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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-637) Check in the codes that compute the 10^15+1st bit of π
Date Wed, 01 Jul 2009 01:18:47 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-637?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12725883#action_12725883
] 

Tsz Wo (Nicholas), SZE commented on MAPREDUCE-637:
--------------------------------------------------

The last row of [the table|https://issues.apache.org/jira/browse/MAPREDUCE-637?focusedCommentId=12711048&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#action_12711048]
should be updated to
|15|1,000,000,000,000,001|6216B06 ... D3611|
- The second part (D3611)
-* Starting at position 1,000,000,000,000,053.
-* Totally 20 bits.
-* The last bit, the 1,000,000,000,000,072nd bit, probably is the highest bits computed ever
in the history.
-* Computed by totally 14,000 jobs, 7,000,000 tasks, 208 years of cpu-time and 12 days of
cluster time.

> Check in the codes that compute the 10^15+1st bit of π
> ------------------------------------------------------
>
>                 Key: MAPREDUCE-637
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-637
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: examples
>            Reporter: Tsz Wo (Nicholas), SZE
>            Assignee: Tsz Wo (Nicholas), SZE
>         Attachments: 1e15log.zip, 5819_20090515.patch, 5819_20090523.patch, 5819_20090527.patch,
m637_20090624.patch, m637_20090630.patch
>
>
> We have an improved version of the current BaileyBorwinPlouffe example, which able to
compute at least the10^15+1st bit of π.  See also http://developer.yahoo.net/blogs/hadoop/2009/05/hadoop_computes_the_10151st_bi.html

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