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 3D69317336 for ; Sat, 30 May 2015 04:33:18 +0000 (UTC) Received: (qmail 66276 invoked by uid 500); 30 May 2015 04:33:18 -0000 Delivered-To: apmail-cassandra-commits-archive@cassandra.apache.org Received: (qmail 66230 invoked by uid 500); 30 May 2015 04:33:18 -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 66215 invoked by uid 99); 30 May 2015 04:33:17 -0000 Received: from arcas.apache.org (HELO arcas.apache.org) (140.211.11.28) by apache.org (qpsmtpd/0.29) with ESMTP; Sat, 30 May 2015 04:33:17 +0000 Date: Sat, 30 May 2015 04:33:17 +0000 (UTC) From: "Jeff Jirsa (JIRA)" To: commits@cassandra.apache.org Message-ID: In-Reply-To: References: Subject: [jira] [Updated] (CASSANDRA-8340) Use sstable min timestamp when deciding if an sstable should be included in DTCS compactions 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-8340?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Jeff Jirsa updated CASSANDRA-8340: ---------------------------------- Attachment: (was: 8340.diff) > Use sstable min timestamp when deciding if an sstable should be included in DTCS compactions > -------------------------------------------------------------------------------------------- > > Key: CASSANDRA-8340 > URL: https://issues.apache.org/jira/browse/CASSANDRA-8340 > Project: Cassandra > Issue Type: Improvement > Reporter: Marcus Eriksson > Priority: Minor > Attachments: 8340.diff > > > Currently we check how old the newest data (max timestamp) in an sstable is when we check if it should be compacted. > If we instead switch to using min timestamp for this we have a pretty clean migration path from STCS/LCS to DTCS. > My thinking is that before migrating, the user does a major compaction, which creates a huge sstable containing all data, with min timestamp very far back in time, then switching to DTCS, we will have a big sstable that we never compact (ie, min timestamp of this big sstable is before max_sstable_age_days), and all newer data will be after that, and that new data will be properly compacted > WDYT [~Bj0rn] ? -- This message was sent by Atlassian JIRA (v6.3.4#6332)