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