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From "Erick Erickson (JIRA)" <>
Subject [jira] [Commented] (SOLR-8906) Make transient core cache pluggable.
Date Wed, 10 Apr 2019 18:49:00 GMT


Erick Erickson commented on SOLR-8906:

Yeah, saw that just now. Commented on LUCENE-8738, but it looks good to me.


And a big thanks for everyone's work on moving to Java 11....

> Make transient core cache pluggable.
> ------------------------------------
>                 Key: SOLR-8906
>                 URL:
>             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,
> 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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