[jira] [Updated] (HIVE-10989) HoS can't control number of map tasks for runtime skew join [Spark Branch]

["Rui Li (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-10989?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Rui Li updated HIVE-10989:
--------------------------
    Summary: HoS can't control number of map tasks for runtime skew join [Spark Branch]  (was: Spark can't control number of map tasks for runtime skew join [Spark Branch])

> 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
>
> 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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