ValueCountReduce.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.streaming;
- import java.io.*;
- import java.util.Date;
- import java.io.IOException;
- import java.util.Iterator;
- import org.apache.hadoop.io.Text;
- import org.apache.hadoop.io.WritableComparable;
- import org.apache.hadoop.mapred.JobConf;
- import org.apache.hadoop.mapred.OutputCollector;
- import org.apache.hadoop.mapred.Reducer;
- import org.apache.hadoop.mapred.Reporter;
- public class ValueCountReduce implements Reducer {
- /**
- * @param args
- */
- public static void main(String[] args) {
- // TODO Auto-generated method stub
- }
- public void reduce(Object arg0, Iterator arg1, OutputCollector arg2, Reporter arg3) throws IOException {
- int count = 0;
- while (arg1.hasNext()) {
- count += 1;
- arg1.next();
- }
- arg2.collect(arg0, new Text("" + count));
- }
- public void configure(JobConf arg0) {
- // TODO Auto-generated method stub
-
- }
- public void close() throws IOException {
- // TODO Auto-generated method stub
-
- }
- }