hadoop FileUnderConstructionFeature 源码

haddop FileUnderConstructionFeature 代码

文件路径：/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FileUnderConstructionFeature.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.namenode;

import java.io.IOException;

import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.hdfs.server.blockmanagement.BlockInfo;
import org.apache.hadoop.hdfs.server.namenode.INode.BlocksMapUpdateInfo;

/**
 * Feature for under-construction file.
 */
@InterfaceAudience.Private
public class FileUnderConstructionFeature implements INode.Feature {
  private String clientName; // lease holder
  private final String clientMachine;

  public FileUnderConstructionFeature(final String clientName, final String clientMachine) {
    this.clientName = clientName;
    this.clientMachine = clientMachine;
  }

  public String getClientName() {
    return clientName;
  }

  void setClientName(String clientName) {
    this.clientName = clientName;
  }

  public String getClientMachine() {
    return clientMachine;
  }

  /**
   * Update the length for the last block
   *
   * @param lastBlockLength
   *          The length of the last block reported from client
   * @throws IOException
   */
  void updateLengthOfLastBlock(INodeFile f, long lastBlockLength)
      throws IOException {
    BlockInfo lastBlock = f.getLastBlock();
    assert (lastBlock != null) : "The last block for path "
        + f.getFullPathName() + " is null when updating its length";
    assert !lastBlock.isComplete()
        : "The last block for path " + f.getFullPathName()
            + " is not under-construction when updating its length";
    lastBlock.setNumBytes(lastBlockLength);
  }

  /**
   * When deleting a file in the current fs directory, and the file is contained
   * in a snapshot, we should delete the last block if it's under construction
   * and its size is 0.
   */
  void cleanZeroSizeBlock(final INodeFile f,
      final BlocksMapUpdateInfo collectedBlocks) {
    final BlockInfo[] blocks = f.getBlocks();
    if (blocks != null && blocks.length > 0
        && !blocks[blocks.length - 1].isComplete()) {
      BlockInfo lastUC = blocks[blocks.length - 1];
      if (lastUC.getNumBytes() == 0) {
        // this is a 0-sized block. do not need check its UC state here
        collectedBlocks.addDeleteBlock(lastUC);
        f.removeLastBlock(lastUC);
      }
    }
  }
}

相关信息

hadoop 源码目录

相关文章

hadoop AclEntryStatusFormat 源码

hadoop AclFeature 源码

hadoop AclStorage 源码

hadoop AclTransformation 源码

hadoop AuditLogger 源码

hadoop BackupImage 源码

hadoop BackupJournalManager 源码

hadoop BackupNode 源码

hadoop BackupState 源码

hadoop CacheManager 源码