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From "Ying He (JIRA)" <j...@apache.org>
Subject [jira] Created: (PIG-1135) skewed join partitioner returns negative partition index
Date Wed, 09 Dec 2009 01:54:18 GMT
skewed join partitioner returns negative partition index 
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                 Key: PIG-1135
                 URL: https://issues.apache.org/jira/browse/PIG-1135
             Project: Pig
          Issue Type: Improvement
            Reporter: Ying He
            Assignee: 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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