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

java.lang.Object
  org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.NullWritable,SummationWritable,org.apache.hadoop.io.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<org.apache.hadoop.io.NullWritable,SummationWritable,org.apache.hadoop.io.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

DistSum.MapSide.SummingMapper()

Method Summary

protected void

map(org.apache.hadoop.io.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

DistSum.MapSide.SummingMapper

public DistSum.MapSide.SummingMapper()

Method Detail

map

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

Overrides:

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

Throws:

IOException

InterruptedException