org.apache.hadoop.examples.pi

Class DistSum.ReduceSide.SummingReducer

java.lang.Object

org.apache.hadoop.mapreduce.Reducer<org.apache.hadoop.io.IntWritable,SummationWritable,org.apache.hadoop.io.NullWritable,TaskResult>

org.apache.hadoop.examples.pi.DistSum.ReduceSide.SummingReducer

Enclosing class:

DistSum.ReduceSide

public static class DistSum.ReduceSide.SummingReducer
extends org.apache.hadoop.mapreduce.Reducer<org.apache.hadoop.io.IntWritable,SummationWritable,org.apache.hadoop.io.NullWritable,TaskResult>

A Reducer which computes sums

Nested Class Summary

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

org.apache.hadoop.mapreduce.Reducer.Context

Constructor Summary

Constructors

Constructor and Description
SummingReducer()

Method Summary

Modifier and Type	Method and Description
protected void	reduce(org.apache.hadoop.io.IntWritable index, Iterable<SummationWritable> sums, org.apache.hadoop.mapreduce.Reducer.Context context)

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

SummingReducer

public SummingReducer()

Method Detail

reduce

protected void reduce(org.apache.hadoop.io.IntWritable index,
                      Iterable<SummationWritable> sums,
                      org.apache.hadoop.mapreduce.Reducer.Context context)
               throws IOException,
                      InterruptedException

Overrides:

reduce in class org.apache.hadoop.mapreduce.Reducer<org.apache.hadoop.io.IntWritable,SummationWritable,org.apache.hadoop.io.NullWritable,TaskResult>

Throws:

IOException

InterruptedException