Ying He commented on PIG-954:

the sampling job fails when pig.skewedjoin.reduce.memusage is not configured in 
pig property file. 

> Skewed join fails when pig.skewedjoin.reduce.memusage is not configured
> -----------------------------------------------------------------------
>                 Key: PIG-954
>                 URL: https://issues.apache.org/jira/browse/PIG-954
>             Project: Pig
>          Issue Type: Improvement
>            Reporter: Ying He
> 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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