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From "Rui Li (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-10989) HoS can't control number of map tasks for runtime skew join [Spark Branch]
Date Mon, 15 Jun 2015 04:42:00 GMT

    [ https://issues.apache.org/jira/browse/HIVE-10989?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14585418#comment-14585418
] 

Rui Li commented on HIVE-10989:
-------------------------------

Failed tests are not related.

> 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
>         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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