org.apache.hadoop.examples
Class WordMean

java.lang.Object
  org.apache.hadoop.conf.Configured
      org.apache.hadoop.examples.WordMean

All Implemented Interfaces:

org.apache.hadoop.conf.Configurable, org.apache.hadoop.util.Tool

public class WordMean
extends org.apache.hadoop.conf.Configured
implements org.apache.hadoop.util.Tool

Nested Class Summary

static class	WordMean.WordMeanMapper Maps words from line of text into 2 key-value pairs; one key-value pair for counting the word, another for counting its length.
static class	WordMean.WordMeanReducer Performs integer summation of all the values for each key.

Constructor Summary

WordMean()

Method Summary

double	getMean() Only valuable after run() called.
static void	main(String[] args)
int	run(String[] args)

Methods inherited from class org.apache.hadoop.conf.Configured

getConf, setConf

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.apache.hadoop.conf.Configurable

getConf, setConf

Constructor Detail

WordMean

public WordMean()

Method Detail

main

public static void main(String[] args)
                 throws Exception

Throws:

Exception

run

public int run(String[] args)
        throws Exception

Specified by:

run in interface org.apache.hadoop.util.Tool

Throws:

Exception

getMean

public double getMean()

Only valuable after run() called.

Returns:

Returns the mean value.