hadoop FileRegion 源码
haddop FileRegion 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/common/FileRegion.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.common;
import org.apache.commons.lang3.tuple.Pair;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hdfs.protocol.Block;
import org.apache.hadoop.hdfs.protocol.HdfsConstants;
import org.apache.hadoop.hdfs.protocol.ProvidedStorageLocation;
/**
* This class is used to represent provided blocks that are file regions,
* i.e., can be described using (path, offset, length).
*/
@InterfaceAudience.Public
@InterfaceStability.Unstable
public class FileRegion implements BlockAlias {
private final Pair<Block, ProvidedStorageLocation> pair;
public FileRegion(long blockId, Path path, long offset,
long length, long genStamp) {
this(blockId, path, offset, length, genStamp, new byte[0]);
}
public FileRegion(long blockId, Path path, long offset,
long length, long genStamp, byte[] nonce) {
this(new Block(blockId, length, genStamp),
new ProvidedStorageLocation(path, offset, length, nonce));
}
public FileRegion(long blockId, Path path, long offset, long length) {
this(blockId, path, offset, length,
HdfsConstants.GRANDFATHER_GENERATION_STAMP);
}
public FileRegion(Block block,
ProvidedStorageLocation providedStorageLocation) {
this.pair = Pair.of(block, providedStorageLocation);
}
public Block getBlock() {
return pair.getKey();
}
public ProvidedStorageLocation getProvidedStorageLocation() {
return pair.getValue();
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
FileRegion that = (FileRegion) o;
return pair.equals(that.pair);
}
@Override
public int hashCode() {
return pair.hashCode();
}
}
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