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https://issues.apache.org/jira/browse/SOLR-15555?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17421648#comment-17421648
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David Smiley commented on SOLR-15555:
-------------------------------------
While of course we wouldn't advise join queries or child docs when they are not
needed, but of course sometimes they are. We shouldn't tell users to avoid
these important Solr features.
> 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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