org.apache.hadoop.examples.pi

Class DistSum.MapSide.SummingMapper

java.lang.Object

org.apache.hadoop.mapreduce.Mapper<NullWritable,SummationWritable,NullWritable,TaskResult>

org.apache.hadoop.examples.pi.DistSum.MapSide.SummingMapper

Enclosing class:

DistSum.MapSide

public static class DistSum.MapSide.SummingMapper
extends org.apache.hadoop.mapreduce.Mapper<NullWritable,SummationWritable,NullWritable,TaskResult>

A mapper which computes sums

Nested Class Summary

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

org.apache.hadoop.mapreduce.Mapper.Context

Constructor Summary

Constructors

Constructor and Description
SummingMapper()

Method Summary

Modifier and Type	Method and Description
protected void	map(NullWritable nw, SummationWritable sigma, org.apache.hadoop.mapreduce.Mapper.Context context)

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 Detail

SummingMapper

public SummingMapper()

Method Detail

map

protected void map(NullWritable nw,
                   SummationWritable sigma,
                   org.apache.hadoop.mapreduce.Mapper.Context context)
            throws IOException,
                   InterruptedException

Overrides:

map in class org.apache.hadoop.mapreduce.Mapper<NullWritable,SummationWritable,NullWritable,TaskResult>

Throws:

IOException

InterruptedException