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From "Shawn Heisey (JIRA)" <j...@apache.org>
Subject [jira] [Issue Comment Edited] (SOLR-3393) Implement an optimized LFUCache
Date Fri, 27 Apr 2012 07:46:56 GMT

    [ https://issues.apache.org/jira/browse/SOLR-3393?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13263445#comment-13263445
] 

Shawn Heisey edited comment on SOLR-3393 at 4/27/12 7:45 AM:
-------------------------------------------------------------

Is this too big a change to be included in 3.6.1?  I will likely be trying this out with 3.6,
once I clear my plate a little bit.  Possibly futile justification: It's a bug fix!  The bug
it fixes is "poor performance." ;)
                
      was (Author: elyograg):
    Is this too big a change to be included in 3.6.1?  I will likely be trying this out with
3.6, once I clear my plate a little bit.
                  
> 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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