Return-Path: Delivered-To: apmail-cassandra-user-archive@www.apache.org Received: (qmail 63674 invoked from network); 6 Jul 2010 12:04:47 -0000 Received: from unknown (HELO mail.apache.org) (140.211.11.3) by 140.211.11.9 with SMTP; 6 Jul 2010 12:04:47 -0000 Received: (qmail 73663 invoked by uid 500); 6 Jul 2010 12:04:45 -0000 Delivered-To: apmail-cassandra-user-archive@cassandra.apache.org Received: (qmail 73464 invoked by uid 500); 6 Jul 2010 12:04:42 -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 73456 invoked by uid 99); 6 Jul 2010 12:04:41 -0000 Received: from nike.apache.org (HELO nike.apache.org) (192.87.106.230) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 06 Jul 2010 12:04:41 +0000 X-ASF-Spam-Status: No, hits=-0.0 required=10.0 tests=RCVD_IN_DNSWL_NONE,SPF_PASS X-Spam-Check-By: apache.org Received-SPF: pass (nike.apache.org: local policy) Received: from [208.113.200.5] (HELO blingymail-a1.g.dreamhost.com) (208.113.200.5) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 06 Jul 2010 12:04:32 +0000 Received: from [10.0.1.153] (121-73-157-230.cable.telstraclear.net [121.73.157.230]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) by blingymail-a1.g.dreamhost.com (Postfix) with ESMTP id A40AE5C52E for ; Tue, 6 Jul 2010 05:04:09 -0700 (PDT) Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Apple Message framework v1081) Subject: Re: Which node is coordinator node? From: aaron morton In-Reply-To: Date: Wed, 7 Jul 2010 00:04:05 +1200 Content-Transfer-Encoding: quoted-printable Message-Id: <6D608BFE-69D6-4998-B38A-6ADCBD889261@thelastpickle.com> References: To: user@cassandra.apache.org X-Mailer: Apple Mail (2.1081) X-Virus-Checked: Checked by ClamAV on apache.org Which ever node the client connects to is the coordinator node. It will = take care of sending the messages to the nodes who will do the actual = work.=20 If you have multiple nodes try a DNS round robin to distribute client = connections around.=20 Aaron On 6 Jul 2010, at 22:10, ChingShen wrote: > Hi all,=20 >=20 > I'm newbie in Cassandra, I have a question about which node is = coordinator node in my cluster. >=20 > I have A, B, C, D, E, F and G nodes. if I run a write operation on "A" = node, and key range between A and B, so the A node is responsible to = write the key to B, C and D nodes(RF=3D3) ? and does it mean A node is = coordinator node? >=20 > Thanks. >=20 > Shen