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From "Aman Sinha (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-4846) Eliminate extra operations during metadata cache pruning
Date Tue, 16 Aug 2016 02:03:20 GMT

    [ https://issues.apache.org/jira/browse/DRILL-4846?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15422042#comment-15422042
] 

Aman Sinha commented on DRILL-4846:
-----------------------------------

I have created a PR for the items identified in the description.  More performance analysis
is ongoing. 

> Eliminate extra operations during metadata cache pruning
> --------------------------------------------------------
>
>                 Key: DRILL-4846
>                 URL: https://issues.apache.org/jira/browse/DRILL-4846
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Metadata
>    Affects Versions: 1.7.0
>            Reporter: Aman Sinha
>            Assignee: Aman Sinha
>             Fix For: 1.8.0
>
>
> While doing performance testing for DRILL-4530 using a new data set and queries, we found
two potential performance issues: (a) the metadata cache was being read twice in some cases
and (b) the checking for directory modification time was being done twice, once as part of
the first phase of directory-based pruning and subsequently after the second phase pruning.
  This check gets expensive for large number of directories.   Creating this JIRA to track
fixes for these issues. 



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