| /** |
| * 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.hadoop.yarn.server.resourcemanager; |
| |
| import java.lang.Thread.UncaughtExceptionHandler; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| import org.apache.hadoop.classification.InterfaceAudience.Private; |
| import org.apache.hadoop.yarn.exceptions.YarnException; |
| |
| /** |
| * This class either shuts down {@link ResourceManager} or transitions the |
| * {@link ResourceManager} to standby state if a critical thread throws an |
| * uncaught exception. It is intended to be installed by calling |
| * {@code setUncaughtExceptionHandler(Thread.UncaughtExceptionHandler)} |
| * in the thread entry point or after creation of threads. |
| */ |
| @Private |
| public class RMCriticalThreadUncaughtExceptionHandler |
| implements UncaughtExceptionHandler { |
| private static final Logger LOG = LoggerFactory.getLogger( |
| RMCriticalThreadUncaughtExceptionHandler.class); |
| private final RMContext rmContext; |
| |
| public RMCriticalThreadUncaughtExceptionHandler(RMContext rmContext) { |
| this.rmContext = rmContext; |
| } |
| |
| @Override |
| public void uncaughtException(Thread t, Throwable e) { |
| Exception ex; |
| |
| if (e instanceof Exception) { |
| ex = (Exception)e; |
| } else { |
| ex = new YarnException(e); |
| } |
| |
| RMFatalEvent event = |
| new RMFatalEvent(RMFatalEventType.CRITICAL_THREAD_CRASH, ex, |
| String.format("a critical thread, %s, that exited unexpectedly", |
| t.getName())); |
| |
| rmContext.getDispatcher().getEventHandler().handle(event); |
| } |
| } |