| /** |
| * 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; |
| |
| import java.lang.Thread.UncaughtExceptionHandler; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.classification.InterfaceAudience.Public; |
| import org.apache.hadoop.classification.InterfaceStability.Evolving; |
| import org.apache.hadoop.util.ExitUtil; |
| import org.apache.hadoop.util.ShutdownHookManager; |
| |
| /** |
| * This class is intended to be installed by calling |
| * {@link Thread#setDefaultUncaughtExceptionHandler(UncaughtExceptionHandler)} |
| * In the main entry point. It is intended to try and cleanly shut down |
| * programs using the YARN Event framework. |
| * |
| * Note: Right now it only will shut down the program if a Error is caught, but |
| * not any other exception. Anything else is just logged. |
| */ |
| @Public |
| @Evolving |
| public class YarnUncaughtExceptionHandler implements UncaughtExceptionHandler { |
| private static final Log LOG = LogFactory.getLog(YarnUncaughtExceptionHandler.class); |
| |
| @Override |
| public void uncaughtException(Thread t, Throwable e) { |
| if(ShutdownHookManager.get().isShutdownInProgress()) { |
| LOG.error("Thread " + t + " threw an Throwable, but we are shutting " + |
| "down, so ignoring this", e); |
| } else if(e instanceof Error) { |
| try { |
| LOG.fatal("Thread " + t + " threw an Error. Shutting down now...", e); |
| } catch (Throwable err) { |
| //We don't want to not exit because of an issue with logging |
| } |
| if(e instanceof OutOfMemoryError) { |
| //After catching an OOM java says it is undefined behavior, so don't |
| //even try to clean up or we can get stuck on shutdown. |
| try { |
| System.err.println("Halting due to Out Of Memory Error..."); |
| } catch (Throwable err) { |
| //Again we done want to exit because of logging issues. |
| } |
| ExitUtil.halt(-1); |
| } else { |
| ExitUtil.terminate(-1); |
| } |
| } else { |
| LOG.error("Thread " + t + " threw an Exception.", e); |
| } |
| } |
| } |