Java中如何利用MultipleOutputs控制reduce输出路径

Java中如何利用MultipleOutputs控制reduce输出路径2016-04-02

package com.mr.test;import java.io.IOException;import java.util.Iterator;import java.util.StringTokenizer;import org.apache.hadoop.fs.Path;import org.apache.hadoop.io.IntWritable;import org.apache.hadoop.io.LongWritable;import org.apache.hadoop.io.Text;import org.apache.hadoop.mapred.FileInputFormat;import org.apache.hadoop.mapred.FileOutputFormat;import org.apache.hadoop.mapred.JobClient;import org.apache.hadoop.mapred.JobConf;import org.apache.hadoop.mapred.Mapper;import org.apache.hadoop.mapred.OutputCollector;import org.apache.hadoop.mapred.Reducer;import org.apache.hadoop.mapred.Reporter;import org.apache.hadoop.mapred.TextInputFormat;import org.apache.hadoop.mapred.TextOutputFormat;import org.apache.hadoop.mapred.lib.MultipleOutputs;public class WordCount {public static class MyMap implementsMapper<LongWritable, Text, Text, IntWritable> {private final static IntWritable one = new IntWritable（1）;private Text word = new Text（）;public void map（LongWritable key, Text value,OutputCollector<Text, IntWritable> output, Reporter reporter）throws IOException {String line = value.toString（）;StringTokenizer tokenizer = new StringTokenizer（line）;while （tokenizer.hasMoreTokens（）） {word.set（tokenizer.nextToken（））;output.collect（word, one）;}}public void configure（JobConf arg0） {}public void close（） throws IOException {// TODO Auto-generated method stub}} //public static class MyReduce implementsReducer<Text, IntWritable, Text, IntWritable> {private MultipleOutputs mos;private JobConf jobconf;public void reduce（Text key, Iterator<IntWritable> values,OutputCollector<Text, IntWritable> output, Reporter reporter）throws IOException {int sum = 0;while （values.hasNext（）） {sum += values.next（）.get（）;}mos.getCollector（key.toString（）, reporter）.collect（key, new IntWritable（sum））;//mos.getCollector（key.toString（）,"test", reporter）.collect（key, new IntWritable（sum））;}public void configure（JobConf jobconf） {mos = new MultipleOutputs（jobconf）;this.jobconf = jobconf;}public void close（） throws IOException {mos.close（）;}}public static void main（String[] args） throws Exception {JobConf conf = new JobConf（WordCount.class）;conf.setJobName（"wordcount"）;conf.setOutputKeyClass（Text.class）;conf.setOutputValueClass（IntWritable.class）;conf.setMapperClass（MyMap.class）;conf.setCombinerClass（MyReduce.class）;conf.setReducerClass（MyReduce.class）;conf.setInputFormat（TextInputFormat.class）;conf.setOutputFormat（TextOutputFormat.class）;System.out.println（"args1:"+args[0]）;System.out.println（"args2:"+args[1]）;FileInputFormat.setInputPaths（conf, new Path（args[0]））;FileOutputFormat.setOutputPath（conf, new Path（args[1]））;MultipleOutputs.addNamedOutput（conf, "test1", TextOutputFormat.class, LongWritable.class, Text.class）;MultipleOutputs.addNamedOutput（conf, "test2", TextOutputFormat.class, LongWritable.class, Text.class）;MultipleOutputs.addNamedOutput（conf, "test3", TextOutputFormat.class, LongWritable.class, Text.class）;MultipleOutputs.addNamedOutput（conf, "test4", TextOutputFormat.class, LongWritable.class, Text.class）;MultipleOutputs.addNamedOutput（conf, "test5", TextOutputFormat.class, LongWritable.class, Text.class）;JobClient.runJob（conf）;}}

input.txt:

test1test2test3test4test5

output:

-rw-r--r-- 2 test supergroup 0 2014-04-20 11:23 /chukwa/output/0419-10/_SUCCESSdrwxr-xr-x - test supergroup 0 2014-04-20 11:23 /chukwa/output/0419-10/_logs-rw-r--r-- 2 test supergroup 42 2014-04-20 11:23 /chukwa/output/0419-10/part-00000.lzo-rw-r--r-- 2 test supergroup 58 2014-04-20 11:23 /chukwa/output/0419-10/test1-m-00000.lzo-rw-r--r-- 2 test supergroup 58 2014-04-20 11:23 /chukwa/output/0419-10/test2-m-00000.lzo-rw-r--r-- 2 test supergroup 58 2014-04-20 11:23 /chukwa/output/0419-10/test3-m-00000.lzo-rw-r--r-- 2test supergroup 58 2014-04-20 11:23 /chukwa/output/0419-10/test4-m-00001.lzo-rw-r--r-- 2 test supergroup 58 2014-04-20 11:23 /chukwa/output/0419-10/test5-m-00001.lzo