Received: from malur.postgresql.org ([217.196.149.56]) by arkaria.postgresql.org with esmtp (Exim 4.80) (envelope-from ) id 1YbAUA-0005Lc-BP for pgsql-admin@arkaria.postgresql.org; Thu, 26 Mar 2015 16:18:22 +0000 Received: from localhost ([127.0.0.1] helo=postgresql.org) by malur.postgresql.org with smtp (Exim 4.80) (envelope-from ) id 1YbAU9-0001Ce-7O for pgsql-admin@arkaria.postgresql.org; Thu, 26 Mar 2015 16:18:21 +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 1YbAU8-0001CY-DR for pgsql-admin@postgresql.org; Thu, 26 Mar 2015 16:18:20 +0000 Received: from mailout.easymail.ca ([64.68.201.169]) by magus.postgresql.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.80) (envelope-from ) id 1YbAU4-0004Qn-60 for pgsql-admin@postgresql.org; Thu, 26 Mar 2015 16:18:19 +0000 Received: from localhost (localhost [127.0.0.1]) by mailout.easymail.ca (Postfix) with ESMTP id A99DCE46A; Thu, 26 Mar 2015 12:18:12 -0400 (EDT) X-Virus-Scanned: Debian amavisd-new at mailout.easymail.ca X-Spam-Flag: NO X-Spam-Score: -3.935 X-Spam-Level: X-Spam-Status: No, score=-3.935 required=5 tests=[ALL_TRUSTED=-1.8, AWL=-0.228, BAYES_00=-2.599, DNS_FROM_AHBL_RHSBL=0.692] Received: from mailout.easymail.ca ([127.0.0.1]) by localhost (easymail-mailout.easydns.vpn [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 2dGOQCpIh1eI; Thu, 26 Mar 2015 12:18:09 -0400 (EDT) Received: from [192.168.2.16] (unknown [8.39.228.5]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mailout.easymail.ca (Postfix) with ESMTPSA id 372F2E423; Thu, 26 Mar 2015 12:18:09 -0400 (EDT) Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 8.2 \(2070.6\)) Subject: Re: postgres hot-standby questions. From: Scott Ribe In-Reply-To: <8A0640B6-CE88-4E03-B145-0B6149DE7173@skogoglandskap.no> Date: Thu, 26 Mar 2015 10:18:06 -0600 Cc: "pgsql-admin@postgresql.org" Content-Transfer-Encoding: quoted-printable Message-Id: <06AC2E5A-2205-4CF5-82E6-9C35FBDDBF7F@elevated-dev.com> References: <848F3721-4A21-4260-9640-8F698E3EE376@skogoglandskap.no> <3C08D5DD-0702-4136-BBE3-21CBE064ADDE@elevated-dev.com> <8A0640B6-CE88-4E03-B145-0B6149DE7173@skogoglandskap.no> To: "Graeme B. Bell" X-Mailer: Apple Mail (2.2070.6) X-Pg-Spam-Score: -2.6 (--) List-Archive: List-Help: List-ID: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: X-Mailing-List: pgsql-admin Precedence: bulk Sender: pgsql-admin-owner@postgresql.org On Mar 26, 2015, at 10:08 AM, Graeme B. Bell wrote: >=20 > Assuming that you have your server configured with 1 or more hot standbys. > Are there situations where it is smart & sane to allow a controlled (slow= , not emergency) shutdown to complete asynchronously without knowing if any= standby got the last bits of wal? Sure. Point updates. Shut down 9.4.0. