Received: from maia.hub.org (maia-5.hub.org [200.46.204.29]) by mail.postgresql.org (Postfix) with ESMTP id 1961B1337BA8 for ; Sat, 19 Mar 2011 16:27:17 -0300 (ADT) Received: from mail.postgresql.org ([200.46.204.86]) by maia.hub.org (mx1.hub.org [200.46.204.29]) (amavisd-maia, port 10024) with ESMTP id 85324-08 for ; Sat, 19 Mar 2011 19:27:07 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from shaykin.bluegap.ch (shaykin.bluegap.ch [78.46.81.73]) by mail.postgresql.org (Postfix) with ESMTP id 731B71337BA0 for ; Sat, 19 Mar 2011 16:27:06 -0300 (ADT) Received: from [IPv6:2001:1620:f70:16:216:cbff:fe90:5caa] ([2001:1620:f70:16:216:cbff:fe90:5caa]) (AUTH: LOGIN markus@bluegap.ch, TLS: TLSv1/SSLv3,256bits,AES256-SHA) by shaykin.bluegap.ch with esmtp; Sat, 19 Mar 2011 20:27:05 +0100 id 0000000002A08009.000000004D850389.00004745 Message-ID: <4D850388.5000401@bluegap.ch> Date: Sat, 19 Mar 2011 20:27:04 +0100 From: Markus Wanner User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.16) Gecko/20101227 Icedove/3.0.11 MIME-Version: 1.0 To: Kevin Grittner CC: Robert Haas , Simon Riggs , Alvaro Herrera , Andrew Dunstan , Heikki Linnakangas , MARK CALLAGHAN , Aidan Van Dyk , pgsql-hackers Subject: Re: Re: [COMMITTERS] pgsql: Efficient transaction-controlled synchronous replication. References: <4D741441.2090704@dunslane.net> <1299454125.1696.6138.camel@ebony> <4D74896C.5030402@enterprisedb.com> <4D74DDFA.70800@dunslane.net> <4D74E584.7080409@enterprisedb.com> <4D74E9FA.7070202@dunslane.net> <4D74F3AE.9000802@dunslane.net> <4D74FDEC.5040406@enterprisedb.com> <4D74FF15.1070804@dunslane.net> <1299513979-sup-1987@alvh.no-ip.org> <4D832571.5030808@bluegap.ch> <1300457958.18619.13780.camel@ebony> <4D832B4D020000250003BA98@gw.wicourts.gov> <4D837EA2.2070205@enterprisedb.com> <1300465171.18619.15193.camel@ebony> <4D83B02A.5090105@bluegap.ch> <1300476590.18619.18115.camel@ebony> <4D838723020000250003BAFB@gw.wicourts.gov> <4D838CE1020000250003BB06@gw.wicourts.gov> In-Reply-To: <4D838CE1020000250003BB06@gw.wicourts.gov> X-Enigmail-Version: 1.0.1 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=2.409 tagged_above=-5 required=5 tests=BAYES_00=-1.9, FS_REPLICA=3.599, SARE_SPEC_REPLICA=0.72, T_RP_MATCHES_RCVD=-0.01 X-Spam-Level: ** X-Archive-Number: 201103/1213 X-Sequence-Number: 184463 On 03/18/2011 10:48 PM, Kevin Grittner wrote: > the least of the evils. I guess we should document it, though, so > nobody has a false expectation that seeing something on the replica > means that a connection looking at the master will see something > that current. Agreed. Note, however, that even if there's no such guarantee, it's highly unlikely for a user (or application) to ever notice this during normal operation. Regards Markus Wanner