[jira] [Commented] (SOLR-3393) Implement an optimized LFUCache

["Shawn Heisey (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-3393?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14248265#comment-14248265 ] 

Shawn Heisey commented on SOLR-3393:
------------------------------------

I really need to finish this and see if I can get it into 5.0.

> 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: Shawn Heisey
>            Priority: Minor
>             Fix For: 4.9, Trunk
>
>         Attachments: SOLR-3393-4x-withdecay.patch, SOLR-3393-trunk-withdecay.patch, SOLR-3393.patch, SOLR-3393.patch, SOLR-3393.patch, 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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