Return-Path: Delivered-To: apmail-cassandra-user-archive@www.apache.org Received: (qmail 95447 invoked from network); 28 Apr 2010 14:45:56 -0000 Received: from unknown (HELO mail.apache.org) (140.211.11.3) by 140.211.11.9 with SMTP; 28 Apr 2010 14:45:56 -0000 Received: (qmail 25870 invoked by uid 500); 28 Apr 2010 14:45:55 -0000 Delivered-To: apmail-cassandra-user-archive@cassandra.apache.org Received: (qmail 25851 invoked by uid 500); 28 Apr 2010 14:45:55 -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 25843 invoked by uid 99); 28 Apr 2010 14:45:55 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 28 Apr 2010 14:45:55 +0000 X-ASF-Spam-Status: No, hits=-0.2 required=10.0 tests=AWL,FREEMAIL_FROM,RCVD_IN_DNSWL_NONE,SPF_PASS,T_TO_NO_BRKTS_FREEMAIL X-Spam-Check-By: apache.org Received-SPF: pass (athena.apache.org: domain of jbellis@gmail.com designates 74.125.82.44 as permitted sender) Received: from [74.125.82.44] (HELO mail-ww0-f44.google.com) (74.125.82.44) by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 28 Apr 2010 14:45:50 +0000 Received: by wwi17 with SMTP id 17so1085247wwi.31 for ; Wed, 28 Apr 2010 07:45:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:mime-version:received:in-reply-to :references:from:date:message-id:subject:to:content-type :content-transfer-encoding; bh=/Oo97FYmBJ/pIzRnsXpcJDbbtDwOzmFd2etS1NECVPI=; b=xjKXun04WR+KfkU/p+rmvQbyxzRkn6nV7JWORPigkx0G3f2c1OpxVps1u0TA4Cj/no 9P3yHbBlS++PLOjLn7aRszwB5Vh2aRgwB4jR2JKj75t3RUgjzMZHgGQ8PfDL4aU14gVu LwRdrf9IuEIKx2yyk9nzfLc3ta5cCq5yqXyyk= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :content-type:content-transfer-encoding; b=HtOQFI2mtyZEkuceVhCZDzdwCktfdysCYCNrLznYCqd0UG4hrrI9rAL+4CD/N8CTtj CB3aGedSFPAyQYTaZiWb80kgVQkCTfVtDuyczAqiPsIaZ0tGNjcnfUQ+CzncVXH2hRUz dnHS7PEElAwP5/3hEKP/lRis41nJ04kAvKWMs= Received: by 10.216.87.140 with SMTP id y12mr3440798wee.36.1272465928941; Wed, 28 Apr 2010 07:45:28 -0700 (PDT) MIME-Version: 1.0 Received: by 10.216.22.10 with HTTP; Wed, 28 Apr 2010 07:44:13 -0700 (PDT) In-Reply-To: References: From: Jonathan Ellis Date: Wed, 28 Apr 2010 09:44:13 -0500 Message-ID: Subject: Re: Problem with JVM? concurrent mode failure To: user@cassandra.apache.org Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Yes, incremental mode is definitely contraindicated for Cassandra. On Wed, Apr 28, 2010 at 1:07 AM, Peter Schuller wrote: >> =A0=A0=A0=A0=A0=A0=A0 -XX:+CMSIncrementalMode \ >> =A0=A0=A0=A0=A0=A0=A0 -XX:+CMSIncrementalPacing \ > > This may =A0not be an issue given your other VM opts, but just FYI I > have had some difficulty making the incremental CMS mode perform GC > work sufficiently aggressively to avoid concurrent mode failures > during significant garbage generation. > > You may want to give CMS a try in non-incremental mode (i.e., the > concurrent mark phase will be done in one burst, rather than spread > out over time, but still concurrently). > > -- > / Peter Schuller > --=20 Jonathan Ellis Project Chair, Apache Cassandra co-founder of Riptano, the source for professional Cassandra support http://riptano.com