Return-Path: Delivered-To: apmail-cassandra-user-archive@www.apache.org Received: (qmail 98176 invoked from network); 25 Oct 2010 16:07:54 -0000 Received: from unknown (HELO mail.apache.org) (140.211.11.3) by 140.211.11.9 with SMTP; 25 Oct 2010 16:07:54 -0000 Received: (qmail 69859 invoked by uid 500); 25 Oct 2010 16:07:53 -0000 Delivered-To: apmail-cassandra-user-archive@cassandra.apache.org Received: (qmail 69791 invoked by uid 500); 25 Oct 2010 16:07:52 -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 69783 invoked by uid 99); 25 Oct 2010 16:07:52 -0000 Received: from nike.apache.org (HELO nike.apache.org) (192.87.106.230) by apache.org (qpsmtpd/0.29) with ESMTP; Mon, 25 Oct 2010 16:07:52 +0000 X-ASF-Spam-Status: No, hits=0.0 required=10.0 tests=FREEMAIL_FROM,RCVD_IN_DNSWL_NONE,SPF_PASS X-Spam-Check-By: apache.org Received-SPF: pass (nike.apache.org: domain of jbellis@gmail.com designates 209.85.161.44 as permitted sender) Received: from [209.85.161.44] (HELO mail-fx0-f44.google.com) (209.85.161.44) by apache.org (qpsmtpd/0.29) with ESMTP; Mon, 25 Oct 2010 16:07:45 +0000 Received: by fxm9 with SMTP id 9so2453628fxm.31 for ; Mon, 25 Oct 2010 09:07:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:received:in-reply-to :references:date:message-id:subject:from:to:content-type :content-transfer-encoding; bh=s4KTptFC3QzQD3Uo96LImMOBV6Jb9yL385MgDay0WYk=; b=Fx3yPwwaDvqyYH0fAVzqp/5BZrUiz0yFpmSA12sqiisbb5KvQqJ1DBPaCUeWJpbxrK PLdDL1YwfkN35pjiZDNhn0xT9QthNxozsDfnxJfjYaU/+OcJuK0CvTbNQ5rYPy0qPdAA Olz3faSnLDgiZ2BPUa7RQ1U70NkZR6iIjjlwQ= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type:content-transfer-encoding; b=dflpPxBzJWIkM/j5ibDm/uTAUA0ZKSNfbbzdHrHc+gdQnF/QSNVhYivfY2ObAdpbeP KhWcqHGVzrRCFfTjejm2V7IiJOG2Cb0iJoCUjppUrLC3+rWWqtro/bmBkTibSMQWhTKd oV4gacLJfhzEgxUnRgGFV8Q+vfQAOw6LClC/I= MIME-Version: 1.0 Received: by 10.216.143.163 with SMTP id l35mr5863381wej.68.1288022845251; Mon, 25 Oct 2010 09:07:25 -0700 (PDT) Received: by 10.216.52.16 with HTTP; Mon, 25 Oct 2010 09:07:25 -0700 (PDT) In-Reply-To: References: <4CC59708.9080804@gmail.com> Date: Mon, 25 Oct 2010 11:07:25 -0500 Message-ID: Subject: Re: Experiences with Cassandra hardware planning From: Jonathan Ellis To: user Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable X-Virus-Checked: Checked by ClamAV on apache.org On Mon, Oct 25, 2010 at 10:25 AM, Edward Capriolo w= rote: >> 2. We gave up on using Cassandra's row cache as loading any reasonable >> amount of data into the cache would take days/weeks with our tiny row si= ze. >> =A0We instead are using file system cache. I don't follow the reasoning there. Row cache or fs cache, it will be hot after reading it once, the difference is that doing a read to the cached data is much faster from row cache. >> 4. When Cassandra is set to replication factor of three and the read rep= lica >> count is one, data still gets read (for read repair) on all three nodes = that >> have a copy of the data. FWIW, you don't have to wait for 0.7 to turn this off (see http://www.riptano.com/blog/whats-new-cassandra-066). However, to pin affinity to a single replica you will need SimpleStrategy from 0.7. --=20 Jonathan Ellis Project Chair, Apache Cassandra co-founder of Riptano, the source for professional Cassandra support http://riptano.com