Class AggregateWordCount

  extended by org.apache.hadoop.examples.AggregateWordCount

public class AggregateWordCount
extends Object

This is an example Aggregated Hadoop Map/Reduce application. It reads the text input files, breaks each line into words and counts them. The output is a locally sorted list of words and the count of how often they occurred. To run: bin/hadoop jar hadoop-examples-*.jar aggregatewordcount in-dir out-dir numOfReducers textinputformat

Nested Class Summary
static class AggregateWordCount.WordCountPlugInClass
Constructor Summary
Method Summary
static void main(String[] args)
          The main driver for word count map/reduce program.
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail


public AggregateWordCount()
Method Detail


public static void main(String[] args)
                 throws IOException
The main driver for word count map/reduce program. Invoke this method to submit the map/reduce job.

IOException - When there is communication problems with the job tracker.

Copyright © 2009 The Apache Software Foundation