hadoop ExceptionReporter 源码
haddop ExceptionReporter 代码
文件路径：/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/health/ExceptionReporter.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.nodemanager.health;
/**
* Simple {@link HealthReporter} implementation which reports whether a fatal
* exception has happened in the NodeManager.
*
* See the <code>reportException</code> call of
* {@link org.apache.hadoop.yarn.server.nodemanager.NodeStatusUpdaterImpl}
*/
public class ExceptionReporter implements HealthReporter {
private Exception nodeHealthException;
private long nodeHealthExceptionReportTime;
ExceptionReporter() {
this.nodeHealthException = null;
this.nodeHealthExceptionReportTime = 0;
}
@Override
public synchronized boolean isHealthy() {
return nodeHealthException == null;
}
@Override
public synchronized String getHealthReport() {
return nodeHealthException == null ? null :
nodeHealthException.getMessage();
}
@Override
public synchronized long getLastHealthReportTime() {
return nodeHealthExceptionReportTime;
}
/**
* Report an exception to mark the node as unhealthy.
* @param ex the exception that makes the node unhealthy
*/
public synchronized void reportException(Exception ex) {
nodeHealthException = ex;
nodeHealthExceptionReportTime = System.currentTimeMillis();
}
}
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