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https://issues.apache.org/jira/browse/SOLR-15433?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Bruno Roustant updated SOLR-15433:
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    Fix Version/s: 8.10

> Replace basic LRU by Caffeine Cache for transient core cache
> ------------------------------------------------------------
>
>                 Key: SOLR-15433
>                 URL: https://issues.apache.org/jira/browse/SOLR-15433
>             Project: Solr
>          Issue Type: Improvement
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: Bruno Roustant
>            Priority: Major
>             Fix For: 8.10
>
>          Time Spent: 1h 50m
>  Remaining Estimate: 0h
>
> Currently TransientSolrCoreCacheDefault uses a basic LinkedList LRU cache to 
> store loaded transient cores. This can easily be replaced by the much more 
> effective Caffeine Cache.
> For example, with the current simple LRU when new cores are added, the least 
> recently accessed cores are evicted. So when a bunch of rarely used transient 
> cores are opened for punctual access (and added temporarily to the cache) 
> this causes the eviction of a bunch of regularly accessed cores. However this 
> case is nicely handled by the Caffeine Cache which keeps the regularly 
> accessed cores.



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