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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-4857) When no partition pruning occurs with metadata caching there's a performance regression
Date Tue, 23 Aug 2016 22:34:20 GMT

    [ https://issues.apache.org/jira/browse/DRILL-4857?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15433771#comment-15433771
] 

ASF GitHub Bot commented on DRILL-4857:
---------------------------------------

Github user jinfengni commented on the issue:

    https://github.com/apache/drill/pull/575
  
    +1 
    LGTM.



> When no partition pruning occurs with metadata caching there's a performance regression
> ---------------------------------------------------------------------------------------
>
>                 Key: DRILL-4857
>                 URL: https://issues.apache.org/jira/browse/DRILL-4857
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Metadata, Query Planning & Optimization
>    Affects Versions: 1.7.0
>            Reporter: Aman Sinha
>            Assignee: Aman Sinha
>             Fix For: 1.8.0
>
>
> After DRILL-4530, we see the (expected) performance improvements in planning time with
metadata cache for cases where partition pruning got applied.  However, in cases where it
did not get applied and for sufficiently large number of files (tested with up to 400K files),
 there's performance regression.  Part of this was addressed by DRILL-4846.   This JIRA is
to track some remaining fixes to address the regression.  



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