[120] | 1 | /** |
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| 2 | * Licensed to the Apache Software Foundation (ASF) under one |
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| 3 | * or more contributor license agreements. See the NOTICE file |
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| 4 | * distributed with this work for additional information |
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| 5 | * regarding copyright ownership. The ASF licenses this file |
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| 6 | * to you under the Apache License, Version 2.0 (the |
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| 7 | * "License"); you may not use this file except in compliance |
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| 8 | * with the License. You may obtain a copy of the License at |
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| 9 | * |
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| 10 | * http://www.apache.org/licenses/LICENSE-2.0 |
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| 11 | * |
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| 12 | * Unless required by applicable law or agreed to in writing, software |
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| 13 | * distributed under the License is distributed on an "AS IS" BASIS, |
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| 14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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| 15 | * See the License for the specific language governing permissions and |
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| 16 | * limitations under the License. |
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| 17 | */ |
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| 18 | |
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| 19 | package org.apache.hadoop.mapreduce.lib.reduce; |
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| 20 | |
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| 21 | import java.io.IOException; |
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| 22 | |
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| 23 | import org.apache.hadoop.io.IntWritable; |
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| 24 | import org.apache.hadoop.mapreduce.Reducer; |
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| 25 | |
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| 26 | public class IntSumReducer<Key> extends Reducer<Key,IntWritable, |
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| 27 | Key,IntWritable> { |
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| 28 | private IntWritable result = new IntWritable(); |
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| 29 | |
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| 30 | public void reduce(Key key, Iterable<IntWritable> values, |
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| 31 | Context context) throws IOException, InterruptedException { |
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| 32 | int sum = 0; |
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| 33 | for (IntWritable val : values) { |
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| 34 | sum += val.get(); |
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| 35 | } |
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| 36 | result.set(sum); |
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| 37 | context.write(key, result); |
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| 38 | } |
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| 39 | |
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| 40 | } |
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