hive-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
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, 12 Apr 2016 15:56:25 GMT

    [ https://issues.apache.org/jira/browse/HIVE-13293?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15237434#comment-15237434
] 

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

[~lirui], thanks for the investigation and the patch, which seems simple and straightforward.
One question: what do you mean by "only works queries that have only one ShuffleMapStage"?
In your previous example, there are actually a few such stages. Isn't your patch supposed
to help that as well?

> 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
>
>
> 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.



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

Mime
View raw message