org.apache.hadoop.mapreduce.lib.map

类 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.

嵌套类概要

从类继承的嵌套类/接口 org.apache.hadoop.mapreduce.Mapper

Mapper.Context

构造器概要

构造器

构造器和说明
InverseMapper()

方法概要

方法

限定符和类型	方法和说明
void	map(K key, V value, Mapper.Context context) The inverse function.

从类继承的方法 org.apache.hadoop.mapreduce.Mapper

cleanup, run, setup

从类继承的方法 java.lang.Object

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

构造器详细资料

InverseMapper

public InverseMapper()

方法详细资料

map

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

The inverse function. Input keys and values are swapped.

覆盖:

map 在类中 Mapper<K,V,V,K>

抛出:

IOException

InterruptedException