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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HAMA-154) [Performance]Combine multi-mapreduce jobs into a single mapreduce job while computing such as 'C=alpha*B + A'
Date Fri, 06 Mar 2009 02:25:58 GMT

    [ https://issues.apache.org/jira/browse/HAMA-154?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12679473#action_12679473
] 

Hudson commented on HAMA-154:
-----------------------------

+1 overall.  Here are the results of testing the latest attachment 
http://issues.apache.org/jira/secure/attachment/12401492/HAMA-154_v03.patch
against trunk revision 750303.

    @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.

Test results: http://hudson.zones.apache.org/hudson/job/Hama-Patch/163/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Hama-Patch/163/artifact/trunk/build/reports/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Hama-Patch/163/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Hama-Patch/163/console

This message is automatically generated.

> [Performance]Combine multi-mapreduce jobs into a single mapreduce job while computing
such as 'C=alpha*B + A' 
> --------------------------------------------------------------------------------------------------------------
>
>                 Key: HAMA-154
>                 URL: https://issues.apache.org/jira/browse/HAMA-154
>             Project: Hama
>          Issue Type: Improvement
>          Components: implementation
>    Affects Versions: 0.1.0
>            Reporter: Samuel Guo
>             Fix For: 0.1.0
>
>         Attachments: HAMA-154.patch, HAMA-154_v02.patch, HAMA-154_v03.patch
>
>
> now, In Hama we use two map-reduce jobs to do 'C=alpha*B + A'.
> first job is to generate a matrix B' = alpha * B
> second job is to generate the result matrix C = B' + A
> I think the first map-reduce job is unneccesary for we can do the constant-multiplication
during Addition-MapReducing.
> And we also encount the same problem during computing 'A1 + A2 + ... + An'.
> we need to generate (n-1) hbase-tables for the temp results during addition. Can we just
combine n-1 addition-mapreduce jobs into only a simple one?

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