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https://issues.apache.org/jira/browse/PIG-792?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12729028#action_12729028
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Hadoop QA commented on PIG-792:
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-1 overall. Here are the results of testing the latest attachment
http://issues.apache.org/jira/secure/attachment/12412944/skewedjoin.patch
against trunk revision 792368.
+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 did not generate any warning messages.
+1 javac. The applied patch does not increase the total number of javac
compiler warnings.
-1 findbugs. The patch appears to introduce 1 new Findbugs warnings.
+1 release audit. The applied patch does not increase the total number of
release audit 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/116/testReport/
Findbugs warnings:
http://hudson.zones.apache.org/hudson/job/Pig-Patch-minerva.apache.org/116/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Console output:
http://hudson.zones.apache.org/hudson/job/Pig-Patch-minerva.apache.org/116/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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