Return-Path: Delivered-To: apmail-cassandra-user-archive@www.apache.org Received: (qmail 92910 invoked from network); 13 Feb 2011 17:48:06 -0000 Received: from hermes.apache.org (HELO mail.apache.org) (140.211.11.3) by minotaur.apache.org with SMTP; 13 Feb 2011 17:48:06 -0000 Received: (qmail 18950 invoked by uid 500); 13 Feb 2011 17:48:04 -0000 Delivered-To: apmail-cassandra-user-archive@cassandra.apache.org Received: (qmail 18655 invoked by uid 500); 13 Feb 2011 17:48:00 -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 18647 invoked by uid 99); 13 Feb 2011 17:48:00 -0000 Received: from nike.apache.org (HELO nike.apache.org) (192.87.106.230) by apache.org (qpsmtpd/0.29) with ESMTP; Sun, 13 Feb 2011 17:48:00 +0000 X-ASF-Spam-Status: No, hits=3.6 required=5.0 tests=FS_REPLICA,RCVD_IN_DNSWL_LOW,SPF_NEUTRAL X-Spam-Check-By: apache.org Received-SPF: neutral (nike.apache.org: local policy) Received: from [67.192.241.181] (HELO smtp181.dfw.emailsrvr.com) (67.192.241.181) by apache.org (qpsmtpd/0.29) with ESMTP; Sun, 13 Feb 2011 17:47:54 +0000 Received: from localhost (localhost.localdomain [127.0.0.1]) by smtp8.relay.dfw1a.emailsrvr.com (SMTP Server) with ESMTP id 8644581B3 for ; Sun, 13 Feb 2011 12:47:33 -0500 (EST) X-Virus-Scanned: OK Received: by smtp8.relay.dfw1a.emailsrvr.com (Authenticated sender: eevans-AT-racklabs.com) with ESMTPSA id 5EC6E8193 for ; Sun, 13 Feb 2011 12:47:33 -0500 (EST) Subject: Re: Explaining the Replication Factor, N and W and R From: Eric Evans To: user@cassandra.apache.org In-Reply-To: <25518DB8-F772-48B9-B2DB-ABCDFEDBACFB@ecyrd.com> References: <25518DB8-F772-48B9-B2DB-ABCDFEDBACFB@ecyrd.com> Content-Type: text/plain; charset="UTF-8" Date: Sun, 13 Feb 2011 11:50:37 -0600 Message-ID: <1297619437.4738.44.camel@erebus.lan> Mime-Version: 1.0 X-Mailer: Evolution 2.30.3 Content-Transfer-Encoding: 7bit X-Virus-Checked: Checked by ClamAV on apache.org On Sun, 2011-02-13 at 15:49 +0200, Janne Jalkanen wrote: > as it seems that wrapping the brain around the R+W>N concept is a big > hurdle for a lot of users, I made a simple web page that allows you to > try out the different parameters and see how they affect the system. > > http://www.ecyrd.com/cassandracalculator/ > > Let me know if you have any suggestions to improve the wording, or you > spot a bug. Trying to go for simplicity and clarity over absolute > correctness here, as this is meant to help newbies. > > (App is completely self-contained HTML and Javascript.) Neat. -- Eric Evans eevans@rackspace.com