Sriranjan Manjunath updated PIG-792:

    Attachment: skewedjoin.patch

Creating a single patch for skewed join.

> 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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