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https://issues.apache.org/jira/browse/SOLR-2889?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13149236#comment-13149236
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Shawn Heisey commented on SOLR-2889:
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bq. ConcurrentLRUCache has been moved out of SolrJ and into Solr Core in trunk
and 3x in SOLR-2758. Which source code checkout are you looking at?
I'm looking at 3.4.0, the version I'm running.
> Implement Adaptive Replacement Cache
> ------------------------------------
>
> Key: SOLR-2889
> URL: https://issues.apache.org/jira/browse/SOLR-2889
> Project: Solr
> Issue Type: New Feature
> Components: search
> Affects Versions: 3.4
> Reporter: Shawn Heisey
> Priority: Minor
>
> Currently Solr's caches are LRU, which doesn't look at hitcount to decide
> which entries are most important. There is a method that takes both
> frequency and time of cache hits into account:
> http://en.wikipedia.org/wiki/Adaptive_Replacement_Cache
> If it's feasible, this could be a good addition to Solr/Lucene.
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