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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-287) Speed up SequenceFile sort with memory reduction
Date Sun, 03 Feb 2008 03:34:09 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-287?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12565140#action_12565140
] 

Hadoop QA commented on HADOOP-287:
----------------------------------

-1 overall.  Here are the results of testing the latest attachment 
http://issues.apache.org/jira/secure/attachment/12374623/287-2.patch
against trunk revision 616796.

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

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

    javac -1.  The applied patch generated 618 javac compiler warnings (more than the trunk's
current 617 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/1730/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/1730/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/1730/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/1730/console

This message is automatically generated.

> Speed up SequenceFile sort with memory reduction
> ------------------------------------------------
>
>                 Key: HADOOP-287
>                 URL: https://issues.apache.org/jira/browse/HADOOP-287
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: io
>    Affects Versions: 0.17.0
>            Reporter: Benjamin Reed
>            Assignee: Doug Cutting
>         Attachments: 287-0.patch, 287-1.patch, 287-2.patch, s.patch, zoom-sort.patch,
zoom-sort.patch
>
>
> I replaced the merge sort with a quick sort and it yielded approx 30% improvement in
sort time. It also reduced the memory requirement for sorting because the sort is done in
place.

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