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https://issues.apache.org/jira/browse/SOLR-8906?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Erick Erickson updated SOLR-8906:
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Attachment: SOLR-8906.patch
Here's a patch that moves all the transient core processing to a plugin. If
nothing else, changing the code to this model will move us toward a place where
we can isolate the core handling to a plugin...
I won't commit this for a while, certainly not until after 6.5 is cut. Between
now and then we can debate.
> 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
> Attachments: 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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