hadoop MapOutputFile 源码

  • 2022-10-20
  • 浏览 (96)

haddop MapOutputFile 代码

文件路径:/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapred/MapOutputFile.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.mapred;

import java.io.IOException;

import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configurable;
import org.apache.hadoop.fs.Path;

/**
 * Manipulate the working area for the transient store for maps and reduces.
 *
 * This class is used by map and reduce tasks to identify the directories that
 * they need to write to/read from for intermediate files. The callers of
 * these methods are from child space and see mapreduce.cluster.local.dir as
 * taskTracker/jobCache/jobId/attemptId
 * This class should not be used from TaskTracker space.
 */
@InterfaceAudience.Private
@InterfaceStability.Unstable
public abstract class MapOutputFile implements Configurable {

  private Configuration conf;

  static final String MAP_OUTPUT_FILENAME_STRING = "file.out";
  static final String MAP_OUTPUT_INDEX_SUFFIX_STRING = ".index";
  static final String REDUCE_INPUT_FILE_FORMAT_STRING = "%s/map_%d.out";

  public MapOutputFile() {
  }

  /**
   * Return the path to local map output file created earlier
   *
   * @return path
   * @throws IOException
   */
  public abstract Path getOutputFile() throws IOException;

  /**
   * Create a local map output file name.
   *
   * @param size the size of the file
   * @return path
   * @throws IOException
   */
  public abstract Path getOutputFileForWrite(long size) throws IOException;

  /**
   * Create a local map output file name on the same volume.
   */
  public abstract Path getOutputFileForWriteInVolume(Path existing);

  /**
   * Return the path to a local map output index file created earlier
   *
   * @return path
   * @throws IOException
   */
  public abstract Path getOutputIndexFile() throws IOException;

  /**
   * Create a local map output index file name.
   *
   * @param size the size of the file
   * @return path
   * @throws IOException
   */
  public abstract Path getOutputIndexFileForWrite(long size) throws IOException;

  /**
   * Create a local map output index file name on the same volume.
   */
  public abstract Path getOutputIndexFileForWriteInVolume(Path existing);

  /**
   * Return a local map spill file created earlier.
   *
   * @param spillNumber the number
   * @return path
   * @throws IOException
   */
  public abstract Path getSpillFile(int spillNumber) throws IOException;

  /**
   * Create a local map spill file name.
   *
   * @param spillNumber the number
   * @param size the size of the file
   * @return path
   * @throws IOException
   */
  public abstract Path getSpillFileForWrite(int spillNumber, long size)
      throws IOException;

  /**
   * Return a local map spill index file created earlier
   *
   * @param spillNumber the number
   * @return path
   * @throws IOException
   */
  public abstract Path getSpillIndexFile(int spillNumber) throws IOException;

  /**
   * Create a local map spill index file name.
   *
   * @param spillNumber the number
   * @param size the size of the file
   * @return path
   * @throws IOException
   */
  public abstract Path getSpillIndexFileForWrite(int spillNumber, long size)
      throws IOException;

  /**
   * Return a local reduce input file created earlier
   *
   * @param mapId a map task id
   * @return path
   * @throws IOException
   */
  public abstract Path getInputFile(int mapId) throws IOException;

  /**
   * Create a local reduce input file name.
   *
   * @param mapId a map task id
   * @param size the size of the file
   * @return path
   * @throws IOException
   */
  public abstract Path getInputFileForWrite(
      org.apache.hadoop.mapreduce.TaskID mapId, long size) throws IOException;

  /** Removes all of the files related to a task. */
  public abstract void removeAll() throws IOException;

  @Override
  public void setConf(Configuration conf) {
    this.conf = conf;
  }

  @Override
  public Configuration getConf() {
    return conf;
  }

}

相关信息

hadoop 源码目录

相关文章

hadoop AMFeedback 源码

hadoop BackupStore 源码

hadoop BasicTypeSorterBase 源码

hadoop BufferSorter 源码

hadoop CleanupQueue 源码

hadoop Clock 源码

hadoop ClusterStatus 源码

hadoop Counters 源码

hadoop CumulativePeriodicStats 源码

hadoop DeprecatedQueueConfigurationParser 源码

0  赞