hadoop ContainerStateTransitionListener 源码
haddop ContainerStateTransitionListener 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/ContainerStateTransitionListener.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
* <p>
* http://www.apache.org/licenses/LICENSE-2.0
* <p>
* 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;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.yarn.server.nodemanager.containermanager.container.ContainerEvent;
import org.apache.hadoop.yarn.server.nodemanager.containermanager.container.ContainerImpl;
import org.apache.hadoop.yarn.server.nodemanager.containermanager.container.ContainerState;
import org.apache.hadoop.yarn.state.StateTransitionListener;
/**
* Interface to be used by external cluster operators to implement a
* State Transition listener that is notified before and after a container
* state transition.
* NOTE: The pre and post transition callbacks will be made in the synchronized
* block as the call to the instrumented transition - Serially, in the
* order: preTransition, transition and postTransition. The implementor
* must ensure that the callbacks return in a timely manner to avoid
* blocking the state-machine.
*/
@InterfaceAudience.Public
@InterfaceStability.Evolving
public interface ContainerStateTransitionListener extends
StateTransitionListener<ContainerImpl, ContainerEvent, ContainerState> {
/**
* Init method which will be invoked by the Node Manager to inject the
* NM {@link Context}.
* @param context NM Context.
*/
void init(Context context);
}
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