org.apache.hadoop.mapreduce.lib.map
Class InverseMapper<K,V>

java.lang.Object
  org.apache.hadoop.mapreduce.Mapper<K,V,V,K>
      org.apache.hadoop.mapreduce.lib.map.InverseMapper<K,V>

public class InverseMapper<K,V>
extends Mapper<K,V,V,K>

A Mapper that swaps keys and values.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.hadoop.mapreduce.Mapper

Mapper.Context

Constructor Summary

InverseMapper()

Method Summary

void	map(K key, V value, Mapper.Context context) The inverse function.

Methods inherited from class org.apache.hadoop.mapreduce.Mapper

cleanup, run, setup

Methods inherited from class java.lang.Object

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

Constructor Detail

InverseMapper

public InverseMapper()

Method Detail

map

public void map(K key,
                V value,
                Mapper.Context context)
         throws java.io.IOException,
                java.lang.InterruptedException

The inverse function. Input keys and values are swapped.

Overrides:

map in class Mapper<K,V,V,K>

Throws:

java.io.IOException

java.lang.InterruptedException