Package 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
@Stable
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

org.apache.hadoop.mapreduce.Mapper.Context

Constructor Summary

Constructors

Constructor	Description
InverseMapper()

Method Summary

Modifier and Type	Method	Description
void	map(K key, V value, Mapper<K,V,V,K>.org.apache.hadoop.mapreduce.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 Details

InverseMapper

public InverseMapper()

Method Details

map

public void map(K key,
 V value,
 Mapper<K,V,V,K>.org.apache.hadoop.mapreduce.Mapper.Context context)
         throws IOException,
InterruptedException

The inverse function. Input keys and values are swapped.

Overrides:

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

Throws:

IOException

InterruptedException