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https://issues.apache.org/jira/browse/SOLR-8906?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16814692#comment-16814692
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Uwe Schindler commented on SOLR-8906:
-------------------------------------
The Observable stuff is deprecated in Java 11, so we stumbled on this issue in
LUCENE-8738. Can you check if the changes in LUCENE-8738 are fine?
> 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
> Priority: Major
> Fix For: 6.6, 7.0
>
> Attachments: SOLR-8906.patch, SOLR-8906.patch, SOLR-8906.patch,
> SOLR-8906.patch, SOLR-8906.patch
>
>
> 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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