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Posted to issues@solr.apache.org by "Bruno Roustant (Jira)" <ji...@apache.org> on 2021/06/02 08:23:00 UTC

[jira] [Commented] (SOLR-15433) Replace basic LRU by Caffeine Cache for transient core cache

    [ https://issues.apache.org/jira/browse/SOLR-15433?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17355564#comment-17355564 ] 

Bruno Roustant commented on SOLR-15433:
---------------------------------------

I'm going to merge it in two days.

> 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
>          Time Spent: 1h 10m
>  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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