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https://issues.apache.org/jira/browse/SOLR-14639?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17154652#comment-17154652
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Ishan Chattopadhyaya commented on SOLR-14639:
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I have a client who is experiencing very similar symptoms with Collapse
QParser. Higher latency during high concurrency, but no significant CPU load
increase.
> Improve concurrency of SlowCompositeReaderWrapper.terms
> -------------------------------------------------------
>
> Key: SOLR-14639
> URL: https://issues.apache.org/jira/browse/SOLR-14639
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Components: search
> Affects Versions: 8.4.1
> Reporter: Shalin Shekhar Mangar
> Priority: Major
> Attachments: Screen Shot 2020-07-09 at 4.38.03 PM.png
>
>
> Under heavy query load, the ConcurrentHashMap.computeIfAbsent method inside
> the SlowCompositeReaderWrapper.terms(String) method blocks searcher threads
> (see attached screenshot of a java flight recording).
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