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https://issues.apache.org/jira/browse/LUCENE-10067?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17404428#comment-17404428
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Michael McCandless commented on LUCENE-10067:
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{quote}It's a good thing they were running every night, otherwise these two
could easily have canceled out!
{quote}
Yikes, you're right!
Scary because there are many nights where benchmarks are broken and it takes me
time to notice ... so now I wonder if we have any such silent "cancelled each
other out" events in the past!
> investigate 6/23/2021 -> 6/24/2021 drop in facets perf
> ------------------------------------------------------
>
> Key: LUCENE-10067
> URL: https://issues.apache.org/jira/browse/LUCENE-10067
> Project: Lucene - Core
> Issue Type: Task
> Reporter: Robert Muir
> Priority: Major
>
> Just looking at perf graph (and recent gains from LUCENE-5309), it is unclear
> why performance dropped on that date, and if we paved new, better
> performance, or instead just regained some lost-ground only in the single
> value case?
> Example:
> https://home.apache.org/~mikemccand/lucenebench/BrowseDayOfYearSSDVFacets.html
> after some debugging, it looks like LUCENE-9613 change may be responsible. It
> was the only relevant change between the 6/23 and 6/24 benchmarks.
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