hadoop RegisterCommand 源码
haddop RegisterCommand 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/protocol/RegisterCommand.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.hdfs.server.protocol;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
/**
* A RegisterCommand is an instruction to a datanode to register with the namenode.
* This command can't be combined with other commands in the same response.
* This is because after the datanode processes RegisterCommand, it will skip
* the rest of the DatanodeCommands in the same HeartbeatResponse.
*/
@InterfaceAudience.Private
@InterfaceStability.Evolving
public class RegisterCommand extends DatanodeCommand {
public static final DatanodeCommand REGISTER = new RegisterCommand();
public RegisterCommand() {
super(DatanodeProtocol.DNA_REGISTER);
}
}
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