef.noSender());
}
}