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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (PIG-792) PERFORMANCE: Support skewed join in pig
Date Fri, 03 Jul 2009 18:59:47 GMT

    [ https://issues.apache.org/jira/browse/PIG-792?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12727096#action_12727096
] 

Hadoop QA commented on PIG-792:
-------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12412434/skewedjoin.patch
  against trunk revision 790735.

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

    +1 tests included.  The patch appears to include 4 new or modified tests.

    -1 javadoc.  The javadoc tool appears to have generated 1 warning messages.

    -1 javac.  The applied patch generated 263 javac compiler warnings (more than the trunk's
current 250 warnings).

    -1 findbugs.  The patch appears to introduce 14 new Findbugs warnings.

    -1 release audit.  The applied patch generated 162 release audit warnings (more than the
trunk's current 161 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-minerva.apache.org/111/testReport/
Release audit warnings: http://hudson.zones.apache.org/hudson/job/Pig-Patch-minerva.apache.org/111/artifact/trunk/patchprocess/releaseAuditDiffWarnings.txt
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Pig-Patch-minerva.apache.org/111/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Console output: http://hudson.zones.apache.org/hudson/job/Pig-Patch-minerva.apache.org/111/console

This message is automatically generated.

> PERFORMANCE: Support skewed join in pig
> ---------------------------------------
>
>                 Key: PIG-792
>                 URL: https://issues.apache.org/jira/browse/PIG-792
>             Project: Pig
>          Issue Type: Improvement
>            Reporter: Sriranjan Manjunath
>         Attachments: skewedjoin.patch
>
>
> Fragmented replicated join has a few limitations:
>  - One of the tables needs to be loaded into memory
>  - Join is limited to two tables
> Skewed join partitions the table and joins the records in the reduce phase. It computes
a histogram of the key space to account for skewing in the input records. Further, it adjusts
the number of reducers depending on the key distribution.
> We need to implement the skewed join in pig.

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