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From "Xuefu Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-17976) HoS: don't set output collector if there's no data to process
Date Mon, 13 Nov 2017 15:42:00 GMT

    [ https://issues.apache.org/jira/browse/HIVE-17976?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16249734#comment-16249734
] 

Xuefu Zhang commented on HIVE-17976:
------------------------------------

Sounds good. Thanks for the explanation, [~lirui].

> HoS: don't set output collector if there's no data to process
> -------------------------------------------------------------
>
>                 Key: HIVE-17976
>                 URL: https://issues.apache.org/jira/browse/HIVE-17976
>             Project: Hive
>          Issue Type: Bug
>          Components: Spark
>            Reporter: Rui Li
>            Assignee: Rui Li
>            Priority: Minor
>         Attachments: HIVE-17976.1.patch, HIVE-17976.2.patch
>
>
> MR doesn't set an output collector if no row is processed, i.e. {{ExecMapper::map}} is
never called. Let's investigate whether Spark should do the same.



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