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https://issues.apache.org/jira/browse/SOLR-3393?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13541157#comment-13541157
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Shawn Heisey commented on SOLR-3393:
------------------------------------
N.B.: subversion appears to have gotten the 'patch' subcommand in version 1.7 -
CentOS 6 has v1.6. I always find that Redhat's stable offerings are quite
outdated.
> Implement an optimized LFUCache
> -------------------------------
>
> Key: SOLR-3393
> URL: https://issues.apache.org/jira/browse/SOLR-3393
> Project: Solr
> Issue Type: Improvement
> Components: search
> Affects Versions: 3.6, 4.0-ALPHA
> Reporter: Shawn Heisey
> Assignee: Hoss Man
> Priority: Minor
> Fix For: 4.1
>
> Attachments: SOLR-3393-4x-withdecay.patch, SOLR-3393.patch,
> SOLR-3393.patch, SOLR-3393.patch, SOLR-3393.patch, SOLR-3393.patch,
> SOLR-3393.patch, SOLR-3393.patch, SOLR-3393-trunk-withdecay.patch
>
>
> SOLR-2906 gave us an inefficient LFU cache modeled on
> FastLRUCache/ConcurrentLRUCache. It could use some serious improvement. The
> following project includes an Apache 2.0 licensed O(1) implementation. The
> second link is the paper (PDF warning) it was based on:
> https://github.com/chirino/hawtdb
> http://dhruvbird.com/lfu.pdf
> Using this project and paper, I will attempt to make a new O(1) cache called
> FastLFUCache that is modeled on LRUCache.java. This will (for now) leave the
> existing LFUCache/ConcurrentLFUCache implementation in place.
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