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https://issues.apache.org/jira/browse/SOLR-2906?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13153080#comment-13153080
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Shawn Heisey commented on SOLR-2906:
------------------------------------
Evictions definitely don't seem to be working right. I finally got a benchmark
script going. I watched as the size of the filterCache climbed to the maximum
size of 64. On the next insert, it was suddenly only 7 entries, and the
eviction counter had incremented from 290 to 348. That seems really
aggressive. I seem to have done something wrong.
Once I got through with the benchmark script, I did a commit, at that moment
the size was 50 out of 64. After warming (autowarmCount 16), the cache size
was 12, and both the hits and lookups were -12 (negative).
> 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, FastLFUCache.java
>
>
> Implement an LFU (Least Frequently Used) cache as the first step towards a
> full ARC cache
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