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Date: Wed, 17 Dec 2014 04:48:15 +0000 (UTC)
From: "Rui Li (JIRA)" <jira@apache.org>
To: hive-dev@hadoop.apache.org
Message-ID: <JIRA.12761670.1418608508000.40875.1418791695407@Atlassian.JIRA>
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 <JIRA.12761670.1418608508683@arcas>
Subject: [jira] [Commented] (HIVE-9097) Support runtime skew join for more
 queries [Spark Branch]
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    [ https://issues.apache.org/jira/browse/HIVE-9097?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14249463#comment-14249463 ] 

Rui Li commented on HIVE-9097:
------------------------------

Thanks [~xuefuz] for the review.

> Support runtime skew join for more queries [Spark Branch]
> ---------------------------------------------------------
>
>                 Key: HIVE-9097
>                 URL: https://issues.apache.org/jira/browse/HIVE-9097
>             Project: Hive
>          Issue Type: Improvement
>          Components: Spark
>    Affects Versions: spark-branch
>            Reporter: Rui Li
>            Assignee: Rui Li
>             Fix For: spark-branch
>
>         Attachments: HIVE-9097.1-spark.patch
>
>
> After HIVE-8913, runtime skew join is enabled for spark. But currently the optimization only supports the simplest case where join is the leaf ReduceWork in a work graph. This is because the results from the original join and the conditional map join have to be unioned to feed to downstream works, which can be a little tricky for spark.
> This JIRA is to research and find a way to relax the above restriction. A possible solution is to break the original task into two tasks on the join work, and insert the conditional task in between.


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