hadoop Step 源码
haddop Step 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/diskbalancer/planner/Step.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.hdfs.server.diskbalancer.planner;
import org.apache.hadoop.hdfs.server.diskbalancer.datamodel.DiskBalancerVolume;
/**
* A step in the plan.
*/
public interface Step {
/**
* Return the number of bytes to move.
*
* @return bytes
*/
long getBytesToMove();
/**
* Gets the destination volume.
*
* @return - volume
*/
DiskBalancerVolume getDestinationVolume();
/**
* Gets the IdealStorage.
*
* @return idealStorage
*/
double getIdealStorage();
/**
* Gets Source Volume.
*
* @return -- Source Volume
*/
DiskBalancerVolume getSourceVolume();
/**
* Gets a volume Set ID.
*
* @return String
*/
String getVolumeSetID();
/**
* Returns a String representation of the Step Size.
*
* @return String
*/
String getSizeString(long size);
/**
* Returns maximum number of disk erros tolerated.
* @return long.
*/
long getMaxDiskErrors();
/**
* Returns tolerance percentage, the good enough value
* when we move data from one to disk to another.
* @return long.
*/
long getTolerancePercent();
/**
* Returns max disk bandwidth that disk balancer will use.
* Expressed in MB/sec. For example, a value like 10
* indicates that disk balancer will only move 10 MB / sec
* while it is running.
* @return long.
*/
long getBandwidth();
/**
* Sets Tolerance percent on a specific step.
* @param tolerancePercent - tolerance in percentage.
*/
void setTolerancePercent(long tolerancePercent);
/**
* Set Bandwidth on a specific step.
* @param bandwidth - in MB/s
*/
void setBandwidth(long bandwidth);
/**
* Set maximum errors to tolerate before disk balancer step fails.
* @param maxDiskErrors - error count.
*/
void setMaxDiskErrors(long maxDiskErrors);
}
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