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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3308) Improve QuickSort by excluding values eq the pivot from the partition
Date Fri, 25 Apr 2008 00:41:56 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3308?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12592227#action_12592227
] 

Hadoop QA commented on HADOOP-3308:
-----------------------------------

+1 overall.  Here are the results of testing the latest attachment 
http://issues.apache.org/jira/secure/attachment/12380881/3308-1.patch
against trunk revision 645773.

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

    tests included +1.  The patch appears to include 3 new or modified tests.

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

    javac +1.  The applied patch does not generate any new javac compiler warnings.

    release audit +1.  The applied patch does not generate any new release audit warnings.

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

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

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

Test results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2319/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2319/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2319/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2319/console

This message is automatically generated.

> Improve QuickSort by excluding values eq the pivot from the partition
> ---------------------------------------------------------------------
>
>                 Key: HADOOP-3308
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3308
>             Project: Hadoop Core
>          Issue Type: Improvement
>            Reporter: Chris Douglas
>            Assignee: Chris Douglas
>             Fix For: 0.18.0
>
>         Attachments: 3308-0.patch, 3308-1.patch
>
>
> The current implementation of QuickSort naively partitions on either side of the pivot.
We can improve this by partitioning on either side of the set of values equal to the pivot.
This assumes that comparing keys is expensive compared to swaps and index comparisons (which
it certainly is in MapTask, and should be in general).

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