hadoop BlockPlacementPolicies 源码
haddop BlockPlacementPolicies 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockPlacementPolicies.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;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hdfs.DFSConfigKeys;
import org.apache.hadoop.hdfs.protocol.BlockType;
import org.apache.hadoop.net.NetworkTopology;
import org.apache.hadoop.util.ReflectionUtils;
@InterfaceAudience.Private
public class BlockPlacementPolicies{
private final BlockPlacementPolicy replicationPolicy;
private final BlockPlacementPolicy ecPolicy;
public BlockPlacementPolicies(Configuration conf, FSClusterStats stats,
NetworkTopology clusterMap,
Host2NodesMap host2datanodeMap){
final Class<? extends BlockPlacementPolicy> replicatorClass = conf
.getClass(DFSConfigKeys.DFS_BLOCK_REPLICATOR_CLASSNAME_KEY,
DFSConfigKeys.DFS_BLOCK_REPLICATOR_CLASSNAME_DEFAULT,
BlockPlacementPolicy.class);
replicationPolicy = ReflectionUtils.newInstance(replicatorClass, conf);
replicationPolicy.initialize(conf, stats, clusterMap, host2datanodeMap);
final Class<? extends BlockPlacementPolicy> blockPlacementECClass =
conf.getClass(DFSConfigKeys.DFS_BLOCK_PLACEMENT_EC_CLASSNAME_KEY,
DFSConfigKeys.DFS_BLOCK_PLACEMENT_EC_CLASSNAME_DEFAULT,
BlockPlacementPolicy.class);
ecPolicy = ReflectionUtils.newInstance(blockPlacementECClass, conf);
ecPolicy.initialize(conf, stats, clusterMap, host2datanodeMap);
}
public BlockPlacementPolicy getPolicy(BlockType blockType){
switch (blockType) {
case CONTIGUOUS: return replicationPolicy;
case STRIPED: return ecPolicy;
default:
throw new IllegalArgumentException(
"getPolicy received a BlockType that isn't supported.");
}
}
}
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