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Posted to dev@pig.apache.org by "Sriranjan Manjunath (JIRA)" <ji...@apache.org> on 2009/05/08 00:34:45 UTC
[jira] Commented: (PIG-792) Support skewed join in pig
[ https://issues.apache.org/jira/browse/PIG-792?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12707163#action_12707163 ]
Sriranjan Manjunath commented on PIG-792:
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More on the design here: http://wiki.apache.org/pig/PigSkewedJoinSpec
> 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
>
> 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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