[jira] [Closed] (DRILL-4846) Eliminate extra operations during metadata cache pruning

["Dechang Gu (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/DRILL-4846?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Dechang Gu closed DRILL-4846.
-----------------------------

Verified, and added test cases to Perf Test Framework.
So close it.

> 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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