From user-return-25950-apmail-cassandra-user-archive=cassandra.apache.org@cassandra.apache.org Sat May 5 19:14:58 2012 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 1EE7EC21C for ; Sat, 5 May 2012 19:14:58 +0000 (UTC) Received: (qmail 19894 invoked by uid 500); 5 May 2012 19:14:55 -0000 Delivered-To: apmail-cassandra-user-archive@cassandra.apache.org Received: (qmail 19854 invoked by uid 500); 5 May 2012 19:14:55 -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 19846 invoked by uid 99); 5 May 2012 19:14:55 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Sat, 05 May 2012 19:14:55 +0000 X-ASF-Spam-Status: No, hits=1.7 required=5.0 tests=FREEMAIL_ENVFROM_END_DIGIT,HTML_MESSAGE,RCVD_IN_DNSWL_LOW,SPF_PASS X-Spam-Check-By: apache.org Received-SPF: pass (athena.apache.org: domain of zamith.28@gmail.com designates 74.125.82.44 as permitted sender) Received: from [74.125.82.44] (HELO mail-wg0-f44.google.com) (74.125.82.44) by apache.org (qpsmtpd/0.29) with ESMTP; Sat, 05 May 2012 19:14:47 +0000 Received: by wgbdr13 with SMTP id dr13so3007847wgb.25 for ; Sat, 05 May 2012 12:14:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:content-type:subject:date:message-id:to:mime-version:x-mailer; bh=c/uEOLiLrwyGl55qCDIEP4KeG2Nn932R1hK0FjifI68=; b=aGBNSUDvfzx2x0g46sYeZNPvbFm0KdR9Rj9dLEYLCxip/pC8mwLKPfZy0KL92wbVyN xq4gf168Wok1RzmuvYPB4brFznUk+tlxf7K9Z9MVLP+v3vWWdqKJ+YqXuX1OryU8GYqu 215z6emzrhxUXPftcQL+I18JldQunx3+lWttVl6yK2kpoFCc3pl7sM+jEoBw+22TzlJi NHNF+PdgQnO4t/7RROJOpI8wm0etfC5Y1tZNBY3olf56lv2kv3TP9AXdSOB8dKGX30MV wPE/4DWSsAXxfL0JBdP3chEY+Ja7TIJczhjHjB87qWRBYIsmq9IfG0sGRWGuCOdpTGkh 0rtQ== Received: by 10.180.96.228 with SMTP id dv4mr22769097wib.14.1336245266778; Sat, 05 May 2012 12:14:26 -0700 (PDT) Received: from zamith.home (a213-22-196-45.cpe.netcabo.pt. [213.22.196.45]) by mx.google.com with ESMTPS id ff2sm12328064wib.9.2012.05.05.12.14.24 (version=TLSv1/SSLv3 cipher=OTHER); Sat, 05 May 2012 12:14:25 -0700 (PDT) From: =?iso-8859-1?Q?Lu=EDs_Ferreira?= Content-Type: multipart/alternative; boundary=Apple-Mail-9--691706619 Subject: Timeout Exception in get_slice Date: Sat, 5 May 2012 20:14:22 +0100 Message-Id: To: user@cassandra.apache.org Mime-Version: 1.0 (Apple Message framework v1084) X-Mailer: Apple Mail (2.1084) X-Virus-Checked: Checked by ClamAV on apache.org --Apple-Mail-9--691706619 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=iso-8859-1 Hi,=20 I'm doing get_slice on huge rows (3 million columns) and even though I = am doing it iteratively I keep getting TimeoutExceptions. I've tried to = change the number of columns fetched but it did not work.=20 I have a 5 machine cluster, each with 4GB of which 3 are dedicated to = cassandra's heap, but still the all consume all of the memory and get = huge IO wait due to the amout of reads. I am running tests with 100 clients all performing multiple operations = mostly get_slice, get and multi_get, but the timeouts only occur in the = get_slice. Does this have anything to do with cassandra's ability (or lack thereof) = to keep the rows in memory? Or am I doing anything wrong? Any tips? Cumpliments, Lu=EDs Ferreira --Apple-Mail-9--691706619 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=iso-8859-1

Cumpliments,
Lu=EDs = Ferreira



= --Apple-Mail-9--691706619--