org.apache.hadoop.mapred.lib

类 InverseMapper<K,V>

java.lang.Object

org.apache.hadoop.mapred.MapReduceBase

org.apache.hadoop.mapred.lib.InverseMapper<K,V>

所有已实现的接口:

Closeable, AutoCloseable, JobConfigurable, Mapper<K,V,V,K>

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

A Mapper that swaps keys and values.

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, OutputCollector<V,K> output, Reporter reporter) The inverse function.

从类继承的方法 org.apache.hadoop.mapred.MapReduceBase

close, configure

从类继承的方法 java.lang.Object

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

从接口继承的方法 org.apache.hadoop.mapred.JobConfigurable

configure

从接口继承的方法 java.io.Closeable

close

构造器详细资料

InverseMapper

public InverseMapper()

方法详细资料

map

public void map(K key,
       V value,
       OutputCollector<V,K> output,
       Reporter reporter)
         throws IOException

The inverse function. Input keys and values are swapped.

指定者:

map 在接口中 Mapper<K,V,V,K>

参数:

key - the input key.

value - the input value.

output - collects mapped keys and values.

reporter - facility to report progress.

抛出:

IOException