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From "Gopal V (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-20048) Consider enabling hive.fetch.task.aggr by default
Date Mon, 02 Jul 2018 05:45:00 GMT

    [ https://issues.apache.org/jira/browse/HIVE-20048?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16529407#comment-16529407
] 

Gopal V commented on HIVE-20048:
--------------------------------

-1 on this, because local tasks aren't vectorized (& HS2 has to do more work, which limits
concurrency).

This would actually slow down queries in everything other than MRv2 (where we spin up a 2nd
job to do the aggr task, which is what this bypasses).

> Consider enabling hive.fetch.task.aggr by default
> -------------------------------------------------
>
>                 Key: HIVE-20048
>                 URL: https://issues.apache.org/jira/browse/HIVE-20048
>             Project: Hive
>          Issue Type: Task
>          Components: Physical Optimizer
>            Reporter: Ashutosh Chauhan
>            Priority: Major
>
> This optimization is in code base for long time. We shall consider enabling it by default.



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