Return-Path: Delivered-To: apmail-incubator-cassandra-user-archive@minotaur.apache.org Received: (qmail 53086 invoked from network); 21 Jan 2010 02:52:58 -0000 Received: from hermes.apache.org (HELO mail.apache.org) (140.211.11.3) by minotaur.apache.org with SMTP; 21 Jan 2010 02:52:58 -0000 Received: (qmail 18122 invoked by uid 500); 21 Jan 2010 02:52:57 -0000 Delivered-To: apmail-incubator-cassandra-user-archive@incubator.apache.org Received: (qmail 18051 invoked by uid 500); 21 Jan 2010 02:52:57 -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 18042 invoked by uid 99); 21 Jan 2010 02:52:57 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 21 Jan 2010 02:52:57 +0000 X-ASF-Spam-Status: No, hits=3.4 required=10.0 tests=HTML_MESSAGE,SPF_NEUTRAL X-Spam-Check-By: apache.org Received-SPF: neutral (athena.apache.org: local policy) Received: from [209.85.220.214] (HELO mail-fx0-f214.google.com) (209.85.220.214) by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 21 Jan 2010 02:52:50 +0000 Received: by fxm6 with SMTP id 6so1315344fxm.0 for ; Wed, 20 Jan 2010 18:52:28 -0800 (PST) MIME-Version: 1.0 Received: by 10.103.84.31 with SMTP id m31mr421488mul.124.1264042348247; Wed, 20 Jan 2010 18:52:28 -0800 (PST) In-Reply-To: <468b21171001200823x69700db9x7422fffe826fcaff@mail.gmail.com> References: <468b21171001200823x69700db9x7422fffe826fcaff@mail.gmail.com> Date: Wed, 20 Jan 2010 21:52:28 -0500 Message-ID: <22dabfc71001201852t1e491417v9196868612842775@mail.gmail.com> Subject: Re: How to lower the number of has reached it's threshold ? From: Ryan Daum To: cassandra-user@incubator.apache.org Content-Type: multipart/alternative; boundary=0016e65b62aa25f9dd047da3cb0a --0016e65b62aa25f9dd047da3cb0a Content-Type: text/plain; charset=ISO-8859-1 > > > > The second question is really direct : do you think it's insane to use EC2 > small instance to build a cassandra cluster. The machine are virtualized > with 2G memory > > We are using 6 ec2 small instances + EBS to build a cluster. I can't say it's seen significant stress -- perhaps 50 writes a second, but performance has been acceptable for us on writes. Reads are not as fast as I would like -- 3600 row keys with 60,000 super columns retrieved in about 10seconds, but again, acceptable for our purposes. I'd be interested to see how you net out and what you decide for configuration. Large instances are unfortunately quite a bit more expensive than small, but at least the have advantage of 64-bit CPU and more memory. Ryan --0016e65b62aa25f9dd047da3cb0a Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable


The second question is really direct : do you think it's insane to = use EC2 small instance to build a cassandra cluster. The machine are virtua= lized with 2G memory


We are = using 6 ec2 small instances + EBS to build a cluster. I can't say it= 9;s seen significant stress -- perhaps 50 writes a second, but performance = has been acceptable for us on writes. Reads are not as fast as I would like= -- 3600 row keys with 60,000 super columns retrieved in about 10seconds, b= ut again, acceptable for our purposes.

I'd be interested to see how you net out and what y= ou decide for configuration. =A0Large instances are unfortunately quite a b= it more expensive than small, but at least the have advantage of 64-bit CPU= and more memory.

Ryan
--0016e65b62aa25f9dd047da3cb0a--