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https://issues.apache.org/jira/browse/ACCUMULO-4177?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15224292#comment-15224292
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Dave Marion commented on ACCUMULO-4177:
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There is currently 1 blocker[1] open in the Hadoop Java 8 umbrella ticket.
Additionally, it appears that Hadoop is changing their minimum version in
Hadoop 3.0[2]. While Accumulo works with Java 8, it doesn't mean that all of
our users dependencies do as well. I suggest changing the minimum Java version
in Accumulo version 2.0 and putting in the ability to change the implementation
in cases where users are running Accumulo 1.x and Java 8.
[1] https://issues.apache.org/jira/browse/YARN-4714
[2] https://issues.apache.org/jira/browse/HADOOP-11858
> 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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