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https://issues.apache.org/jira/browse/SOLR-2906?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13155258#comment-13155258
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Shawn Heisey commented on SOLR-2906:
------------------------------------

Something odd happens with the filterCache.  When things are first starting 
off, the cache size and the number of inserts don't match up.  It's usually off 
by 10, with more in the inserts.  This doesn't seem to happen with the other 
cache types, also using LFU.
                
> Implement LFU Cache
> -------------------
>
>                 Key: SOLR-2906
>                 URL: https://issues.apache.org/jira/browse/SOLR-2906
>             Project: Solr
>          Issue Type: Sub-task
>          Components: search
>    Affects Versions: 3.4
>            Reporter: Shawn Heisey
>            Priority: Minor
>         Attachments: ConcurrentLFUCache.java, LFUCache.java, SOLR-2906.patch, 
> TestLFUCache.java
>
>
> Implement an LFU (Least Frequently Used) cache as the first step towards a 
> full ARC cache

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