Erick Erickson created SOLR-8906:
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Summary: 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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