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https://issues.apache.org/jira/browse/SOLR-3393?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shawn Heisey updated SOLR-3393:
-------------------------------
Attachment: SOLR-3393.patch
Updated patch. Tests pass and should cover all current functionality. It
defaults to a keepPercentage of 80. I'm not sure I like 'keepPercentage' as an
option name, feel free to bikeshed over that and all the defaults I have chosen.
It might be ready to commit now, if nobody finds fault with it.
> 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
>
> Attachments: SOLR-3393.patch, SOLR-3393.patch, SOLR-3393.patch,
> SOLR-3393.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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