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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (PIG-480) PERFORMANCE: Use identity mapper in a chain of M-R jobs
Date Thu, 07 Jan 2010 05:23:54 GMT

    [ https://issues.apache.org/jira/browse/PIG-480?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12797518#action_12797518
] 

Hadoop QA commented on PIG-480:
-------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12429598/PIG_480.patch
  against trunk revision 896606.

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

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

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

    -1 javac.  The applied patch generated 230 javac compiler warnings (more than the trunk's
current 212 warnings).

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

    -1 release audit.  The applied patch generated 482 release audit warnings (more than the
trunk's current 481 warnings).

    -1 core tests.  The patch failed core unit tests.

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

Test results: http://hudson.zones.apache.org/hudson/job/Pig-Patch-h8.grid.sp2.yahoo.net/168/testReport/
Release audit warnings: http://hudson.zones.apache.org/hudson/job/Pig-Patch-h8.grid.sp2.yahoo.net/168/artifact/trunk/patchprocess/releaseAuditDiffWarnings.txt
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Pig-Patch-h8.grid.sp2.yahoo.net/168/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Console output: http://hudson.zones.apache.org/hudson/job/Pig-Patch-h8.grid.sp2.yahoo.net/168/console

This message is automatically generated.

> PERFORMANCE: Use identity mapper in a chain of M-R jobs
> -------------------------------------------------------
>
>                 Key: PIG-480
>                 URL: https://issues.apache.org/jira/browse/PIG-480
>             Project: Pig
>          Issue Type: Improvement
>    Affects Versions: 0.2.0
>            Reporter: Olga Natkovich
>            Assignee: Ying He
>         Attachments: PIG_480.patch, PIG_480.patch, PIG_480.patch
>
>
> For jobs with two or more MR jobs, use identity mapper wherever possible in second and
subsequent MR jobs. Identity mapper is about 50% than pig empty map job because it doesn't
parse the data. 

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