Return-Path: X-Original-To: apmail-cassandra-commits-archive@www.apache.org Delivered-To: apmail-cassandra-commits-archive@www.apache.org Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by minotaur.apache.org (Postfix) with SMTP id 49BD9CE40 for ; Tue, 16 Jul 2013 18:42:51 +0000 (UTC) Received: (qmail 5190 invoked by uid 500); 16 Jul 2013 18:42:51 -0000 Delivered-To: apmail-cassandra-commits-archive@cassandra.apache.org Received: (qmail 5159 invoked by uid 500); 16 Jul 2013 18:42:51 -0000 Mailing-List: contact commits-help@cassandra.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: dev@cassandra.apache.org Delivered-To: mailing list commits@cassandra.apache.org Received: (qmail 5145 invoked by uid 99); 16 Jul 2013 18:42:51 -0000 Received: from arcas.apache.org (HELO arcas.apache.org) (140.211.11.28) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 16 Jul 2013 18:42:51 +0000 Date: Tue, 16 Jul 2013 18:42:50 +0000 (UTC) From: "Jonathan Ellis (JIRA)" To: commits@cassandra.apache.org Message-ID: In-Reply-To: References: Subject: [jira] [Comment Edited] (CASSANDRA-5515) Track sstable coldness 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/CASSANDRA-5515?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13710062#comment-13710062 ] Jonathan Ellis edited comment on CASSANDRA-5515 at 7/16/13 6:40 PM: -------------------------------------------------------------------- Just tracking the read counts for now, then we can build on top of it. Which might be out of scope for 2.0.x, but I don't expect that adding the tracking will be very invasive. Still, just having the information available will be useful. was (Author: jbellis): Just tracking the read counts for now, then we can build on top of it. (Which might be out of scope for 2.0.x, but I don't expect that adding the tracking will be very invasive.) > Track sstable coldness > ---------------------- > > Key: CASSANDRA-5515 > URL: https://issues.apache.org/jira/browse/CASSANDRA-5515 > Project: Cassandra > Issue Type: New Feature > Components: Core > Reporter: Jonathan Ellis > Assignee: Tyler Hobbs > Fix For: 2.0.1 > > > Keeping a count of reads per-sstable would allow STCS to automatically ignore cold data rather than recompacting it constantly with hot data, dramatically reducing compaction load for typical time series applications and others with time-correlated access patterns. We would not need a separate age-tiered compaction strategy. > (This will really be useful in conjunction with CASSANDRA-5514.) -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira