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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4437) Use qMC sequence to improve the accuracy of PiEstimator
Date Tue, 04 Nov 2008 19:38:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4437?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12645055#action_12645055
] 

Hadoop QA commented on HADOOP-4437:
-----------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12393275/4437_20081103.patch
  against trunk revision 709609.

    +1 @author.  The patch does not contain any @author tags.

    -1 tests included.  The patch doesn't appear to include any new or modified tests.
                        Please justify why no tests are needed for this patch.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    +1 findbugs.  The patch does not introduce any new Findbugs warnings.

    +1 Eclipse classpath. The patch retains Eclipse classpath integrity.

    +1 core tests.  The patch passed core unit tests.

    +1 contrib tests.  The patch passed contrib unit tests.

Test results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3527/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3527/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3527/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3527/console

This message is automatically generated.

> Use qMC sequence to improve the accuracy of PiEstimator
> -------------------------------------------------------
>
>                 Key: HADOOP-4437
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4437
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: examples
>            Reporter: Tsz Wo (Nicholas), SZE
>            Assignee: Tsz Wo (Nicholas), SZE
>            Priority: Minor
>             Fix For: 0.20.0
>
>         Attachments: 4437_20081019.patch, 4437_20081103.patch
>
>
> Currently, PiEstimator uses java.util.Random to generate random 2d-points for estimating
pi. The numbers generated by java.util.Random are uniformly distributed.  The 2d-points generated
tense to have clump and gap. So the accuracy of the estimated pi is low.  The accuracy can
be improved by using a quasi-Monte Carlo (qMC) sequence.

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