hadoop BalancerBandwidthCommand 源码
haddop BalancerBandwidthCommand 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/protocol/BalancerBandwidthCommand.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;
/*
* A system administrator can tune the balancer bandwidth parameter
* (dfs.datanode.balance.bandwidthPerSec) dynamically by calling
* "dfsadmin -setBalanacerBandwidth newbandwidth".
* This class is to define the command which sends the new bandwidth value to
* each datanode.
*/
/**
* Balancer bandwidth command instructs each datanode to change its value for
* the max amount of network bandwidth it may use during the block balancing
* operation.
*
* The Balancer Bandwidth Command contains the new bandwidth value as its
* payload. The bandwidth value is in bytes per second.
*/
public class BalancerBandwidthCommand extends DatanodeCommand {
private final static long BBC_DEFAULTBANDWIDTH = 0L;
private final long bandwidth;
/**
* Balancer Bandwidth Command constructor. Sets bandwidth to 0.
*/
BalancerBandwidthCommand() {
this(BBC_DEFAULTBANDWIDTH);
}
/**
* Balancer Bandwidth Command constructor.
*
* @param bandwidth Blanacer bandwidth in bytes per second.
*/
public BalancerBandwidthCommand(long bandwidth) {
super(DatanodeProtocol.DNA_BALANCERBANDWIDTHUPDATE);
this.bandwidth = bandwidth;
}
/**
* Get current value of the max balancer bandwidth in bytes per second.
*
* @return bandwidth Blanacer bandwidth in bytes per second for this datanode.
*/
public long getBalancerBandwidthValue() {
return this.bandwidth;
}
}
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