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https://issues.apache.org/jira/browse/MAPREDUCE-1923?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tsz Wo (Nicholas), SZE updated MAPREDUCE-1923:
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Attachment: distbbp20100825.tar.gz
distbbp20100825.tar.gz: 0.20 implementation of distbbp
Again, it needs more works in order to commit it to trunk.
> Support arbitrary precision in the distbbp example
> --------------------------------------------------
>
> Key: MAPREDUCE-1923
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1923
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: examples
> Reporter: Tsz Wo (Nicholas), SZE
> Assignee: Tsz Wo (Nicholas), SZE
> Priority: Minor
> Attachments: distbbp20100825.tar.gz, Mod1Fraction_IntArray.java
>
>
> The precision obtained by _distbbp_ is limited by Java {{double}} (IEEE 754
> 64-bit), which has machine epsilon e=2^(-53). When it is used to compute the
> 10^15 th bit of π, only 26-bit precision with 99.9999998% confident is
> obtained. (Will provide the error analysis later.) It would be great if it
> supports arbitrary precision arithmetics.
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