hadoop LocatedStripedBlock 源码

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;
  }
}

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