hadoop AMCommand 源码
haddop AMCommand 代码
文件路径：/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/api/records/AMCommand.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.api.records;
import org.apache.hadoop.classification.InterfaceAudience.Public;
import org.apache.hadoop.classification.InterfaceStability.Unstable;
import org.apache.hadoop.yarn.api.ApplicationMasterProtocol;
import org.apache.hadoop.yarn.api.protocolrecords.AllocateResponse;
import org.apache.hadoop.yarn.api.protocolrecords.RegisterApplicationMasterRequest;
import org.apache.hadoop.yarn.exceptions.ApplicationAttemptNotFoundException;
import org.apache.hadoop.yarn.exceptions.ApplicationMasterNotRegisteredException;
/**
* Command sent by the Resource Manager to the Application Master in the
* AllocateResponse
* @see AllocateResponse
*/
@Public
@Unstable
public enum AMCommand {
/**
* @deprecated Sent by Resource Manager when it is out of sync with the AM and
* wants the AM get back in sync.
*
* Note: Instead of sending this command,
* {@link ApplicationMasterNotRegisteredException} will be thrown
* when ApplicationMaster is out of sync with ResourceManager and
* ApplicationMaster is expected to re-register with RM by calling
* {@link ApplicationMasterProtocol#registerApplicationMaster(RegisterApplicationMasterRequest)}
*/
AM_RESYNC,
/**
* @deprecated Sent by Resource Manager when it wants the AM to shutdown.
* Note: This command was earlier sent by ResourceManager to
* instruct AM to shutdown if RM had restarted. Now
* {@link ApplicationAttemptNotFoundException} will be thrown in case
* that RM has restarted and AM is supposed to handle this
* exception by shutting down itself.
*/
AM_SHUTDOWN
}
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