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From "Xuefu Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-13293) Query occurs performance degradation after enabling parallel order by for Hive on Spark
Date Tue, 17 May 2016 04:19:12 GMT

    [ https://issues.apache.org/jira/browse/HIVE-13293?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15286005#comment-15286005
] 

Xuefu Zhang commented on HIVE-13293:
------------------------------------

Please commit. Thanks.

> Query occurs performance degradation after enabling parallel order by for Hive on Spark
> ---------------------------------------------------------------------------------------
>
>                 Key: HIVE-13293
>                 URL: https://issues.apache.org/jira/browse/HIVE-13293
>             Project: Hive
>          Issue Type: Bug
>          Components: Spark
>    Affects Versions: 2.0.0
>            Reporter: Lifeng Wang
>            Assignee: Rui Li
>         Attachments: HIVE-13293.1.patch, HIVE-13293.2.patch, HIVE-13293.3.patch, HIVE-13293.3.patch,
HIVE-13293.3.patch
>
>
> I use TPCx-BB to do some performance test on Hive on Spark engine. And found query 10
has performance degradation when enabling parallel order by.
> It seems that sampling cost much time before running the real query.



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