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();
  }
}

相关信息

hadoop 源码目录

相关文章

hadoop AutoCloseDataSetLock 源码

hadoop BlockAlias 源码

hadoop DataNodeLockManager 源码

hadoop ECTopologyVerifier 源码

hadoop GenerationStamp 源码

hadoop HdfsServerConstants 源码

hadoop HostRestrictingAuthorizationFilter 源码

hadoop HttpGetFailedException 源码

hadoop HttpPutFailedException 源码

hadoop InconsistentFSStateException 源码