[
https://issues.apache.org/jira/browse/DRILL-3901?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14947078#comment-14947078
]
Aman Sinha commented on DRILL-3901:
-----------------------------------
[~mehant] could you pls review the minimal patch ? I believe you have a
broader patch but for 1.2 we should make the minimal change to resolve the
performance regression at least for the non-metadata-cache scenario.
> Performance regression with doing Explain of COUNT(*) over 100K files
> ---------------------------------------------------------------------
>
> Key: DRILL-3901
> URL: https://issues.apache.org/jira/browse/DRILL-3901
> Project: Apache Drill
> Issue Type: Bug
> Affects Versions: 1.1.0
> Reporter: Aman Sinha
> Assignee: Mehant Baid
> Attachments:
> 0001-DRILL-3901-Don-t-do-early-expansion-of-directory-in-.patch
>
>
> We are seeing a performance regression when doing an Explain of SELECT
> COUNT(*) over 100K files in a flat directory (no subdirectories) on latest
> master branch compared to a run that was done on Sept 26. Some initial
> details (I will have more later):
> {code}
> master branch on Sept 26
> No metadata cache: 71.452 secs
> With metadata cache: 15.804 secs
> Latest master branch
> No metadata cache: 110 secs
> With metadata cache: 32 secs
> {code}
> So, both cases show regression.
> [~mehant] and I took an initial look at this and it appears we might be doing
> the directory expansion twice.
>
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
