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https://issues.apache.org/jira/browse/HADOOP-5819?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12711048#action_12711048
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Tsz Wo (Nicholas), SZE commented on HADOOP-5819:
------------------------------------------------
Computed the following table for the bits of π:
|| || Position || π bits (in hex) ||
| 0 | 1 | 243F6A8885A3 |
| 1 | 11 | FDAA22168C23 |
| 2 | 101 | 3707344A409 |
| 3 | 1,001 | 574E69A458F |
| 4 | 10,001 | 44EC5716F2B |
| 5 | 100,001 | 944F7A204 |
| 6 | 1,000,001 | 6FFFA4103 |
| 7 | 10,000,001 | 6CFDD54E3 |
| 8 | 100,000,001 | A306CFA7 |
| 9 | 1,000,000,001 | 3E08FF2B |
| 10 | 10,000,000,001 | 0A8BD8C0 |
| 11 | 100,000,000,001 | B2238C1 |
| 12 | 1,000,000,000,001 | 0FEE563 |
| 13 | 10,000,000,000,001 | 896DC3 |
| 14 | 100,000,000,000,001 | C216EC |
| 15 | 1,000,000,000,000,001 | 6216B06 |
- For each position n, except the first and the last, also computed π bits
at position n-4 and n+4 for correctness checking.
- Row 0 to Row 7 were run in a single computer. A single run of Row 7 took
several seconds.
- Row 8 to Row 14 were run in a 7600-cpu-core cluster. A single run of Row 14
took 27 hours.
- Row 15 is the result reported in [the YDN
blog|http://developer.yahoo.net/blogs/hadoop/2009/05/hadoop_computes_the_10151st_bi.html].
> Check in the codes that compute the 10^15+1st bit of π
> ------------------------------------------------------
>
> Key: HADOOP-5819
> URL: https://issues.apache.org/jira/browse/HADOOP-5819
> Project: Hadoop Core
> Issue Type: Improvement
> Components: examples
> Reporter: Tsz Wo (Nicholas), SZE
> Assignee: Tsz Wo (Nicholas), SZE
> Attachments: 1e15log.zip, 5819_20090515.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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