Return-Path: X-Original-To: apmail-accumulo-notifications-archive@minotaur.apache.org Delivered-To: apmail-accumulo-notifications-archive@minotaur.apache.org Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by minotaur.apache.org (Postfix) with SMTP id 80495193D9 for ; Mon, 4 Apr 2016 14:42:26 +0000 (UTC) Received: (qmail 74270 invoked by uid 500); 4 Apr 2016 14:42:26 -0000 Delivered-To: apmail-accumulo-notifications-archive@accumulo.apache.org Received: (qmail 74085 invoked by uid 500); 4 Apr 2016 14:42:26 -0000 Mailing-List: contact notifications-help@accumulo.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: jira@apache.org Delivered-To: mailing list notifications@accumulo.apache.org Received: (qmail 73972 invoked by uid 99); 4 Apr 2016 14:42:26 -0000 Received: from arcas.apache.org (HELO arcas) (140.211.11.28) by apache.org (qpsmtpd/0.29) with ESMTP; Mon, 04 Apr 2016 14:42:26 +0000 Received: from arcas.apache.org (localhost [127.0.0.1]) by arcas (Postfix) with ESMTP id BDB412C1F77 for ; Mon, 4 Apr 2016 14:42:25 +0000 (UTC) Date: Mon, 4 Apr 2016 14:42:25 +0000 (UTC) From: "Keith Turner (JIRA)" To: notifications@accumulo.apache.org Message-ID: In-Reply-To: References: Subject: [jira] [Commented] (ACCUMULO-4177) TinyLFU-based BlockCache MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-JIRA-FingerPrint: 30527f35849b9dde25b450d4833f0394 [ https://issues.apache.org/jira/browse/ACCUMULO-4177?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15224260#comment-15224260 ] Keith Turner commented on ACCUMULO-4177: ---------------------------------------- In the past we have voted on bumping the minimum supported java version starting with the next minor release. We could hold a vote like that for Accumulo 1.8.0. > 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. -- This message was sent by Atlassian JIRA (v6.3.4#6332)