org.apache.hadoop.examples

Class QuasiMonteCarlo.QmcMapper

java.lang.Object

org.apache.hadoop.mapreduce.Mapper<LongWritable,LongWritable,BooleanWritable,LongWritable>

org.apache.hadoop.examples.QuasiMonteCarlo.QmcMapper

Enclosing class:

QuasiMonteCarlo

public static class QuasiMonteCarlo.QmcMapper
extends Mapper<LongWritable,LongWritable,BooleanWritable,LongWritable>

Mapper class for Pi estimation. Generate points in a unit square and then count points inside/outside of the inscribed circle of the square.

Nested Class Summary

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

Mapper.Context

Constructor Summary

Constructors

Constructor and Description
QuasiMonteCarlo.QmcMapper()

Method Summary

Methods

Modifier and Type	Method and Description
void	map(LongWritable offset, LongWritable size, Mapper.Context context) Map method.

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

QuasiMonteCarlo.QmcMapper

public QuasiMonteCarlo.QmcMapper()

Method Detail

map

public void map(LongWritable offset,
       LongWritable size,
       Mapper.Context context)
         throws IOException,
                InterruptedException

Map method.

Overrides:

map in class Mapper<LongWritable,LongWritable,BooleanWritable,LongWritable>

Parameters:

offset - samples starting from the (offset+1)th sample.

size - the number of samples for this map

context - output {ture->numInside, false->numOutside}

Throws:

IOException

InterruptedException