hadoop LocatedStripedBlock 源码

  • 2022-10-20
  • 浏览 (18)

haddop LocatedStripedBlock 代码

文件路径:/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/protocol/LocatedStripedBlock.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.protocol;

import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.fs.StorageType;
import org.apache.hadoop.hdfs.security.token.block.BlockTokenIdentifier;
import org.apache.hadoop.security.token.Token;

import java.util.Arrays;

/**
 * {@link LocatedBlock} with striped block support. For a striped block, each
 * datanode storage is associated with a block in the block group. We need to
 * record the index (in the striped block group) for each of them.
 */
@InterfaceAudience.Private
@InterfaceStability.Evolving
public class LocatedStripedBlock extends LocatedBlock {
  private static final byte[] EMPTY_INDICES = {};
  private static final Token<BlockTokenIdentifier> EMPTY_TOKEN = new Token<>();

  private final byte[] blockIndices;
  private Token<BlockTokenIdentifier>[] blockTokens;

  @SuppressWarnings({"unchecked"})
  public LocatedStripedBlock(ExtendedBlock b, DatanodeInfo[] locs,
      String[] storageIDs, StorageType[] storageTypes, byte[] indices,
      long startOffset, boolean corrupt, DatanodeInfo[] cachedLocs) {
    super(b, locs, storageIDs, storageTypes, startOffset, corrupt, cachedLocs);

    if (indices == null) {
      this.blockIndices = EMPTY_INDICES;
    } else {
      this.blockIndices = new byte[indices.length];
      System.arraycopy(indices, 0, blockIndices, 0, indices.length);
    }
    blockTokens = new Token[blockIndices.length];
    for (int i = 0; i < blockIndices.length; i++) {
      blockTokens[i] = EMPTY_TOKEN;
    }
  }

  @Override
  public String toString() {
    return getClass().getSimpleName() + "{" + getBlock()
        + "; getBlockSize()=" + getBlockSize()
        + "; corrupt=" + isCorrupt()
        + "; offset=" + getStartOffset()
        + "; locs=" + Arrays.asList(getLocations())
        + "; indices=" + Arrays.toString(blockIndices)
        + "}";
  }

  public byte[] getBlockIndices() {
    return this.blockIndices;
  }

  @Override
  public boolean isStriped() {
    return true;
  }

  @Override
  public BlockType getBlockType() {
    return BlockType.STRIPED;
  }

  public Token<BlockTokenIdentifier>[] getBlockTokens() {
    return blockTokens;
  }

  public void setBlockTokens(Token<BlockTokenIdentifier>[] tokens) {
    this.blockTokens = tokens;
  }
}

相关信息

hadoop 源码目录

相关文章

hadoop AclException 源码

hadoop AddErasureCodingPolicyResponse 源码

hadoop AlreadyBeingCreatedException 源码

hadoop BatchedDirectoryListing 源码

hadoop Block 源码

hadoop BlockChecksumOptions 源码

hadoop BlockChecksumType 源码

hadoop BlockLocalPathInfo 源码

hadoop BlockStoragePolicy 源码

hadoop BlockType 源码

0  赞