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https://issues.apache.org/jira/browse/SOLR-15555?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17421613#comment-17421613
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Mark Robert Miller commented on SOLR-15555:
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{quote}I wasn't thinking about all the Join queries initially, and will leave 
sync option as an expert opt-in for now,
{quote}
It kind of seems like it's more does not work than an expert option. It's 
pretty rough to say here is another way to configure the cache, but avoid join 
queries, avoid child docs, hopefully that's it...?

> 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: 5h 40m
>  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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