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 B8BAF9F37 for ; Mon, 6 Feb 2012 21:34:08 +0000 (UTC) Received: (qmail 57546 invoked by uid 500); 6 Feb 2012 21:34:06 -0000 Delivered-To: apmail-cassandra-user-archive@cassandra.apache.org Received: (qmail 57479 invoked by uid 500); 6 Feb 2012 21:34:05 -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 57471 invoked by uid 99); 6 Feb 2012 21:34:05 -0000 Received: from nike.apache.org (HELO nike.apache.org) (192.87.106.230) by apache.org (qpsmtpd/0.29) with ESMTP; Mon, 06 Feb 2012 21:34:05 +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 (nike.apache.org: domain of asgrewal@gmail.com designates 209.85.210.172 as permitted sender) Received: from [209.85.210.172] (HELO mail-iy0-f172.google.com) (209.85.210.172) by apache.org (qpsmtpd/0.29) with ESMTP; Mon, 06 Feb 2012 21:33:58 +0000 Received: by iagf6 with SMTP id f6so10855549iag.31 for ; Mon, 06 Feb 2012 13:33:37 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; bh=GL0nqDzdUALVaxV38dnUZCHIwrzGB2M1tzx6XYSL5m0=; b=KmDOGhxgGAwTSIyRsI2AK/41Vye+f01C9N20nFQSMzCtY13q5UDPUdgU05kdI9jhOr SaoZ1v+Msbr7vz8oo7SwIVg9KnZPWuteX7dbwxZnRfoqMPHrQj0+J3D/aOG7R+PXyGka 4ro3LFP1pdNLv30jmw3NQQQdaJ330RJIL9O4Q= MIME-Version: 1.0 Received: by 10.42.177.133 with SMTP id bi5mr22000535icb.40.1328564017333; Mon, 06 Feb 2012 13:33:37 -0800 (PST) Received: by 10.42.108.67 with HTTP; Mon, 6 Feb 2012 13:33:37 -0800 (PST) In-Reply-To: <68619175-4883-4E76-B5D4-B79A952000BC@thelastpickle.com> References: <68619175-4883-4E76-B5D4-B79A952000BC@thelastpickle.com> Date: Mon, 6 Feb 2012 13:33:37 -0800 Message-ID: Subject: Re: sensible data model ? From: Ajeet Grewal To: user@cassandra.apache.org Content-Type: text/plain; charset=ISO-8859-1 X-Virus-Checked: Checked by ClamAV on apache.org > It's also a good idea to partition time series data so that the rows do not > grow too big. You can have 2 billion columns in a row, but big rows have > operational down sides. What are the down sides here? Unfortunately I have an existing system which I modeled with large rows (because I use the sorted nature of columns to get column ranges). After the amount of data grows, I get "mmap failed" exceptions (See my other thread "Cassandra OOM"). I wonder if there is a connection. -- Regards, Ajeet