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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.flink.runtime.client;
import akka.actor.ActorRef;
import akka.actor.Cancellable;
import akka.actor.PoisonPill;
import akka.actor.Status;
import akka.actor.Terminated;
import akka.dispatch.OnSuccess;
import org.apache.flink.runtime.akka.AkkaUtils;
import org.apache.flink.runtime.akka.FlinkUntypedActor;
import org.apache.flink.runtime.jobgraph.JobStatus;
import org.apache.flink.runtime.leaderretrieval.LeaderRetrievalListener;
import org.apache.flink.runtime.leaderretrieval.LeaderRetrievalService;
import org.apache.flink.runtime.messages.ExecutionGraphMessages;
import org.apache.flink.runtime.messages.JobClientMessages;
import org.apache.flink.runtime.messages.JobClientMessages.JobManagerActorRef;
import org.apache.flink.runtime.messages.JobClientMessages.JobManagerLeaderAddress;
import org.apache.flink.runtime.messages.JobManagerMessages;
import org.apache.flink.util.SerializedThrowable;
import org.apache.flink.util.Preconditions;
import scala.concurrent.duration.FiniteDuration;
import java.util.Objects;
import java.util.UUID;
/**
* Actor which constitutes the bridge between the non-actor code and the JobManager.
* This base class handles the connection to the JobManager and notifies in case of timeouts. It also
* receives and prints job updates until job completion.
*/
public abstract class JobClientActor extends FlinkUntypedActor implements LeaderRetrievalListener {
private final LeaderRetrievalService leaderRetrievalService;
/** timeout for futures */
protected final FiniteDuration timeout;
/** true if status messages shall be printed to sysout */
private final boolean sysoutUpdates;
/** true if a PoisonPill about to be taken */
private boolean toBeTerminated = false;
/** ActorRef to the current leader */
protected ActorRef jobManager;
/** leader session ID of the JobManager when this actor was created */
protected UUID leaderSessionID;
/** The client which the actor is responsible for */
protected ActorRef client;
private Cancellable connectionTimeout;
private UUID connectionTimeoutId;
public JobClientActor(
LeaderRetrievalService leaderRetrievalService,
FiniteDuration timeout,
boolean sysoutUpdates) {
this.leaderRetrievalService = Preconditions.checkNotNull(leaderRetrievalService);
this.timeout = Preconditions.checkNotNull(timeout);
this.sysoutUpdates = sysoutUpdates;
this.jobManager = ActorRef.noSender();
this.leaderSessionID = null;
connectionTimeout = null;
connectionTimeoutId = null;
}
@Override
public void preStart() {
try {
leaderRetrievalService.start(this);
} catch (Exception e) {
LOG.error("Could not start the leader retrieval service.");
throw new RuntimeException("Could not start the leader retrieval service.", e);
}
}
@Override
public void postStop() {
try {
leaderRetrievalService.stop();
} catch (Exception e) {
LOG.warn("Could not properly stop the leader retrieval service.");
}
}
/**
* Hook to be called once a connection has been established with the JobManager.
*/
protected abstract void connectedToJobManager();
/**
* Hook to handle custom client message which are not handled by the base class.
* @param message The message to be handled
*/
protected abstract void handleCustomMessage(Object message);
/**
* Hook to let the client know about messages that should start a timer for a timeout
* @return The message class after which a timeout should be started
*/
protected abstract Class getClientMessageClass();
@Override
protected void handleMessage(Object message) {
// =========== State Change Messages ===============
if (message instanceof ExecutionGraphMessages.ExecutionStateChanged) {
logAndPrintMessage((ExecutionGraphMessages.ExecutionStateChanged) message);
} else if (message instanceof ExecutionGraphMessages.JobStatusChanged) {
logAndPrintMessage((ExecutionGraphMessages.JobStatusChanged) message);
}
// ============ JobManager ActorRef resolution ===============
else if (message instanceof JobManagerLeaderAddress) {
JobManagerLeaderAddress msg = (JobManagerLeaderAddress) message;
if (jobManager != null) {
// only print this message when we had been connected to a JobManager before
logAndPrintMessage("New JobManager elected. Connecting to " + msg.address());
}
disconnectFromJobManager();
this.leaderSessionID = msg.leaderSessionID();
if (msg.address() != null) {
// Resolve the job manager leader address to obtain an ActorRef
AkkaUtils.getActorRefFuture(msg.address(), getContext().system(), timeout)
.onSuccess(new OnSuccess() {
@Override
public void onSuccess(ActorRef result) throws Throwable {
getSelf().tell(decorateMessage(new JobManagerActorRef(result)), ActorRef.noSender());
}
}, getContext().dispatcher());
} else if (isClientConnected() && connectionTimeoutId == null) {
// msg.address == null means that the leader has lost its leadership
registerConnectionTimeout();
}
} else if (message instanceof JobManagerActorRef) {
// Resolved JobManager ActorRef
JobManagerActorRef msg = (JobManagerActorRef) message;
connectToJobManager(msg.jobManager());
logAndPrintMessage("Connected to JobManager at " + msg.jobManager() +
" with leader session id " + leaderSessionID + '.');
connectedToJobManager();
}
// =========== Job Life Cycle Messages ===============
// acknowledgement to submit job is only logged, our original
// client is only interested in the final job result
