Ben Manes commented on CASSANDRA-10855:

Thanks. Fixed by updating the build.xml and removing the old jar. That explodes 
the patch due to the jars checked into the repo. The linked PR mirrors it.

I'd also like to pair on evaluating TinyLFU for OHC, but would like to see this 
go in before we jump into that.

> Use Caffeine (W-TinyLFU) for on-heap caches
> -------------------------------------------
>                 Key: CASSANDRA-10855
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-10855
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Ben Manes
>              Labels: performance
>         Attachments: CASSANDRA-10855.patch, CASSANDRA-10855.patch
> Cassandra currently uses 
> [ConcurrentLinkedHashMap|https://code.google.com/p/concurrentlinkedhashmap] 
> for performance critical caches (key, counter) and Guava's cache for 
> non-critical (auth, metrics, security). All of these usages have been 
> replaced by [Caffeine|https://github.com/ben-manes/caffeine], written by the 
> author of the previously mentioned libraries.
> The primary incentive is to switch from LRU policy to W-TinyLFU, which 
> provides [near optimal|https://github.com/ben-manes/caffeine/wiki/Efficiency] 
> hit rates. It performs particularly well in database and search traces, is 
> scan resistant, and as adds a very small time/space overhead to LRU.
> Secondarily, Guava's caches never obtained similar 
> [performance|https://github.com/ben-manes/caffeine/wiki/Benchmarks] to CLHM 
> due to some optimizations not being ported over. This change results in 
> faster reads and not creating garbage as a side-effect.

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