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https://issues.apache.org/jira/browse/SOLR-2889?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13148269#comment-13148269
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Jason Rutherglen commented on SOLR-2889:
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Simon and Yonik, re-read what you wrote, have fun.
> 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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