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From "Erick Erickson (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SOLR-8906) Make transient core cache pluggable.
Date Fri, 25 Mar 2016 19:39:25 GMT
Erick Erickson created SOLR-8906:
------------------------------------

             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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