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https://issues.apache.org/jira/browse/LUCENE-8808?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16845828#comment-16845828
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Adrien Grand commented on LUCENE-8808:
--------------------------------------

I don't think it really fixes the problem, it only makes it occur a bit later? 
If there is a single bad query, it makes the issue less problematic for the 
well-behaved queries, but what if 10% of your queries are bad, then these 
queries would likely still hog all available threads (and probably even fill 
the queue) and none of the well-behaved queries may run?

> Introduce Optional Cap on Number Of Threads Per Query
> -----------------------------------------------------
>
>                 Key: LUCENE-8808
>                 URL: https://issues.apache.org/jira/browse/LUCENE-8808
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: core/search
>            Reporter: Atri Sharma
>            Priority: Major
>
> With the presence of https://issues.apache.org/jira/browse/LUCENE-8757 , a 
> natural progression is to allow advanced users to specify a cap on the number 
> of threads a query can use. This is especially useful for long polled 
> IndexSearcher instances, where the same instance is used to fire queries for 
> multiple runs and there are multiple concurrent IndexSearcher instances on 
> the same node.
>  
> This will be an optional parameter and local only to the IndexSearcher 
> instance being configured during construction.



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