hadoop HealthReporter 源码
haddop HealthReporter 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/HealthReporter.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;
/**
* Interface providing information about the health of a service.
*
* Associated pieces of information:
* <ul>
* <li>whether the service is healthy ({@link #isHealthy()})</li>
* <li>report of the healthiness ({@link #getHealthReport()})</li>
* <li>latest timestamp of the health check
* ({@link #getLastHealthReportTime()})</li>
* </ul>
*
* Classes implementing this interface are used in
* {@link NodeHealthCheckerService}.
*
* Developers are discouraged to implement new Java-based health scripts,
* they should rather try to implement it as a script and use the
* {@link NodeHealthScriptRunner} implementation.
*
* @see TimedHealthReporterService
* @see org.apache.hadoop.yarn.server.nodemanager.LocalDirsHandlerService
*/
public interface HealthReporter {
/**
* Gets whether the node is healthy or not.
*
* @return true if node is healthy
*/
boolean isHealthy();
/**
* Returns output from health check. If node is healthy then an empty string
* is returned.
*
* @return output from health check
*/
String getHealthReport();
/**
* Returns time stamp when node health check was last run.
*
* @return timestamp when node health script was last run
*/
long getLastHealthReportTime();
}
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