org.apache.hadoop.examples.pi

Class DistSum.ReduceSide.PartitionMapper

java.lang.Object

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

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

Enclosing class:

DistSum.ReduceSide

public static class DistSum.ReduceSide.PartitionMapper
extends Mapper<NullWritable,SummationWritable,IntWritable,SummationWritable>

A Mapper which partitions a summation

Nested Class Summary

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

Mapper.Context

Constructor Summary

Constructors

Constructor and Description
DistSum.ReduceSide.PartitionMapper()

Method Summary

Methods

Modifier and Type	Method and Description
protected void	map(NullWritable nw, SummationWritable sigma, Mapper.Context context) Partitions sigma into parts

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

DistSum.ReduceSide.PartitionMapper

public DistSum.ReduceSide.PartitionMapper()

Method Detail

map

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

Partitions sigma into parts

Overrides:

map in class Mapper<NullWritable,SummationWritable,IntWritable,SummationWritable>

Throws:

IOException

InterruptedException