Thanks for the input, Sean.
Playing devil's advocate: we didn't have a major version bump when we
dropped JDK6 support (in Accumulo-1.7.0). Oracle has EOL'ed java 7 back
in April 2015. Was the 6->7 upgrade different than a 7->8 upgrade?
Sean Busbey wrote:
If we drop jdk7 support, I would strongly prefer a major version bump.
On Sun, May 1, 2016 at 1:43 PM, Josh Elser<[email protected]> wrote:
Folks --
Let's come up with a plan for Java 8 support. Do we bump minJdk for
accumulo-1.8.0 to 8? Should we fork a branch for 1.8 and make master
2.0.0-SNAPSHOT (and do the bump there)?
Other approaches?
- Josh
-------- Original Message --------
Subject: [jira] [Commented] (ACCUMULO-4177) TinyLFU-based BlockCache
Date: Sat, 30 Apr 2016 01:06:12 +0000 (UTC)
From: Ben Manes (JIRA)<[email protected]>
Reply-To: [email protected]
To: [email protected]
[
https://issues.apache.org/jira/browse/ACCUMULO-4177?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15265032#comment-15265032
]
Ben Manes commented on ACCUMULO-4177:
-------------------------------------
I can put something together when Accumulo is ready to accept Java 8
patches. Let me know.
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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