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https://issues.apache.org/jira/browse/SOLR-17665?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17926201#comment-17926201
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Luke Kot-Zaniewski commented on SOLR-17665:
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+1 to the inheritance problem [~dsmiley] .. I just missed your update as I was
typing the above... I also found that directly extending IndexSearcher to be
inflexible here, i.e. need to create two SolrIndexSearchers to fully bifurcate
multithreadedness just to appease this self-imposed contract.
> Perf regression: overhead of multiThreaded=false should be nothing
> ------------------------------------------------------------------
>
> Key: SOLR-17665
> URL: https://issues.apache.org/jira/browse/SOLR-17665
> Project: Solr
> Issue Type: Bug
> Components: search
> Affects Versions: 9.7
> Reporter: David Smiley
> Priority: Major
> Attachments: flight-9.8-executor-disabled.jfr,
> flight-9.8-mt-false-executor-enabled.jfr, flight-9.8-mt-true.jfr
>
>
> SOLR-13350 introduced {{multiThreaded}} query param, defaulting to false,
> thus opt-in. But there is still a serious performance impact; only setting
> {{indexSearcherExecutorThreads}} to -1 in solr.xml mitigates the regression.
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