Josh Elser commented on ACCUMULO-4177:

FYI for those following along ([~kturner]), I'm happy with Ben's current patch 
up on Reviewboard.

Speak up if you'd like some time to review/test before it's pushed. After the 
current patches I'm pushing through, I plan to pull Ben's down, do a little 
local test, and then push..

> TinyLFU-based BlockCache
> ------------------------
>                 Key: ACCUMULO-4177
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-4177
>             Project: Accumulo
>          Issue Type: Improvement
>    Affects Versions: 2.0.0
>            Reporter: Ben Manes
>             Fix For: 2.0.0
>         Attachments: ACCUMULO-4177.patch
> [LruBlockCache|https://github.com/apache/accumulo/blob/master/core/src/main/java/org/apache/accumulo/core/file/blockfile/cache/LruBlockCache.java]
>  appears to be based on HBase's. I currently have a patch being reviewed in 
> [HBASE-15560|https://issues.apache.org/jira/browse/HBASE-15560] that replaces 
> the pseudo Segmented LRU with the TinyLFU eviction policy. That should allow 
> the cache to make [better 
> predictions|https://github.com/ben-manes/caffeine/wiki/Efficiency] based on 
> frequency and recency, such as improved scan resistance. The implementation 
> uses [Caffeine|https://github.com/ben-manes/caffeine], the successor to 
> Guava's cache, to provide concurrency and keep the patch small.
> Full details are in the JIRA ticket. I think it should be easy to port if 
> there is interest.

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