Return-Path: Delivered-To: apmail-cassandra-user-archive@www.apache.org Received: (qmail 18816 invoked from network); 8 Oct 2010 00:00:00 -0000 Received: from unknown (HELO mail.apache.org) (140.211.11.3) by 140.211.11.9 with SMTP; 8 Oct 2010 00:00:00 -0000 Received: (qmail 20485 invoked by uid 500); 7 Oct 2010 23:59:59 -0000 Delivered-To: apmail-cassandra-user-archive@cassandra.apache.org Received: (qmail 20447 invoked by uid 500); 7 Oct 2010 23:59:59 -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 20439 invoked by uid 99); 7 Oct 2010 23:59:59 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 07 Oct 2010 23:59:58 +0000 X-ASF-Spam-Status: No, hits=2.9 required=10.0 tests=HTML_MESSAGE,RCVD_IN_DNSWL_NONE,SPF_NEUTRAL X-Spam-Check-By: apache.org Received-SPF: neutral (athena.apache.org: local policy) Received: from [209.85.215.44] (HELO mail-ew0-f44.google.com) (209.85.215.44) by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 07 Oct 2010 23:59:52 +0000 Received: by ewy21 with SMTP id 21so318520ewy.31 for ; Thu, 07 Oct 2010 16:59:29 -0700 (PDT) MIME-Version: 1.0 Received: by 10.14.37.10 with SMTP id x10mr960330eea.6.1286495969052; Thu, 07 Oct 2010 16:59:29 -0700 (PDT) Received: by 10.14.29.66 with HTTP; Thu, 7 Oct 2010 16:59:28 -0700 (PDT) X-Originating-IP: [99.200.48.88] Received: by 10.14.29.66 with HTTP; Thu, 7 Oct 2010 16:59:28 -0700 (PDT) In-Reply-To: References: <162486.3403.qm@web55205.mail.re4.yahoo.com> Date: Thu, 7 Oct 2010 18:59:28 -0500 Message-ID: Subject: Re: Heap Settings suggestions From: Matthew Dennis To: user@cassandra.apache.org Content-Type: multipart/alternative; boundary=90e6ba539efa3d8a3804920faf0a --90e6ba539efa3d8a3804920faf0a Content-Type: text/plain; charset=ISO-8859-1 Keep in mind that .7 and on will have per-CF settings for most things so there will be even more control over the the tuning... On Oct 7, 2010 3:10 PM, "Peter Schuller" wrote: >> What if there is more than one keyspace in the system ? Assuming each >> keyspace has the same number of column families, Can I linearly scale the >> above recommendation to the number of keyspaces in the system .ie, if the >> "X" is the heap size for a single keyspace and there are "Y" keyspaces, Is >> it recommended to allocate "XY" as the max Heap size ? Please let me know. > > Yes. Each column family will have a memtable subject to the configured > memory constraints; whether or not they are in different keyspaces > does not matter. > > -- > / Peter Schuller --90e6ba539efa3d8a3804920faf0a Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable

Keep in mind that .7 and on will have per-CF settings for most things so= there will be even more control over the the tuning...

On Oct 7, 2010 3:10 PM, "Peter Schuller&quo= t; <peter.schuller@infidy= ne.com> wrote:
>> What if there is mor= e than one keyspace in the system ? Assuming each
>> keyspace has the same number of column families, Can I linearly sc= ale the
>> above recommendation to the number of keyspaces in the = system .ie, if the
>> "X" is the heap size for a single = keyspace and there are "Y" keyspaces, Is
>> it recommended to allocate "XY" as the max=A0 Heap size = ?=A0 Please let me know.
>
> Yes. Each column family will have= a memtable subject to the configured
> memory constraints; whether o= r not they are in different keyspaces
> does not matter.
>
> --
> / Peter Schuller
--90e6ba539efa3d8a3804920faf0a--