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 558BC4CF8 for ; Thu, 23 Jun 2011 21:06:17 +0000 (UTC) Received: (qmail 75254 invoked by uid 500); 23 Jun 2011 21:06:15 -0000 Delivered-To: apmail-cassandra-user-archive@cassandra.apache.org Received: (qmail 75160 invoked by uid 500); 23 Jun 2011 21:06:15 -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 75152 invoked by uid 99); 23 Jun 2011 21:06:14 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 23 Jun 2011 21:06:14 +0000 X-ASF-Spam-Status: No, hits=2.2 required=5.0 tests=HTML_MESSAGE,RCVD_IN_DNSWL_LOW,SPF_NEUTRAL X-Spam-Check-By: apache.org Received-SPF: neutral (athena.apache.org: local policy) Received: from [209.85.215.172] (HELO mail-ey0-f172.google.com) (209.85.215.172) by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 23 Jun 2011 21:06:07 +0000 Received: by eye13 with SMTP id 13so852960eye.31 for ; Thu, 23 Jun 2011 14:05:45 -0700 (PDT) Received: by 10.14.0.6 with SMTP id 6mr1627884eea.93.1308863145260; Thu, 23 Jun 2011 14:05:45 -0700 (PDT) MIME-Version: 1.0 Sender: les.hazlewood@katasoft.com Received: by 10.14.187.137 with HTTP; Thu, 23 Jun 2011 14:05:25 -0700 (PDT) X-Originating-IP: [24.5.183.156] In-Reply-To: References: From: Les Hazlewood Date: Thu, 23 Jun 2011 14:05:25 -0700 X-Google-Sender-Auth: T1bKuWAW0CPNRkZiK8Ok7F3rPfY Message-ID: Subject: Re: No Transactions: An Example To: user@cassandra.apache.org Content-Type: multipart/alternative; boundary=00504502b395d5369b04a667726b --00504502b395d5369b04a667726b Content-Type: text/plain; charset=ISO-8859-1 Hi Dominic, Thanks so much for providing this information. I was unaware of Cages and this looks like it could be used effectively for certain things. This is because Cassandra uses the timestamps of columns that have been > written during reconciliation to determine which should be persisted when > they conflict. > Aren't vector clocks available in 0.8 now? Or more accurately, increment counters? https://issues.apache.org/jira/browse/CASSANDRA-1072 This would imply that an artificial delay is no longer necessary. Or am I missing something? Regards, Les --00504502b395d5369b04a667726b Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Hi Dominic,

Thanks so much for providing this informatio= n. =A0I was unaware of Cages and this looks like it could be used effective= ly for certain things.

This is because Cassandra uses the timestamps of columns that have bee= n written during reconciliation to determine which should be persisted when= they conflict.=A0

Aren't vector = clocks available in 0.8 now? Or more accurately, increment counters?


This would imply that an artificial delay is no longer nec= essary. =A0Or am I missing something?

Regards,

Les
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