org.apache.flink.runtime.util.ProcessShutDownThread Maven / Gradle / Ivy
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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.ActorSystem;
import org.slf4j.Logger;
import scala.concurrent.duration.Duration;
import java.util.concurrent.TimeoutException;
import static org.apache.flink.util.Preconditions.checkNotNull;
/**
* JVM shut down thread awaiting actor system shut down for a certain amount
* of time before exiting the JVM.
*
* On some Linux distributions, YARN is not able to stop containers, because
* the kill command has different arguments. For example when
* running Flink on GCE ("Debian GNU/Linux 7.9 (wheezy)"), YARN containers will
* not properly shut down when we don't call System.exit().
*/
public class ProcessShutDownThread extends Thread {
/** Log of the corresponding YARN process. */
private final Logger log;
/** Actor system to await termination of. */
private final ActorSystem actorSystem;
/** Actor system termination timeout before shutting down the JVM. */
private final Duration terminationTimeout;
/**
* Creates a shut down thread.
*
* @param log Log of the corresponding YARN process.
* @param actorSystem Actor system to await termination of.
* @param terminationTimeout Actor system termination timeout before
* shutting down the JVM.
*/
public ProcessShutDownThread(
Logger log,
ActorSystem actorSystem,
Duration terminationTimeout) {
this.log = checkNotNull(log, "Logger");
this.actorSystem = checkNotNull(actorSystem, "Actor system");
this.terminationTimeout = checkNotNull(terminationTimeout, "Termination timeout");
}
@Override
public void run() {
try {
actorSystem.awaitTermination(terminationTimeout);
} catch (Exception e) {
if (e instanceof TimeoutException) {
log.error("Actor system shut down timed out.", e);
} else {
log.error("Failure during actor system shut down.", e);
}
} finally {
log.info("Shutdown completed. Stopping JVM.");
System.exit(0);
}
}
}