Package org.apache.hadoop.examples.pi

Class DistSum.ReduceSide.PartitionMapper

java.lang.Object

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

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

Enclosing class:

DistSum.ReduceSide

public static class DistSum.ReduceSide.PartitionMapper
extends org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.NullWritable,SummationWritable,org.apache.hadoop.io.IntWritable,SummationWritable>

A Mapper which partitions a summation

Nested Class Summary

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

org.apache.hadoop.mapreduce.Mapper.Context

Constructor Summary

Constructors

Constructor	Description
PartitionMapper()

Method Summary

Modifier and Type	Method	Description
protected void	map(org.apache.hadoop.io.NullWritable nw, SummationWritable sigma, org.apache.hadoop.mapreduce.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

PartitionMapper

public PartitionMapper()

Method Detail

map

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

Partitions sigma into parts

Overrides:

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

Throws:

java.io.IOException

java.lang.InterruptedException