Return-Path: Delivered-To: apmail-cassandra-commits-archive@www.apache.org Received: (qmail 45967 invoked from network); 31 Aug 2010 03:47:18 -0000 Received: from unknown (HELO mail.apache.org) (140.211.11.3) by 140.211.11.9 with SMTP; 31 Aug 2010 03:47:18 -0000 Received: (qmail 10551 invoked by uid 500); 31 Aug 2010 03:47:18 -0000 Delivered-To: apmail-cassandra-commits-archive@cassandra.apache.org Received: (qmail 10415 invoked by uid 500); 31 Aug 2010 03:47:16 -0000 Mailing-List: contact commits-help@cassandra.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: dev@cassandra.apache.org Delivered-To: mailing list commits@cassandra.apache.org Received: (qmail 10407 invoked by uid 500); 31 Aug 2010 03:47:15 -0000 Delivered-To: apmail-incubator-cassandra-commits@incubator.apache.org Received: (qmail 10399 invoked by uid 99); 31 Aug 2010 03:47:14 -0000 Received: from Unknown (HELO nike.apache.org) (192.87.106.230) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 31 Aug 2010 03:47:14 +0000 X-ASF-Spam-Status: No, hits=-2000.0 required=10.0 tests=ALL_TRUSTED X-Spam-Check-By: apache.org Received: from [140.211.11.131] (HELO eos.apache.org) (140.211.11.131) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 31 Aug 2010 03:46:57 +0000 Received: from eosnew.apache.org (localhost [127.0.0.1]) by eos.apache.org (Postfix) with ESMTP id 3B92AB47; Tue, 31 Aug 2010 03:46:35 +0000 (UTC) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable From: Apache Wiki To: Apache Wiki Date: Tue, 31 Aug 2010 03:46:34 -0000 Message-ID: <20100831034634.55561.77231@eosnew.apache.org> Subject: =?utf-8?q?=5BCassandra_Wiki=5D_Update_of_=22MemtableThresholds=22_by_Flip?= =?utf-8?q?Kromer?= X-Virus-Checked: Checked by ClamAV on apache.org Dear Wiki user, You have subscribed to a wiki page or wiki category on "Cassandra Wiki" for= change notification. The "MemtableThresholds" page has been changed by FlipKromer. The comment on this change is: Note: in version 0.7b2+, the value will be a= pplied on a per column-family basis. . http://wiki.apache.org/cassandra/MemtableThresholds?action=3Ddiff&rev1=3D17= &rev2=3D18 -------------------------------------------------- = If left unconfigured (missing from the config), this defaults to 128MB. = - ''Note: The value is applied on a per column-family basis.'' + ''Note: in version 0.7b2+, the value will be applied on a [[https://issue= s.apache.org/jira/browse/CASSANDRA-1007|per column-family basis]].'' = =3D=3D=3D MemtableObjectCountInMillions =3D=3D=3D This directive sets a threshold on the number of columns stored. = Left unconfigured (missing from the config), this defaults to 0.1 (or 10= 0,000 objects). The config file's inital setting of 0.3 (or 300,000 objects= ) is a conservative starting point. = - ''Note: The value is applied on a per column-family basis.'' + ''Note: in version 0.7b2+, the value will be applied on a [[https://issue= s.apache.org/jira/browse/CASSANDRA-1007|per column-family basis]].'' + = + = = =3D=3D Using Jconsole To Optimize Thresholds =3D=3D Cassandra's column-family mbeans have a number of attributes that can pro= ve invaluable in determining optimal thresholds. One way to access this ins= trumentation is by using Jconsole, a graphical monitoring and management ap= plication that ships with your JDK.