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Posted to dev@lucene.apache.org by "Ben Manes (JIRA)" <ji...@apache.org> on 2016/04/02 03:52:25 UTC
[jira] [Commented] (SOLR-8906) Make transient core cache pluggable.
[ https://issues.apache.org/jira/browse/SOLR-8906?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15222638#comment-15222638 ]
Ben Manes commented on SOLR-8906:
---------------------------------
Not sure if it helps, but there's discussion of using TinyLFU instead of LRU / LFU for the SolrCache ([SOLR-8241|https://issues.apache.org/jira/browse/SOLR-8241]). That library could be used instead of LRU here too to evict based on recency and frequency. From my reading of [transientCores|https://github.com/apache/lucene-solr/blob/master/solr/core/src/java/org/apache/solr/core/SolrCores.java#L76] that appears to be a simple migration.
> 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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