hadoop RecordWriter 源码

  • 2022-10-20
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haddop RecordWriter 代码

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

import java.io.IOException;

import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.fs.FileSystem;

/**
 * <code>RecordWriter</code> writes the output &lt;key, value&gt; pairs 
 * to an output file.
 
 * <p><code>RecordWriter</code> implementations write the job outputs to the
 * {@link FileSystem}.
 * 
 * @see OutputFormat
 */
@InterfaceAudience.Public
@InterfaceStability.Stable
public abstract class RecordWriter<K, V> {
  /** 
   * Writes a key/value pair.
   *
   * @param key the key to write.
   * @param value the value to write.
   * @throws IOException
   */      
  public abstract void write(K key, V value
                             ) throws IOException, InterruptedException;

  /** 
   * Close this <code>RecordWriter</code> to future operations.
   * 
   * @param context the context of the task
   * @throws IOException
   */ 
  public abstract void close(TaskAttemptContext context
                             ) throws IOException, InterruptedException;
}

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