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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.util;
import akka.actor.ActorRef;
import akka.actor.ActorSystem;
import akka.dispatch.Mapper;
import akka.dispatch.OnComplete;
import org.apache.flink.api.common.time.Time;
import org.apache.flink.configuration.ConfigConstants;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.configuration.IllegalConfigurationException;
import org.apache.flink.runtime.akka.AkkaUtils;
import org.apache.flink.runtime.instance.ActorGateway;
import org.apache.flink.runtime.instance.AkkaActorGateway;
import org.apache.flink.runtime.jobmanager.HighAvailabilityMode;
import org.apache.flink.runtime.leaderretrieval.LeaderRetrievalException;
import org.apache.flink.runtime.leaderretrieval.LeaderRetrievalListener;
import org.apache.flink.runtime.leaderretrieval.LeaderRetrievalService;
import org.apache.flink.runtime.net.ConnectionUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import scala.concurrent.Await;
import scala.concurrent.Future;
import scala.concurrent.Promise;
import scala.concurrent.duration.FiniteDuration;
import java.net.InetAddress;
import java.util.UUID;
/**
* Utility class to work with {@link LeaderRetrievalService} class.
*/
public class LeaderRetrievalUtils {
private static final Logger LOG = LoggerFactory.getLogger(LeaderRetrievalUtils.class);
/**
* Retrieves the current leader gateway using the given {@link LeaderRetrievalService}. If the
* current leader could not be retrieved after the given timeout, then a
* {@link LeaderRetrievalException} is thrown.
*
* @param leaderRetrievalService {@link LeaderRetrievalService} which is used for the leader retrieval
* @param actorSystem ActorSystem which is used for the {@link LeaderRetrievalListener} implementation
* @param timeout Timeout value for the retrieval call
* @return The current leader gateway
* @throws LeaderRetrievalException If the actor gateway could not be retrieved or the timeout has been exceeded
*/
public static ActorGateway retrieveLeaderGateway(
LeaderRetrievalService leaderRetrievalService,
ActorSystem actorSystem,
FiniteDuration timeout)
throws LeaderRetrievalException {
LeaderGatewayListener listener = new LeaderGatewayListener(actorSystem, timeout);
try {
leaderRetrievalService.start(listener);
Future actorGatewayFuture = listener.getActorGatewayFuture();
return Await.result(actorGatewayFuture, timeout);
} catch (Exception e) {
throw new LeaderRetrievalException("Could not retrieve the leader gateway.", e);
} finally {
try {
leaderRetrievalService.stop();
} catch (Exception fe) {
LOG.warn("Could not stop the leader retrieval service.", fe);
}
}
}
/**
* Retrieves the leader akka url and the current leader session ID. The values are stored in a
* {@link LeaderConnectionInfo} instance.
*
* @param leaderRetrievalService Leader retrieval service to retrieve the leader connection
* information
* @param timeout Timeout when to give up looking for the leader
* @return LeaderConnectionInfo containing the leader's akka URL and the current leader session
* ID
* @throws LeaderRetrievalException
*/
public static LeaderConnectionInfo retrieveLeaderConnectionInfo(
LeaderRetrievalService leaderRetrievalService,
FiniteDuration timeout
) throws LeaderRetrievalException {
LeaderConnectionInfoListener listener = new LeaderConnectionInfoListener();
try {
leaderRetrievalService.start(listener);
Future connectionInfoFuture = listener.getLeaderConnectionInfoFuture();
return Await.result(connectionInfoFuture, timeout);
} catch (Exception e) {
throw new LeaderRetrievalException("Could not retrieve the leader address and leader " +
"session ID.", e);
} finally {
try {
leaderRetrievalService.stop();
} catch (Exception fe) {
LOG.warn("Could not stop the leader retrieval service.", fe);
}
}
}
/**
* Retrieves the current leader session id of the component identified by the given leader
* retrieval service.
