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From "Lefty Leverenz (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-12329) Turn on limit pushdown optimization by default
Date Wed, 04 Nov 2015 05:48:27 GMT

    [ https://issues.apache.org/jira/browse/HIVE-12329?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14988940#comment-14988940
] 

Lefty Leverenz commented on HIVE-12329:
---------------------------------------

While you're at it, could you please change the description of *hive.limit.pushdown.memory.usage*
to indicate the units?  (Since the new default is 0.1f, I'm guessing it's a fraction of ...
um ... total memory or some subset?)

Current description:  "The max memory to be used for hash in RS operator for top K selection."

It might be good to explain what RS means, too.

> Turn on limit pushdown optimization by default
> ----------------------------------------------
>
>                 Key: HIVE-12329
>                 URL: https://issues.apache.org/jira/browse/HIVE-12329
>             Project: Hive
>          Issue Type: Improvement
>          Components: Configuration
>            Reporter: Ashutosh Chauhan
>            Assignee: Ashutosh Chauhan
>         Attachments: HIVE-12329.patch
>
>
> Whenever applicable, this will always help, so this should be on by default.



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