hadoop BlockPlacementStatusDefault 源码
haddop BlockPlacementStatusDefault 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockPlacementStatusDefault.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.blockmanagement;
public class BlockPlacementStatusDefault implements BlockPlacementStatus {
private int requiredRacks = 0;
private int currentRacks = 0;
private final int totalRacks;
public BlockPlacementStatusDefault(int currentRacks, int requiredRacks,
int totalRacks){
this.requiredRacks = requiredRacks;
this.currentRacks = currentRacks;
this.totalRacks = totalRacks;
}
@Override
public boolean isPlacementPolicySatisfied() {
return requiredRacks <= currentRacks || currentRacks >= totalRacks;
}
@Override
public String getErrorDescription() {
if (isPlacementPolicySatisfied()) {
return null;
}
return "Block should be additionally replicated on " +
(requiredRacks - currentRacks) +
" more rack(s). Total number of racks in the cluster: " + totalRacks;
}
@Override
public int getAdditionalReplicasRequired() {
if (isPlacementPolicySatisfied()) {
return 0;
} else {
return requiredRacks - currentRacks;
}
}
}
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