hadoop BlockPlacementPolicyAlwaysSatisfied 源码
haddop BlockPlacementPolicyAlwaysSatisfied 代码
文件路径：/hadoop-tools/hadoop-dynamometer/hadoop-dynamometer-infra/src/main/java/org/apache/hadoop/tools/dynamometer/BlockPlacementPolicyAlwaysSatisfied.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.tools.dynamometer;
import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
import org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicyDefault;
import org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementStatus;
/**
* A BlockPlacementPolicy which always considered itself satisfied. This avoids
* the issue that the Dynamometer NameNode will complain about blocks being
* under-replicated because they're not being put on distinct racks.
*/
public class BlockPlacementPolicyAlwaysSatisfied
extends BlockPlacementPolicyDefault {
private static final BlockPlacementStatusSatisfied SATISFIED =
new BlockPlacementStatusSatisfied();
private static class BlockPlacementStatusSatisfied
implements BlockPlacementStatus {
@Override
public boolean isPlacementPolicySatisfied() {
return true;
}
public String getErrorDescription() {
return null;
}
@Override
public int getAdditionalReplicasRequired() {
return 0;
}
}
@Override
public BlockPlacementStatus verifyBlockPlacement(DatanodeInfo[] locs,
int numberOfReplicas) {
return SATISFIED;
}
}
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