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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,
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 * See the License for the specific language governing permissions and
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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); } } }





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