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From "Shawn Heisey (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (SOLR-3393) Implement an optimized LFUCache
Date Wed, 25 Apr 2012 14:20:17 GMT

     [ https://issues.apache.org/jira/browse/SOLR-3393?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Shawn Heisey updated SOLR-3393:
-------------------------------

    Attachment: SOLR-3393.patch

Patch with separate options for evictDecay and warmDecay.  The timeDecay option sets the other
two options to true, for compatibility with 3.6.0.  The tests aren't yet updated, so one of
them fails.  I need to change the tests so they verify operation of both the new options.
                
> 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-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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