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https://issues.apache.org/jira/browse/SOLR-17841?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18036641#comment-18036641
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David Smiley commented on SOLR-17841:
-------------------------------------

This doesn't seem like a release blocker; it's an opt-in feature.

> Investigate multithreaded search performance bottlenecks
> --------------------------------------------------------
>
>                 Key: SOLR-17841
>                 URL: https://issues.apache.org/jira/browse/SOLR-17841
>             Project: Solr
>          Issue Type: Improvement
>            Reporter: Ishan Chattopadhyaya
>            Priority: Blocker
>             Fix For: 10.0
>
>
> Ever since multithreaded search (SOLR-13350) was introduced, there has been 
> not much effort to benchmark the performance benefit or investigate the 
> performance bottlenecks. Anecdotally, it is not faster than single threaded 
> execution.
> Thanks to [~kevinliang01] [~liangkaiwen] [~liangkw16] and [~dsmiley] for 
> bringing this up, yesterday on a dense vector working group meeting.
> I'm marking this as a release 10.0 blocker, because it is embarrassing to be 
> releasing with such a gaping hole.



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