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https://issues.apache.org/jira/browse/SOLR-15555?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17417292#comment-17417292
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Ben Manes commented on SOLR-15555:
----------------------------------

If you perform recursive computations, then that must be performed outside of 
the map's atomic scope. The async version does that by staging the future in 
the map, calculating it on the caller, and populating the value. If you expect 
to have recursion then that probably the synchronous variant should be removed.

> Use filterCache.computeIfAbsent in SolrIndexSearcher
> ----------------------------------------------------
>
>                 Key: SOLR-15555
>                 URL: https://issues.apache.org/jira/browse/SOLR-15555
>             Project: Solr
>          Issue Type: Improvement
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: Mike Drob
>            Assignee: Mike Drob
>            Priority: Major
>             Fix For: main (9.0), 8.10
>
>         Attachments: OUTPUT-org.apache.solr.search.TestRangeQuery.txt.gz, 
> SOLR-15555.test-fix.patch
>
>          Time Spent: 5.5h
>  Remaining Estimate: 0h
>
> When multiple concurrent queries come in at the same time, in several cases 
> they can trigger concurrent computations of a DocSet for the cache. We should 
> investigate where this happens and possibly take care to only do a single 
> computation when possible.



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