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From "Szehon Ho (JIRA)" <>
Subject [jira] [Commented] (HIVE-7384) Research into reduce-side join [Spark Branch]
Date Fri, 22 Aug 2014 02:09:12 GMT


Szehon Ho commented on HIVE-7384:

Sorry Lianhui, I didnt see your reply before I typed the comment.  Please do let us know about
the Spark thoughts on auto-parallelism if you have any.

> Research into reduce-side join [Spark Branch]
> ---------------------------------------------
>                 Key: HIVE-7384
>                 URL:
>             Project: Hive
>          Issue Type: Sub-task
>          Components: Spark
>            Reporter: Xuefu Zhang
>            Assignee: Szehon Ho
>         Attachments: Hive on Spark Reduce Side Join.docx, sales_items.txt, sales_products.txt,
> Hive's join operator is very sophisticated, especially for reduce-side join. While we
expect that other types of join, such as map-side join and SMB map-side join, will work out
of the box with our design, there may be some complication in reduce-side join, which extensively
utilizes key tag and shuffle behavior. Our design principle prefers to making Hive implementation
work out of box also, which might requires new functionality from Spark. The tasks is to research
into this area, identifying requirements for Spark community and the work to be done on Hive
to make reduce-side join work.
> A design doc might be needed for this. For more information, please refer to the overall
design doc on wiki.

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