hadoop ReplicaInPipeline 源码

haddop ReplicaInPipeline 代码

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

import java.io.IOException;
import java.io.OutputStream;
import java.util.concurrent.TimeUnit;

import org.apache.hadoop.hdfs.server.datanode.fsdataset.ReplicaOutputStreams;
import org.apache.hadoop.util.DataChecksum;

/** 
 * This defines the interface of a replica in Pipeline that's being written to
 */
public interface ReplicaInPipeline extends Replica {
  /**
   * Set the number of bytes received
   * @param bytesReceived number of bytes received
   */
  void setNumBytes(long bytesReceived);

  /**
   * Get the number of bytes acked
   * @return the number of bytes acked
   */
  long getBytesAcked();

  /**
   * Set the number bytes that have acked
   * @param bytesAcked number bytes acked
   */
  void setBytesAcked(long bytesAcked);

  /**
   * Release any disk space reserved for this replica.
   */
  public void releaseAllBytesReserved();

  /**
   * Release the reserved space from the ReplicaInfo.
   */
  void releaseReplicaInfoBytesReserved();

  /**
   * store the checksum for the last chunk along with the data length
   * @param dataLength number of bytes on disk
   * @param lastChecksum - checksum bytes for the last chunk
   */
  public void setLastChecksumAndDataLen(long dataLength, byte[] lastChecksum);
  
  /**
   * gets the last chunk checksum and the length of the block corresponding
   * to that checksum
   */
  public ChunkChecksum getLastChecksumAndDataLen();
  
  /**
   * Create output streams for writing to this replica,
   * one for block file and one for CRC file
   *
   * @param isCreate if it is for creation
   * @param requestedChecksum the checksum the writer would prefer to use
   * @return output streams for writing
   * @throws IOException if any error occurs
   */
  public ReplicaOutputStreams createStreams(boolean isCreate,
      DataChecksum requestedChecksum) throws IOException;

  /**
   * Create an output stream to write restart metadata in case of datanode
   * shutting down for quick restart.
   *
   * @return output stream for writing.
   * @throws IOException if any error occurs
   */
  public OutputStream createRestartMetaStream() throws IOException;
  
  ReplicaInfo getReplicaInfo();
  
  /**
   * Set the thread that is writing to this replica
   * @param writer a thread writing to this replica
   */
  void setWriter(Thread writer);
  
  void interruptThread();
  
  /**
   * Attempt to set the writer to a new value.
   */
  boolean attemptToSetWriter(Thread prevWriter, Thread newWriter);

  /**
   * Interrupt the writing thread and wait until it dies.
   * @throws IOException the waiting is interrupted
   */
  void stopWriter(long xceiverStopTimeout) throws IOException;

  /**
   * Causes the current thread to wait until a minimum length is reached, the
   * thread is interrupted, or the specified waiting time elapses.
   *
   * @param minLength The minimum length to achieve
   * @param time the maximum time to wait
   * @param unit the time unit of the time argument
   * @throws IOException if the current thread is interrupted or the minimum
   *           length is not achieved within the time allowed.
   */
  void waitForMinLength(long minLength, long time, TimeUnit unit)
      throws IOException;
}

相关信息

hadoop 源码目录

相关文章

hadoop BPOfferService 源码

hadoop BPServiceActor 源码

hadoop BPServiceActorAction 源码

hadoop BPServiceActorActionException 源码

hadoop BlockChecksumHelper 源码

hadoop BlockPoolManager 源码

hadoop BlockPoolSliceStorage 源码

hadoop BlockReceiver 源码

hadoop BlockRecoveryWorker 源码

hadoop BlockScanner 源码