Package org.apache.hadoop.examples

Class BaileyBorweinPlouffe

java.lang.Object

org.apache.hadoop.conf.Configured

org.apache.hadoop.examples.BaileyBorweinPlouffe

All Implemented Interfaces:

org.apache.hadoop.conf.Configurable, org.apache.hadoop.util.Tool

public class BaileyBorweinPlouffe
extends org.apache.hadoop.conf.Configured
implements org.apache.hadoop.util.Tool

A map/reduce program that uses Bailey-Borwein-Plouffe to compute exact digits of Pi. This program is able to calculate digit positions lower than a certain limit, which is roughly 10^8. If the limit is exceeded, the corresponding results may be incorrect due to overflow errors. For computing higher bits of Pi, consider using distbbp. Reference: [1] David H. Bailey, Peter B. Borwein and Simon Plouffe. On the Rapid Computation of Various Polylogarithmic Constants. Math. Comp., 66:903-913, 1996.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	BaileyBorweinPlouffe.BbpInputFormat	Input format for the BaileyBorweinPlouffe.BbpMapper.
static class	BaileyBorweinPlouffe.BbpMapper	Mapper class computing digits of Pi.
static class	BaileyBorweinPlouffe.BbpReducer	Reducer for concatenating map outputs.
static class	BaileyBorweinPlouffe.BbpSplit	Input split for the BaileyBorweinPlouffe.BbpInputFormat.

Field Summary

Fields

Modifier and Type	Field	Description
static java.lang.String	DESCRIPTION

Constructor Summary

Constructors

Constructor	Description
BaileyBorweinPlouffe()

Method Summary

Modifier and Type	Method	Description
static void	main(java.lang.String[] argv)	The main method for running it as a stand alone command.
int	run(java.lang.String[] args)	Parse arguments and then runs a map/reduce job.

Methods inherited from class org.apache.hadoop.conf.Configured

getConf, setConf

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.apache.hadoop.conf.Configurable

getConf, setConf

Field Detail

DESCRIPTION

public static final java.lang.String DESCRIPTION

See Also:

Constant Field Values

Constructor Detail

BaileyBorweinPlouffe

public BaileyBorweinPlouffe()

Method Detail

run

public int run(java.lang.String[] args)
        throws java.io.IOException

Parse arguments and then runs a map/reduce job.

Specified by:

run in interface org.apache.hadoop.util.Tool

Returns:

a non-zero value if there is an error. Otherwise, return 0.

Throws:

java.io.IOException

main

public static void main(java.lang.String[] argv)
                 throws java.lang.Exception

The main method for running it as a stand alone command.

Throws:

java.lang.Exception