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 8F6166944 for ; Thu, 16 Jun 2011 14:47:24 +0000 (UTC) Received: (qmail 27197 invoked by uid 500); 16 Jun 2011 14:47:22 -0000 Delivered-To: apmail-cassandra-user-archive@cassandra.apache.org Received: (qmail 27168 invoked by uid 500); 16 Jun 2011 14:47:22 -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 27160 invoked by uid 99); 16 Jun 2011 14:47:22 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 16 Jun 2011 14:47:22 +0000 X-ASF-Spam-Status: No, hits=2.2 required=5.0 tests=HTML_MESSAGE,RCVD_IN_DNSWL_LOW,SPF_NEUTRAL X-Spam-Check-By: apache.org Received-SPF: neutral (athena.apache.org: local policy) Received: from [209.85.210.172] (HELO mail-iy0-f172.google.com) (209.85.210.172) by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 16 Jun 2011 14:47:14 +0000 Received: by iyn15 with SMTP id 15so1582936iyn.31 for ; Thu, 16 Jun 2011 07:46:53 -0700 (PDT) MIME-Version: 1.0 Received: by 10.42.210.203 with SMTP id gl11mr777847icb.35.1308235613138; Thu, 16 Jun 2011 07:46:53 -0700 (PDT) Received: by 10.231.200.146 with HTTP; Thu, 16 Jun 2011 07:46:53 -0700 (PDT) X-Originating-IP: [76.10.173.68] Date: Thu, 16 Jun 2011 10:46:53 -0400 Message-ID: Subject: Cassandra JVM GC settings From: Sebastien Coutu To: user@cassandra.apache.org Content-Type: multipart/alternative; boundary=20cf303bffd600ed8704a5d557cc --20cf303bffd600ed8704a5d557cc Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Hi Everyone, I'm seeing Cassandra GC a lot and I would like to tune the Young space and the Tenured space. Anyone would have recommendations on the NewRatio or NewSize/MaxNewSize to use for an environment where Cassandra has several column families and in which we are doing a mixed load of reading and writing. The JVM has 8G of heap space assigned to it and there are 9 nodes to this cluster. Thanks for the comments! S=E9bastien Coutu --20cf303bffd600ed8704a5d557cc Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Hi Everyone,

I'm seeing Cassandra GC a lot and I wou= ld like to tune the Young space and the Tenured space. Anyone would have re= commendations on the NewRatio or NewSize/MaxNewSize to use for an environme= nt where Cassandra has several column families and in which we are doing a = mixed load of reading and writing. The JVM has 8G of heap space assigned to= it and there are 9 nodes to this cluster.

Thanks for the comments!

S=E9bastien Cout= u
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