*
* @param leaderRetrievalService Leader retrieval service to be used for the leader retrieval
* @param timeout Timeout for the leader retrieval
* @return The leader session id of the retrieved leader
* @throws LeaderRetrievalException if the leader retrieval operation fails (including a timeout)
*/
public static UUID retrieveLeaderSessionId(
LeaderRetrievalService leaderRetrievalService,
FiniteDuration timeout) throws LeaderRetrievalException {
return retrieveLeaderConnectionInfo(leaderRetrievalService, timeout).getLeaderSessionID();
}
public static InetAddress findConnectingAddress(
LeaderRetrievalService leaderRetrievalService,
Time timeout) throws LeaderRetrievalException {
return findConnectingAddress(leaderRetrievalService, new FiniteDuration(timeout.getSize(), timeout.getUnit()));
}
public static InetAddress findConnectingAddress(
LeaderRetrievalService leaderRetrievalService,
FiniteDuration timeout) throws LeaderRetrievalException {
ConnectionUtils.LeaderConnectingAddressListener listener = new ConnectionUtils.LeaderConnectingAddressListener();
try {
leaderRetrievalService.start(listener);
LOG.info("Trying to select the network interface and address to use " +
"by connecting to the leading JobManager.");
LOG.info("TaskManager will try to connect for " + timeout +
" before falling back to heuristics");
return listener.findConnectingAddress(timeout);
} catch (Exception e) {
throw new LeaderRetrievalException("Could not find the connecting address by " +
"connecting to the current leader.", e);
} finally {
try {
leaderRetrievalService.stop();
} catch (Exception fe) {
LOG.warn("Could not stop the leader retrieval service.", fe);
}
}
}
/**
* Helper class which is used by the retrieveLeaderGateway method as the
* {@link LeaderRetrievalListener}.
*/
public static class LeaderGatewayListener implements LeaderRetrievalListener {
private final ActorSystem actorSystem;
private final FiniteDuration timeout;
private final Object lock = new Object();
private final Promise futureActorGateway = new scala.concurrent.impl.Promise.DefaultPromise();
public LeaderGatewayListener(ActorSystem actorSystem, FiniteDuration timeout) {
this.actorSystem = actorSystem;
this.timeout = timeout;
}
private void completePromise(ActorGateway gateway) {
synchronized (lock) {
if (!futureActorGateway.isCompleted()) {
futureActorGateway.success(gateway);
}
}
}
@Override
public void notifyLeaderAddress(final String leaderAddress, final UUID leaderSessionID) {
if(leaderAddress != null && !leaderAddress.equals("") && !futureActorGateway.isCompleted()) {
AkkaUtils.getActorRefFuture(leaderAddress, actorSystem, timeout)
.map(new Mapper() {
public ActorGateway apply(ActorRef ref) {
return new AkkaActorGateway(ref, leaderSessionID);
}
}, actorSystem.dispatcher())
.onComplete(new OnComplete() {
@Override
public void onComplete(Throwable failure, ActorGateway success) throws Throwable {
if (failure == null) {
completePromise(success);
} else {
LOG.debug("Could not retrieve the leader for address " + leaderAddress + ".", failure);
}
}
}, actorSystem.dispatcher());
}
}
@Override
public void handleError(Exception exception) {
if (!futureActorGateway.isCompleted()) {
futureActorGateway.failure(exception);
}
}
public Future getActorGatewayFuture() {
return futureActorGateway.future();
}
}
/**
* Helper class which is used by the retrieveLeaderConnectionInfo method to retrieve the
* leader's akka URL and the current leader session ID.
*/
public static class LeaderConnectionInfoListener implements LeaderRetrievalListener {
private final Promise connectionInfo = new scala.concurrent.impl.Promise.DefaultPromise<>();
public Future getLeaderConnectionInfoFuture() {
return connectionInfo.future();
}
@Override
public void notifyLeaderAddress(String leaderAddress, UUID leaderSessionID) {
if(leaderAddress != null && !leaderAddress.equals("") && !connectionInfo.isCompleted()) {
connectionInfo.success(new LeaderConnectionInfo(leaderAddress, leaderSessionID));
}
}
@Override
public void handleError(Exception exception) {
if (!connectionInfo.isCompleted()) {
connectionInfo.failure(exception);
}
}
}
/**
* Gets the recovery mode as configured, based on the {@link ConfigConstants#HA_MODE}
* config key.
*
* @param config The configuration to read the recovery mode from.
* @return The recovery mode.
*
* @throws IllegalConfigurationException Thrown, if the recovery mode does not correspond
* to a known value.
*/
public static HighAvailabilityMode getRecoveryMode(Configuration config) {
return HighAvailabilityMode.fromConfig(config);
}
// ------------------------------------------------------------------------
/**
* Private constructor to prevent instantiation.
*/
private LeaderRetrievalUtils() {
throw new RuntimeException();
}
}
