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https://issues.apache.org/jira/browse/PIG-955?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12754349#action_12754349
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Santhosh Srinivasan commented on PIG-955:
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Hi Ying,
How are Fragment Replicate Join and Skewed Join related as you mention in your
bug description? Also, skewed join has been part of trunk for more than a month
now. Your bug description states that Pig needs skewed join.
Thanks,
Santhosh
> Skewed join generates incorrect results
> -----------------------------------------
>
> Key: PIG-955
> URL: https://issues.apache.org/jira/browse/PIG-955
> Project: Pig
> Issue Type: Improvement
> Reporter: Ying He
> Attachments: PIG-955.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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