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From "Adrien Grand (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (SOLR-3393) Implement an optimized LFUCache
Date Thu, 06 Sep 2012 18:05:08 GMT

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

Adrien Grand updated SOLR-3393:
-------------------------------

    Attachment: SOLR-3393.patch

Chris, I tried to rework your patch in order to remove the decay options, make maxFreq configurable
(with 10 as a default value) and share the statistics code with LRUCache (by adding a common
MapCacheBase superclass).

What do you think?
                
> 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
>            Priority: Minor
>             Fix For: 4.0
>
>         Attachments: 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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