hadoop OutputCollector 源码
haddop OutputCollector 代码
文件路径：/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapred/OutputCollector.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;
/**
* Collects the <code><key, value></code> pairs output by {@link Mapper}s
* and {@link Reducer}s.
*
* <p><code>OutputCollector</code> is the generalization of the facility
* provided by the Map-Reduce framework to collect data output by either the
* <code>Mapper</code> or the <code>Reducer</code> i.e. intermediate outputs
* or the output of the job.</p>
*/
@InterfaceAudience.Public
@InterfaceStability.Stable
public interface OutputCollector<K, V> {
/** Adds a key/value pair to the output.
*
* @param key the key to collect.
* @param value to value to collect.
* @throws IOException
*/
void collect(K key, V value) throws IOException;
}
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