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https://issues.apache.org/jira/browse/PIG-792?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12734878#action_12734878
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Sriranjan Manjunath commented on PIG-792:
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I have fixed the issue with a nullpointerexception when schema was specified as
part of load. It was a bug in rewire of LOJoin. The current patch is the latest
one and has no known issues.
> 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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