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 0FF728B47 for ; Fri, 9 Sep 2011 15:41:42 +0000 (UTC) Received: (qmail 14236 invoked by uid 500); 9 Sep 2011 15:41:39 -0000 Delivered-To: apmail-cassandra-user-archive@cassandra.apache.org Received: (qmail 14167 invoked by uid 500); 9 Sep 2011 15:41:39 -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 14133 invoked by uid 99); 9 Sep 2011 15:41:38 -0000 Received: from nike.apache.org (HELO nike.apache.org) (192.87.106.230) by apache.org (qpsmtpd/0.29) with ESMTP; Fri, 09 Sep 2011 15:41:38 +0000 X-ASF-Spam-Status: No, hits=-0.7 required=5.0 tests=RCVD_IN_DNSWL_LOW,SPF_PASS X-Spam-Check-By: apache.org Received-SPF: pass (nike.apache.org: local policy) Received: from [150.140.141.169] (HELO poseidon.ceid.upatras.gr) (150.140.141.169) by apache.org (qpsmtpd/0.29) with ESMTP; Fri, 09 Sep 2011 15:41:29 +0000 Received: from mail.ceid.upatras.gr (unknown [10.1.0.143]) by poseidon.ceid.upatras.gr (Postfix) with ESMTP id CD3F1EB47BC for ; Fri, 9 Sep 2011 18:41:07 +0300 (EEST) Received: from localhost (europa.ceid.upatras.gr [127.0.0.1]) by mail.ceid.upatras.gr (Postfix) with ESMTP id 85A3C1601B2 for ; Fri, 9 Sep 2011 18:41:07 +0300 (EEST) X-Virus-Scanned: amavisd-new at ceid.upatras.gr Received: from mail.ceid.upatras.gr ([127.0.0.1]) by localhost (europa.ceid.upatras.gr [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 4JSwubymuyrJ for ; Fri, 9 Sep 2011 18:41:07 +0300 (EEST) Received: by mail.ceid.upatras.gr (Postfix, from userid 48) id 649A61601B3; Fri, 9 Sep 2011 18:41:07 +0300 (EEST) Received: from 94.64.239.205 by webmail.ceid.upatras.gr with HTTP; Fri, 9 Sep 2011 18:41:07 +0300 (EEST) Message-ID: <63568.94.64.239.205.1315582867.squirrel@webmail.ceid.upatras.gr> Date: Fri, 9 Sep 2011 18:41:07 +0300 (EEST) Subject: Mutations during selects From: altanis@ceid.upatras.gr To: user@cassandra.apache.org User-Agent: SquirrelMail/1.4.8-5.el5_3.7 MIME-Version: 1.0 Content-Type: text/plain;charset=utf-8 Content-Transfer-Encoding: 8bit X-Priority: 3 (Normal) Importance: Normal X-Virus-Checked: Checked by ClamAV on apache.org I see that Cassandra updates secondary indices as soon as a value of the indexed column is updated. This can happen, for example, during a select query with a condition on a secondary index. Does Cassandra perform no checking or locking? Will the result of this select, with old and new values, be returned as is? Am I missing some reason why this isn't a problem? Alexander