org.apache.hadoop.examples.pi

Class DistBbp

java.lang.Object

org.apache.hadoop.conf.Configured

org.apache.hadoop.examples.pi.DistBbp

All Implemented Interfaces:

Configurable, Tool

public final class DistBbp
extends Configured
implements Tool

A map/reduce program that uses a BBP-type method to compute exact binary digits of Pi. This program is designed for computing the n th bit of Pi, for large n, say n >= 10^8. For computing lower bits of Pi, consider using bbp. The actually computation is done by DistSum jobs. The steps for launching the jobs are: (1) Initialize parameters. (2) Create a list of sums. (3) Read computed values from the given local directory. (4) Remove the computed values from the sums. (5) Partition the remaining sums into computation jobs. (6) Submit the computation jobs to a cluster and then wait for the results. (7) Write job outputs to the given local directory. (8) Combine the job outputs and print the Pi bits.

Field Summary

Fields

Modifier and Type	Field and Description
static String	DESCRIPTION

Constructor Summary

Constructors

Constructor and Description
DistBbp()

Method Summary

Methods

Modifier and Type	Method and Description
static void	main(String[] args) main
int	run(String[] args) Execute the command with the given arguments.

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 String DESCRIPTION

See Also:

Constant Field Values

Constructor Detail

DistBbp

public DistBbp()

Method Detail

run

public int run(String[] args)
        throws Exception

Execute the command with the given arguments.

Specified by:

run in interface Tool

Parameters:

args - command specific arguments.

Returns:

exit code.

Throws:

Exception

main

public static void main(String[] args)
                 throws Exception

main

Throws:

Exception