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From "Josh Elser (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-4177) TinyLFU-based BlockCache
Date Mon, 04 Apr 2016 14:48:25 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-4177?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15224278#comment-15224278
] 

Josh Elser commented on ACCUMULO-4177:
--------------------------------------

bq. Or, we could switch the implementation at runtime depending on the version of the runtime
engine.

If we could switch the build to JDK8 required but still support a jdk7 runtime, that would
certainly be an ideal scenario (at least a scenario that requires the least amount of user
effort)

> TinyLFU-based BlockCache
> ------------------------
>
>                 Key: ACCUMULO-4177
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-4177
>             Project: Accumulo
>          Issue Type: Improvement
>            Reporter: Ben Manes
>
> [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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