Return-Path: Delivered-To: apmail-incubator-cassandra-user-archive@minotaur.apache.org Received: (qmail 38512 invoked from network); 4 Feb 2010 22:36:11 -0000 Received: from hermes.apache.org (HELO mail.apache.org) (140.211.11.3) by minotaur.apache.org with SMTP; 4 Feb 2010 22:36:11 -0000 Received: (qmail 86730 invoked by uid 500); 4 Feb 2010 22:36:11 -0000 Delivered-To: apmail-incubator-cassandra-user-archive@incubator.apache.org Received: (qmail 86698 invoked by uid 500); 4 Feb 2010 22:36:10 -0000 Mailing-List: contact cassandra-user-help@incubator.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: cassandra-user@incubator.apache.org Delivered-To: mailing list cassandra-user@incubator.apache.org Received: (qmail 86689 invoked by uid 99); 4 Feb 2010 22:36:10 -0000 Received: from nike.apache.org (HELO nike.apache.org) (192.87.106.230) by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 04 Feb 2010 22:36:10 +0000 X-ASF-Spam-Status: No, hits=-0.0 required=10.0 tests=SPF_PASS X-Spam-Check-By: apache.org Received-SPF: pass (nike.apache.org: domain of jbellis@gmail.com designates 74.125.82.47 as permitted sender) Received: from [74.125.82.47] (HELO mail-ww0-f47.google.com) (74.125.82.47) by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 04 Feb 2010 22:36:02 +0000 Received: by wwb13 with SMTP id 13so338864wwb.6 for ; Thu, 04 Feb 2010 14:35:42 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:in-reply-to:references :from:date:message-id:subject:to:content-type; bh=gKYSFFQ/YrnyZvKZMasrHMy0ARWIEnZTB3CcszQJgO8=; b=PafWxGwb0txCk70/SmDIUjYkuL+ohURNatqgvs5t5QO3CSYut0VR5PKV1Aw5/bKYxb jhpPFQfJsA8cTTU34KzMfwDqwwqiYtawLuYV+wTl6uy823uEM84Vk/2wxPCjszVxcmhm h/h18jRJ4Nqqfqhu/oeytagD4Ddy1WmxJDi4M= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :content-type; b=ak5ByNJZ9dRZ7jCZTPM8BGQsGMMwagSgHRWFBxBz9dNtaZq1QxThhzzqQzQWO7Gpxq NS74pPbszcfexlOA8LfI0RYHwCFhTXiCk8e+gcB7p2Vzf6mACQyRAum3aQ/0QAIltAvP 7h0LdRk1VJaGIfAG1aLPh/o/J36E741IMq+Lk= MIME-Version: 1.0 Received: by 10.216.91.73 with SMTP id g51mr993177wef.68.1265322942227; Thu, 04 Feb 2010 14:35:42 -0800 (PST) In-Reply-To: References: <2713B0D9C27EC945861BD5281186658439BFD876A9@SP1-EX07VS01.ds.corp.yahoo.com> From: Jonathan Ellis Date: Thu, 4 Feb 2010 16:35:22 -0600 Message-ID: Subject: Re: Cassandra versus HBase performance study To: cassandra-user@incubator.apache.org Content-Type: text/plain; charset=ISO-8859-1 X-Virus-Checked: Checked by ClamAV on apache.org On Wed, Feb 3, 2010 at 9:45 PM, Brian Frank Cooper wrote: > We are using get_range_slice, and the AsciiType comparator. I'll try to run a test with BytesType; but how much difference do you expect? Dunno. We really haven't done a lot with this; it's not even in our stress test tool. Compaction is roughly 2x as fast with bytestype as asciitype, and scanning is vaguely similar to that. > I would be interested to know the types of optimizations you are planning. We are trying to understand how much of the performance results from fundamental design decisions versus how much results from the fact that the system is still under development. Right now scanning does one pass to get the keys, then another to get the slices, so merging those is the really obvious one. -Jonathan