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https://issues.apache.org/jira/browse/SOLR-3393?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13260828#comment-13260828
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Shawn Heisey edited comment on SOLR-3393 at 4/24/12 6:59 PM:
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New patch that does not touch SolrInfoMBeanTest. I figured out what
FastLRUCache does to avoid failing this test and did the same. The
getStatistics method now immediately returns an empty NamedList if the cache
has not been initialized. This could be done for LRUCache as well.
was (Author: elyograg):
New patch that does not touch SolrInfoMBeanTest. I figured out what
FastLRUCache does to avoid failing this test and did the same. The
getStatistics method now immediately returns null if the cache has not been
initialized. This could be done for LRUCache as well.
> 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-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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