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https://issues.apache.org/jira/browse/SOLR-17144?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Smiley resolved SOLR-17144.
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Fix Version/s: 9.6.0
Resolution: Fixed
Thanks Pierre!
> Each unused core has a dormant but active thread
> ------------------------------------------------
>
> Key: SOLR-17144
> URL: https://issues.apache.org/jira/browse/SOLR-17144
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Affects Versions: 8.11, 9.4
> Reporter: Pierre Salagnac
> Priority: Major
> Labels: Performance
> Fix For: 9.6.0
>
> Time Spent: 40m
> Remaining Estimate: 0h
>
> Each Core in SolrCloud spawns a thread to warmup and open new searchers when
> needed.
> In case the Core is inactive for a while, this thread uses some resources for
> no good reason, and may have performance impact when we reach a very high
> number of cores per Solr node.
>
> Simple fix is to spawn this thread on-demande with a short TTL to save some
> memory.
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