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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] Created: (MAPREDUCE-1923) Support arbitrary precision in the distbbp example
Date Wed, 07 Jul 2010 03:23:49 GMT
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

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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