hadoop YarnUncaughtExceptionHandler 源码
haddop YarnUncaughtExceptionHandler 代码
文件路径：/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/YarnUncaughtExceptionHandler.java
/**
* 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.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.slf4j.Marker;
import org.slf4j.MarkerFactory;
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 Logger LOG =
LoggerFactory.getLogger(YarnUncaughtExceptionHandler.class);
private static final Marker FATAL =
MarkerFactory.getMarker("FATAL");
@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.error(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);
}
}
}
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