Return-Path: X-Original-To: apmail-cassandra-user-archive@www.apache.org Delivered-To: apmail-cassandra-user-archive@www.apache.org Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by minotaur.apache.org (Postfix) with SMTP id 2EAC57737 for ; Tue, 27 Dec 2011 19:25:01 +0000 (UTC) Received: (qmail 89311 invoked by uid 500); 27 Dec 2011 19:24:59 -0000 Delivered-To: apmail-cassandra-user-archive@cassandra.apache.org Received: (qmail 89280 invoked by uid 500); 27 Dec 2011 19:24:59 -0000 Mailing-List: contact user-help@cassandra.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: user@cassandra.apache.org Delivered-To: mailing list user@cassandra.apache.org Received: (qmail 89272 invoked by uid 99); 27 Dec 2011 19:24:59 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 27 Dec 2011 19:24:59 +0000 X-ASF-Spam-Status: No, hits=-0.7 required=5.0 tests=RCVD_IN_DNSWL_LOW,SPF_PASS X-Spam-Check-By: apache.org Received-SPF: pass (athena.apache.org: domain of scode@scode.org designates 74.125.82.172 as permitted sender) Received: from [74.125.82.172] (HELO mail-we0-f172.google.com) (74.125.82.172) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 27 Dec 2011 19:24:52 +0000 Received: by werb14 with SMTP id b14so6434492wer.31 for ; Tue, 27 Dec 2011 11:24:30 -0800 (PST) MIME-Version: 1.0 Received: by 10.216.135.32 with SMTP id t32mr20219077wei.17.1325013870803; Tue, 27 Dec 2011 11:24:30 -0800 (PST) Sender: scode@scode.org Received: by 10.180.99.34 with HTTP; Tue, 27 Dec 2011 11:24:30 -0800 (PST) X-Originating-IP: [71.202.44.53] In-Reply-To: References: <1325012941.12466.YahooMailNeo@web31801.mail.mud.yahoo.com> Date: Tue, 27 Dec 2011 11:24:30 -0800 X-Google-Sender-Auth: DcNfV69WaEWf1CbtzfUefX5Fam8 Message-ID: Subject: Re: will compaction delete empty rows after all columns expired? From: Peter Schuller To: user@cassandra.apache.org, Feng Qu Content-Type: text/plain; charset=UTF-8 >> Compaction should delete empty rows once gc_grace_seconds is passed, right? > > Yes. But just to be extra clear: Data will not actually be removed once the row in question participates in compaction. Compactions will not be actively triggered by Cassandra for tombstone processing reasons. -- / Peter Schuller (@scode, http://worldmodscode.wordpress.com)