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From "Xuefu Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-10989) HoS can't control number of map tasks for runtime skew join [Spark Branch]
Date Sun, 02 Aug 2015 02:55:04 GMT

    [ https://issues.apache.org/jira/browse/HIVE-10989?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14650575#comment-14650575
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Xuefu Zhang commented on HIVE-10989:
------------------------------------

Merged to master and branch-1.

> HoS can't control number of map tasks for runtime skew join [Spark Branch]
> --------------------------------------------------------------------------
>
>                 Key: HIVE-10989
>                 URL: https://issues.apache.org/jira/browse/HIVE-10989
>             Project: Hive
>          Issue Type: Sub-task
>          Components: Spark
>            Reporter: Rui Li
>            Assignee: Rui Li
>             Fix For: spark-branch, 1.3.0, 2.0.0
>
>         Attachments: HIVE-10989.1-spark.patch
>
>
> Flags {{hive.skewjoin.mapjoin.map.tasks}} and {{hive.skewjoin.mapjoin.min.split}} are
used to control the number of map tasks for the map join of runtime skew join. They work well
for MR but have no effect for spark.
> This makes runtime skew join less useful, i.e. we just end up with slow mappers instead
of reducers.



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