Received: from malur.postgresql.org ([217.196.149.56]) by arkaria.postgresql.org with esmtp (Exim 4.80) (envelope-from ) id 1WqRhd-0004sW-1t for pgsql-hackers@arkaria.postgresql.org; Fri, 30 May 2014 18:38:53 +0000 Received: from localhost ([127.0.0.1] helo=postgresql.org) by malur.postgresql.org with smtp (Exim 4.80) (envelope-from ) id 1WqRhc-0000Ul-EM for pgsql-hackers@arkaria.postgresql.org; Fri, 30 May 2014 18:38:52 +0000 Received: from magus.postgresql.org ([2a02:c0:301:0:ffff::29]) by malur.postgresql.org with esmtps (TLS1.2:DHE_RSA_AES_256_CBC_SHA256:256) (Exim 4.80) (envelope-from ) id 1WqRhb-0000Ud-5b for pgsql-hackers@postgresql.org; Fri, 30 May 2014 18:38:51 +0000 Received: from smtp-outbound-2.vmware.com ([208.91.2.13]) by magus.postgresql.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.80) (envelope-from ) id 1WqRhW-0003WE-QM for pgsql-hackers@postgresql.org; Fri, 30 May 2014 18:38:50 +0000 Received: from sc9-mailhost2.vmware.com (sc9-mailhost2.vmware.com [10.113.161.72]) by smtp-outbound-2.vmware.com (Postfix) with ESMTP id 4E61098F29; Fri, 30 May 2014 11:38:42 -0700 (PDT) Received: from zcs-prod-ext-mta-2.vmware.com (zcs-prod-ext-mta-2.vmware.com [10.113.62.224]) by sc9-mailhost2.vmware.com (Postfix) with ESMTP id 8611EA83DD; Fri, 30 May 2014 11:38:41 -0700 (PDT) Received: from zcs-prod-ext-mta-2.vmware.com (localhost.localdomain [127.0.0.1]) by zcs-prod-ext-mta-2.vmware.com (Postfix) with ESMTP id BEF81C005F; Fri, 30 May 2014 11:38:50 -0700 (PDT) Received: from [192.168.1.90] (zimbra-prod-ext-proxy-vip.vmware.com [10.113.63.87]) by zcs-prod-ext-mta-2.vmware.com (Postfix) with ESMTPSA; Fri, 30 May 2014 11:38:48 -0700 (PDT) Message-ID: <5388D02D.6040305@vmware.com> Date: Fri, 30 May 2014 21:38:37 +0300 From: Heikki Linnakangas Organization: VMware User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Icedove/24.5.0 MIME-Version: 1.0 To: Andres Freund CC: Alvaro Herrera , Robert Haas , Bruce Momjian , Rajeev rastogi , Ants Aasma , PostgreSQL-development , Markus Wanner Subject: Re: Proposal for CSN based snapshots References: <51B6C97B.1070000@bluegap.ch> <5370D323.1070606@vmware.com> <20140512144112.GB9619@awork2.anarazel.de> <5370E267.2020904@vmware.com> <20140515183436.GD25053@momjian.us> <20140515200632.GB16014@awork2.anarazel.de> <20140515213714.GB7857@eldon.alvh.no-ip.org> <53889CCB.7030005@vmware.com> <20140530152721.GC30516@awork2.anarazel.de> In-Reply-To: <20140530152721.GC30516@awork2.anarazel.de> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Pg-Spam-Score: -7.6 (-------) List-Archive: List-Help: List-ID: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: X-Mailing-List: pgsql-hackers Precedence: bulk Sender: pgsql-hackers-owner@postgresql.org (forgot to answer this question) On 05/30/2014 06:27 PM, Andres Freund wrote: > On 2014-05-30 17:59:23 +0300, Heikki Linnakangas wrote: >> * I expanded pg_clog to 64-bits per XID, but people suggested keeping >> pg_clog as is, with two bits per commit, and adding a new SLRU for the >> commit LSNs beside it. Probably will need to do something like that to avoid >> bloating the clog. > > It also influences how on-disk compatibility is dealt with. So: How are > you planning to deal with on-disk compatibility? Have pg_upgrade read the old clog and write it out in the new format. - Heikki -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers