Package org.apache.hadoop.examples

Class QuasiMonteCarlo.QmcMapper

java.lang.Object

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

org.apache.hadoop.examples.QuasiMonteCarlo.QmcMapper

Enclosing class:

QuasiMonteCarlo

public static class QuasiMonteCarlo.QmcMapper
extends org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.BooleanWritable,org.apache.hadoop.io.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

org.apache.hadoop.mapreduce.Mapper.Context

Constructor Summary

Constructors

Constructor	Description
QmcMapper()

Method Summary

Modifier and Type	Method	Description
void	map(org.apache.hadoop.io.LongWritable offset, org.apache.hadoop.io.LongWritable size, org.apache.hadoop.mapreduce.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

QmcMapper

public QmcMapper()

Method Detail

map

public void map(org.apache.hadoop.io.LongWritable offset,
                org.apache.hadoop.io.LongWritable size,
                org.apache.hadoop.mapreduce.Mapper.Context context)
         throws java.io.IOException,
                java.lang.InterruptedException

Map method.

Overrides:

map in class org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.BooleanWritable,org.apache.hadoop.io.LongWritable>

Parameters:

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

size - the number of samples for this map

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

Throws:

java.io.IOException

java.lang.InterruptedException