IdentityReducer.java
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上传日期:2018-01-08
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- /**
- * 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.lib;
- import java.io.IOException;
- import java.util.Iterator;
- import org.apache.hadoop.mapred.Reducer;
- import org.apache.hadoop.mapred.OutputCollector;
- import org.apache.hadoop.mapred.Reporter;
- import org.apache.hadoop.mapred.MapReduceBase;
- /** Performs no reduction, writing all input values directly to the output.
- * @deprecated Use {@link org.apache.hadoop.mapreduce.Reducer} instead.
- */
- @Deprecated
- public class IdentityReducer<K, V>
- extends MapReduceBase implements Reducer<K, V, K, V> {
- /** Writes all keys and values directly to output. */
- public void reduce(K key, Iterator<V> values,
- OutputCollector<K, V> output, Reporter reporter)
- throws IOException {
- while (values.hasNext()) {
- output.collect(key, values.next());
- }
- }
-
- }