janhoy commented on code in PR #4236:
URL: https://github.com/apache/solr/pull/4236#discussion_r3089989566


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solr/solr-ref-guide/modules/deployment-guide/pages/solrcloud-distributed-requests.adoc:
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Review Comment:
   I want to keep the scope of this **bugfix** PR low and not re-architect the 
whole async solution. Feel free to launch a followup JIRA to either upper the 
default value (after careful benchmarking) or re-architect the entire async 
solution, perhaps with java virtual threads and no CompletableFuture at all. 
   
   I suspect there is a case this semaphote as a push-back mechanism to prevent 
overload of the solr nodes. Say you have an insane amount of incoming 
distributed requests to the cluster and no circuit-breakers in place. I can 
imagine nodes falling over with OOM or other symptoms if the semaphore is 
removed or dramatically increased. Perhaps Fullstory or others who have 
modified this setting in their fork can provide some insights?



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