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https://issues.apache.org/jira/browse/SOLR-2906?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13155280#comment-13155280
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Shawn Heisey commented on SOLR-2906:
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The only static warming I have is a *:* search with a sort parameter (and no
filter query), which precaches my sort. I do have autowarming configured, but
this behavior happens from initial solr startup. Things seem to behave
correctly with warming - size is autowarmCount, inserts are zero.
FastLRUCache behavior:
queryResultCache: size is one higher than inserts
documentCache: size is one higher than inserts
filterCache: size and inserts are identical
LFUCache behavior:
queryResultCache: size is one higher than inserts
documentCache: size is one higher than inserts
filterCache: inserts is higher than size by a variable amount
I've seen 10 (on two different runs) and 2 (on the most recent run) as the
difference between inserts and size.
The FastLRUCache behavior is seen on my production servers with production
queries, the LFUCache behavior is on my test server with a benchmark script
providing the queries. I suppose there might be something weird about my
canned queries that makes the filterCache behave differently, but the original
source of the queries was a production Solr log at level INFO.
> 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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