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https://issues.apache.org/jira/browse/SOLR-8906?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15222638#comment-15222638
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Ben Manes commented on SOLR-8906:
---------------------------------
Not sure if it helps, but there's discussion of using TinyLFU instead of LRU /
LFU for the SolrCache
([SOLR-8241|https://issues.apache.org/jira/browse/SOLR-8241]). That library
could be used instead of LRU here too to evict based on recency and frequency.
From my reading of
[transientCores|https://github.com/apache/lucene-solr/blob/master/solr/core/src/java/org/apache/solr/core/SolrCores.java#L76]
that appears to be a simple migration.
> Make transient core cache pluggable.
> ------------------------------------
>
> Key: SOLR-8906
> URL: https://issues.apache.org/jira/browse/SOLR-8906
> Project: Solr
> Issue Type: Improvement
> Reporter: Erick Erickson
> Assignee: Erick Erickson
>
> The current Lazy Core stuff is pretty deeply intertwined in CoreContainer.
> Adding and removing active cores is based on a simple LRU mechanism, but
> keeping the right cores in the right internal structures involves a lot of
> attention to locking various objects to update internal structures. This
> makes it difficult/dangerous to use any other caching algorithms.
> Any single age-out algorithm will have non-optimal access patterns, so making
> this pluggable would allow better algorithms to be substituted in those cases.
> If we ever extend transient cores to SolrCloud, we need to have load/unload
> decisions that are cloud-aware rather then entirely local so in that sense
> this is would lay some groundwork if we ever want to go there.
> So I'm going to try to hack together a PoC. Any ideas on the most sensible
> pattern for this gratefully received.
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