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 B12BB9FBF for ; Wed, 21 Mar 2012 15:58:55 +0000 (UTC) Received: (qmail 94269 invoked by uid 500); 21 Mar 2012 15:58:53 -0000 Delivered-To: apmail-cassandra-user-archive@cassandra.apache.org Received: (qmail 94238 invoked by uid 500); 21 Mar 2012 15:58:53 -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 94230 invoked by uid 99); 21 Mar 2012 15:58:53 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 21 Mar 2012 15:58:53 +0000 X-ASF-Spam-Status: No, hits=-0.0 required=5.0 tests=RCVD_IN_DNSWL_LOW,SPF_NEUTRAL X-Spam-Check-By: apache.org Received-SPF: neutral (athena.apache.org: local policy) Received: from [74.125.82.44] (HELO mail-wg0-f44.google.com) (74.125.82.44) by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 21 Mar 2012 15:58:45 +0000 Received: by wgbdr13 with SMTP id dr13so620689wgb.25 for ; Wed, 21 Mar 2012 08:58:23 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=mime-version:x-originating-ip:date:message-id:subject:from:to :content-type:x-gm-message-state; bh=4JCug+XAPEi5iic5V5RC/xxDfDmZvVZd/6SWgY6lyKw=; b=NgUrXdWM3dVB/5VB/TIAV7ba/RGH5PcV27eEs/Us3wLfnGAD13GOJtqhtw83WatSrx F0/hpyKb1IGqUIQGK3qNgKepX6FEreFTKeKlOSvDSOnxaoB7NVC70D/HjwsIL40rXKTj 02eIud7ryOI2tjia+OtZxxq59U+lx2T/prx/Ivggs0OLCsfbYzyKyQzTAPjWlXuifp86 0tJjLpNAr8xiKGH+2Cifj4Xc9Vlsr6LzyCbBK3MFbHVrHThRcy9ujjgM/PJUqy3MJVWG YhhRUWVnMgqApX/qVm84LYmp7zZrsxc9ZY2Aq4BSxN0rzs6aYdroGGVatci9Z67HHG0o S27g== MIME-Version: 1.0 Received: by 10.180.101.72 with SMTP id fe8mr10368312wib.4.1332345503410; Wed, 21 Mar 2012 08:58:23 -0700 (PDT) Received: by 10.180.19.129 with HTTP; Wed, 21 Mar 2012 08:58:23 -0700 (PDT) X-Originating-IP: [128.179.67.51] Date: Wed, 21 Mar 2012 16:58:23 +0100 Message-ID: Subject: Attaching a virtual DC From: Pierre-Yves Ritschard To: user Content-Type: text/plain; charset=ISO-8859-1 X-Gm-Message-State: ALoCoQkChngcV5h3kcmzoyxKDIk83HcJ5/6LXdNRIUdfFXWAFZNX6paHF0NaA5Nsbu/CKLJmynw9 X-Virus-Checked: Checked by ClamAV on apache.org Hi, I need to attach a virtual DC to an existing cluster. My existing cluster uses the Ec2Snitch as endpoint_snitch in cassandra.yaml. Since both my clusters will live in the same AZ in AWS, it seems as though my best bet is to switch to a property file snitch to divide. A couple of questions: * My restarts are very slow due to the poor IO on EC2, do I have to restart existing nodes or can I juste use the propertyfile snitch on the new virtual DC nodes ? * To correctly replicate I need to update my placement strategy to networktopology strategy, again no need to restart for this operation, right ?