[SOLR-17144] Each unused core has a dormant but active thread

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 8.11, 9.4
• Fix Version/s: 9.6
• Labels: Performance
• Assignee: Unassigned
• Reporter: Pierre Salagnac
• Created: 31/Jan/24 19:02
• Updated: 28/Apr/24 19:22
• Resolved: 04/Feb/24 00:27

Description

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.

Issue Links

• links to: GitHub Pull Request #2236