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 E88634904 for ; Wed, 8 Jun 2011 10:31:29 +0000 (UTC) Received: (qmail 19784 invoked by uid 500); 8 Jun 2011 10:31:27 -0000 Delivered-To: apmail-cassandra-user-archive@cassandra.apache.org Received: (qmail 19760 invoked by uid 500); 8 Jun 2011 10:31:27 -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 19752 invoked by uid 99); 8 Jun 2011 10:31:27 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 08 Jun 2011 10:31:27 +0000 X-ASF-Spam-Status: No, hits=0.7 required=5.0 tests=RCVD_IN_DNSWL_NONE,SPF_NEUTRAL X-Spam-Check-By: apache.org Received-SPF: neutral (athena.apache.org: local policy) Received: from [204.13.248.66] (HELO mho-01-ewr.mailhop.org) (204.13.248.66) by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 08 Jun 2011 10:31:20 +0000 Received: from 75-166-66-241.hlrn.qwest.net ([75.166.66.241] helo=[192.168.0.2]) by mho-01-ewr.mailhop.org with esmtpsa (TLSv1:CAMELLIA256-SHA:256) (Exim 4.72) (envelope-from ) id 1QUG2M-000Mlh-In for user@cassandra.apache.org; Wed, 08 Jun 2011 10:30:58 +0000 X-Mail-Handler: MailHop Outbound by DynDNS X-Originating-IP: 75.166.66.241 X-Report-Abuse-To: abuse@dyndns.com (see http://www.dyndns.com/services/mailhop/outbound_abuse.html for abuse reporting information) X-MHO-User: U2FsdGVkX18OtcAgNAlAvAiauz8zOizuUPx2tkw9LII= Message-ID: <4DEF4F5D.20404@dude.podzone.net> Date: Wed, 08 Jun 2011 04:30:53 -0600 From: AJ User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.2.17) Gecko/20110414 Lightning/1.0b2 Thunderbird/3.1.10 MIME-Version: 1.0 To: user@cassandra.apache.org Subject: Re: Misc Performance Questions References: <4DEF24EF.90103@dude.podzone.net> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Thank you Richard! On 6/8/2011 2:57 AM, Richard Low wrote: > There is however a difference in running multiple column families > versus putting everything in the same column family and separating > them with e.g. a key prefix. E.g. if you have a large data set and a > small one, it will be quicker to query the small one if it is in its > own column family. > I assumed that a read would be O(1) for any size CF since Cass is implemented with hashmaps. Do you know why size matters? (forgive the pun)