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From "Ben Manes (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (ACCUMULO-4177) TinyLFU-based BlockCache
Date Thu, 15 Sep 2016 20:28:22 GMT

     [ https://issues.apache.org/jira/browse/ACCUMULO-4177?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ben Manes updated ACCUMULO-4177:
--------------------------------
    Affects Version/s: 2.0.0
               Status: Patch Available  (was: Open)

> 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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