com.aliyun.odps.mapred.example

Class WordCount

java.lang.Object

com.aliyun.odps.mapred.example.WordCount

public class WordCount
extends Object

This is an example ODPS Map/Reduce application. It reads the input table, map each column into words and counts them. The output is a locally sorted list of words and the count of how often they occurred.

To run: mapreduce -libjars mapreduce-examples.jar com.aliyun.odps.mapreduce.examples.WordCount in-tbl out-tbl

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	WordCount.SumCombiner A combiner class that combines map output by sum them.
static class	WordCount.SumReducer A reducer class that just emits the sum of the input values.
static class	WordCount.TokenizerMapper Counts the words in each record.

Constructor Summary

Constructors

Constructor and Description
WordCount()

Method Summary

Modifier and Type	Method and Description
static void	main(String[] args)

Methods inherited from class java.lang.Object

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

Constructor Detail

WordCount

public WordCount()

Method Detail

main

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

Throws:

OdpsException