hadoop RecordWriter 源码
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 <key, value> 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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