org.apache.hadoop.examples

Class SecondarySort.Reduce

java.lang.Object

org.apache.hadoop.mapreduce.Reducer<SecondarySort.IntPair,org.apache.hadoop.io.IntWritable,org.apache.hadoop.io.Text,org.apache.hadoop.io.IntWritable>

org.apache.hadoop.examples.SecondarySort.Reduce

Enclosing class:

SecondarySort

public static class SecondarySort.Reduce
extends Reducer<SecondarySort.IntPair,org.apache.hadoop.io.IntWritable,org.apache.hadoop.io.Text,org.apache.hadoop.io.IntWritable>

A reducer class that just emits the sum of the input values.

Nested Class Summary

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

Reducer.Context

Constructor Summary

Constructors

Constructor and Description
SecondarySort.Reduce()

Method Summary

Methods

Modifier and Type	Method and Description
void	reduce(SecondarySort.IntPair key, java.lang.Iterable<org.apache.hadoop.io.IntWritable> values, Reducer.Context context) This method is called once for each key.

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

cleanup, run, setup

Methods inherited from class java.lang.Object

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

Constructor Detail

SecondarySort.Reduce

public SecondarySort.Reduce()

Method Detail

reduce

public void reduce(SecondarySort.IntPair key,
          java.lang.Iterable<org.apache.hadoop.io.IntWritable> values,
          Reducer.Context context)
            throws java.io.IOException,
                   java.lang.InterruptedException

Description copied from class: Reducer

This method is called once for each key. Most applications will define their reduce class by overriding this method. The default implementation is an identity function.

Overrides:

reduce in class Reducer<SecondarySort.IntPair,org.apache.hadoop.io.IntWritable,org.apache.hadoop.io.Text,org.apache.hadoop.io.IntWritable>

Throws:

java.io.IOException

java.lang.InterruptedException