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From: Apache Wiki <wikidiffs@apache.org>
To: Apache Wiki <wikidiffs@apache.org>
Date: Sun, 28 Nov 2010 18:22:19 -0000
Message-ID: <20101128182219.77592.49799@eosnew.apache.org>
Subject: 
 =?utf-8?q?=5BHadoop_Wiki=5D_Update_of_=22WordCount=22_by_RobinWenglewski?=

Dear Wiki user,

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The "WordCount" page has been changed by RobinWenglewski.
The comment on this change is: example updated to new API.
http://wiki.apache.org/hadoop/WordCount?action=3Ddiff&rev1=3D12&rev2=3D13

--------------------------------------------------

  import org.apache.hadoop.fs.Path;
  import org.apache.hadoop.conf.*;
  import org.apache.hadoop.io.*;
- import org.apache.hadoop.mapred.*;
+ import org.apache.hadoop.mapreduce.*;
- import org.apache.hadoop.util.*;
+ import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
+ import org.apache.hadoop.mapreduce.lib.input.TextInputFormat;
+ import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
+ import org.apache.hadoop.mapreduce.lib.output.TextOutputFormat;
   	=

  public class WordCount {
   	=

-  public static class Map extends MapReduceBase implements Mapper<LongWrit=
able, Text, Text, IntWritable> {
+  public static class Map extends Mapper<LongWritable, Text, Text, IntWrit=
able> {
      private final static IntWritable one =3D new IntWritable(1);
      private Text word =3D new Text();
   	=

-     public void map(LongWritable key, Text value, OutputCollector<Text, I=
ntWritable> output, Reporter reporter) throws IOException {
+     public void map(LongWritable key, Text value, Context context) throws=
 IOException, InterruptedException {
          String line =3D value.toString();
   	StringTokenizer tokenizer =3D new StringTokenizer(line);
   	while (tokenizer.hasMoreTokens()) {
   	    word.set(tokenizer.nextToken());
-  	    output.collect(word, one);
+  	    context.write(word, one);
   	}
      }
   } =

   	=

-  public static class Reduce extends MapReduceBase implements Reducer<Text=
, IntWritable, Text, IntWritable> {
+  public static class Reduce extends Reducer<Text, IntWritable, Text, IntW=
ritable> {
  =

-     public void reduce(Text key, Iterator<IntWritable> values, OutputColl=
ector<Text, IntWritable> output, Reporter reporter) throws IOException {
+     public void reduce(Text key, Iterator<IntWritable> values, Context co=
ntext) =

+       throws IOException, InterruptedException {
          int sum =3D 0;
   	while (values.hasNext()) {
   	    sum +=3D values.next().get();
   	}
-  	output.collect(key, new IntWritable(sum));
+  	context.write(key, new IntWritable(sum));
      }
   }
   	=

   public static void main(String[] args) throws Exception {
-     JobConf conf =3D new JobConf(WordCount.class);
-     conf.setJobName("wordcount");
+     Configuration conf =3D new Configuration();
+ 	=

+ 	Job job =3D new Job(conf, "wordcount");
+     =

+     job.setOutputKeyClass(Text.class);
+     job.setOutputValueClass(IntWritable.class);
+ 	=

+     job.setMapperClass(Map.class);
+     job.setReducerClass(Reduce.class);
   	=

+     job.setInputFormatClass(TextInputFormat.class);
+     job.setOutputFormatClass(TextOutputFormat.class);
-     conf.setOutputKeyClass(Text.class);
-     conf.setOutputValueClass(IntWritable.class);
- 	=

-     conf.setMapperClass(Map.class);
-     conf.setCombinerClass(Reduce.class);
-     conf.setReducerClass(Reduce.class);
   	=

-     conf.setInputFormat(TextInputFormat.class);
-     conf.setOutputFormat(TextOutputFormat.class);
+     FileInputFormat.addInputPath(job, new Path(args[0]));
+     FileOutputFormat.setOutputPath(job, new Path(args[1]));
   	=

+     job.waitForCompletion(true);
-     FileInputFormat.setInputPaths(conf, new Path(args[0]));
-     FileOutputFormat.setOutputPath(conf, new Path(args[1]));
-  	=

-     JobClient.runJob(conf);
   }
   	=

  }