else if (message instanceof JobManagerMessages.JobResultMessage) {
if (LOG.isDebugEnabled()) {
LOG.debug("Received {} message from JobManager", message.getClass().getSimpleName());
}
// forward the success to the original client
if (isClientConnected()) {
this.client.tell(decorateMessage(message), getSelf());
}
terminate();
}
// =========== Actor / Communication Failure / Timeouts ===============
else if (message instanceof Terminated) {
ActorRef target = ((Terminated) message).getActor();
if (jobManager.equals(target)) {
LOG.info("Lost connection to JobManager {}. Triggering connection timeout.",
jobManager.path());
disconnectFromJobManager();
if (isClientConnected()) {
if (connectionTimeoutId == null) {
// only register a connection timeout if we haven't done this before
registerConnectionTimeout();
}
}
} else {
LOG.warn("Received 'Terminated' for unknown actor " + target);
}
}
else if (message instanceof JobClientMessages.ConnectionTimeout) {
JobClientMessages.ConnectionTimeout timeoutMessage = (JobClientMessages.ConnectionTimeout) message;
if (Objects.equals(connectionTimeoutId, timeoutMessage.id())) {
// check if we haven't found a job manager yet
if (!isJobManagerConnected()) {
final JobClientActorConnectionTimeoutException errorMessage =
new JobClientActorConnectionTimeoutException("Lost connection to the JobManager.");
final Object replyMessage = decorateMessage(new Status.Failure(errorMessage));
if (isClientConnected()) {
client.tell(
replyMessage,
getSelf());
}
// Connection timeout reached, let's terminate
terminate();
}
} else {
LOG.debug("Received outdated connection timeout.");
}
}
// =========== Message Delegation ===============
else if (!isJobManagerConnected() && getClientMessageClass().equals(message.getClass())) {
LOG.info(
"Received {} but there is no connection to a JobManager yet.",
message);
// We want to submit/attach to a job, but we haven't found a job manager yet.
// Let's give him another chance to find a job manager within the given timeout.
if (connectionTimeoutId == null) {
// only register the connection timeout once
registerConnectionTimeout();
}
handleCustomMessage(message);
}
else {
if (!toBeTerminated) {
handleCustomMessage(message);
} else {
// we're about to receive a PoisonPill because toBeTerminated == true
String msg = getClass().getName() + " is about to be terminated. Therefore, the " +
"job submission cannot be executed.";
LOG.error(msg);
getSender().tell(
decorateMessage(new Status.Failure(new Exception(msg))), ActorRef.noSender());
}
}
}
@Override
protected UUID getLeaderSessionID() {
return leaderSessionID;
}
protected void logAndPrintMessage(String message) {
LOG.info(message);
if (sysoutUpdates) {
System.out.println(message);
}
}
private void logAndPrintMessage(ExecutionGraphMessages.ExecutionStateChanged message) {
LOG.info(message.toString());
if (sysoutUpdates) {
System.out.println(message.toString());
}
}
private void logAndPrintMessage(ExecutionGraphMessages.JobStatusChanged message) {
// by default, this only prints the status, and not any exception.
// in state FAILING, we report the exception in addition
if (message.newJobStatus() != JobStatus.FAILING || message.error() == null) {
LOG.info(message.toString());
if (sysoutUpdates) {
System.out.println(message.toString());
}
} else {
Throwable error = SerializedThrowable.get(message.error(), getClass().getClassLoader());
LOG.info(message.toString(), error);
if (sysoutUpdates) {
System.out.println(message.toString());
message.error().printStackTrace(System.out);
}
}
}
@Override
public void notifyLeaderAddress(String leaderAddress, UUID leaderSessionID) {
getSelf().tell(
decorateMessage(new JobManagerLeaderAddress(leaderAddress, leaderSessionID)),
getSelf());
}
@Override
public void handleError(Exception exception) {
LOG.error("Error occurred in the LeaderRetrievalService.", exception);
getSelf().tell(decorateMessage(PoisonPill.getInstance()), getSelf());
}
private void disconnectFromJobManager() {
LOG.info("Disconnect from JobManager {}.", jobManager);
if (jobManager != ActorRef.noSender()) {
getContext().unwatch(jobManager);
jobManager = ActorRef.noSender();
}
leaderSessionID = null;
}
private void connectToJobManager(ActorRef jobManager) {
LOG.info("Connect to JobManager {}.", jobManager);
if (jobManager != ActorRef.noSender()) {
getContext().unwatch(jobManager);
}
this.jobManager = jobManager;
getContext().watch(jobManager);
unregisterConnectionTimeout();
}
protected void terminate() {
LOG.info("Terminate JobClientActor.");
toBeTerminated = true;
disconnectFromJobManager();
getSelf().tell(decorateMessage(PoisonPill.getInstance()), ActorRef.noSender());
}
private boolean isJobManagerConnected() {
return jobManager != ActorRef.noSender();
}
protected boolean isClientConnected() {
return client != ActorRef.noSender();
}
private void registerConnectionTimeout() {
if (connectionTimeout != null) {
connectionTimeout.cancel();
}
connectionTimeoutId = UUID.randomUUID();
connectionTimeout = getContext().system().scheduler().scheduleOnce(
timeout,
getSelf(),
decorateMessage(new JobClientMessages.ConnectionTimeout(connectionTimeoutId)),
getContext().dispatcher(),
ActorRef.noSender()
);
}
private void unregisterConnectionTimeout() {
if (connectionTimeout != null) {
connectionTimeout.cancel();
connectionTimeout = null;
connectionTimeoutId = null;
}
}
}
