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https://issues.apache.org/jira/browse/SOLR-3393?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13259301#comment-13259301
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Shawn Heisey commented on SOLR-3393:
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After all the bugs are worked out of the implementation covered by this issue,
I can see a future scenario where the existing (slow) LFUCache is scrapped,
FastLFUCache is renamed LFUCache, and a new FastLFUCache implementation that
uses a Concurrent class is created. If the committers would prefer that I go
ahead and scrap LFUCache now and just use that name, let me know.
I have no plans to work on SOLR-2889, so it may be best to just close that
issue. I don't know if SOLR-2906 should be changed from a subtask to a full
task.
> 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
> Reporter: Shawn Heisey
> Priority: Minor
> Fix For: 4.0
>
>
> 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 FastLFUCache/ConcurrentLFUCache implementation in place.
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