[jira] Updated: (PIG-792) Support skewed join in pig

["Ying He (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PIG-792?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ying He updated PIG-792:
------------------------

    Attachment: RandomSampleLoader.java

Add disk size of the tuple as the last field. This can be used to estimate how many tuples in the file.

> 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: RandomSampleLoader.java
>
>
> 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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