hadoop RMCriticalThreadUncaughtExceptionHandler 源码
haddop RMCriticalThreadUncaughtExceptionHandler 代码
文件路径：/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/RMCriticalThreadUncaughtExceptionHandler.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.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);
}
}
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