Pierre Salagnac created SOLR-17144:
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Summary: 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: 9.4, 8.11
Reporter: Pierre Salagnac
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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