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From "Rui Li (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-10458) Enable parallel order by for spark [Spark Branch]
Date Wed, 20 May 2015 07:16:59 GMT

    [ https://issues.apache.org/jira/browse/HIVE-10458?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14551929#comment-14551929
] 

Rui Li commented on HIVE-10458:
-------------------------------

For performance, as I said it depends on the query. I tested sorting a table with 112820001
records. Parallel orderby launches 189 reducers. And the result is 26s vs 484s compared with
single-reducer orderby.

> Enable parallel order by for spark [Spark Branch]
> -------------------------------------------------
>
>                 Key: HIVE-10458
>                 URL: https://issues.apache.org/jira/browse/HIVE-10458
>             Project: Hive
>          Issue Type: Sub-task
>          Components: Spark
>            Reporter: Rui Li
>            Assignee: Rui Li
>         Attachments: HIVE-10458.1-spark.patch, HIVE-10458.2-spark.patch, HIVE-10458.3-spark.patch
>
>
> We don't have to force reducer# to 1 as spark supports parallel sorting.



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