[jira] [Updated] (SOLR-8906) Make transient core cache pluggable.

["Erick Erickson (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SOLR-8906?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Erick Erickson updated SOLR-8906:
---------------------------------
    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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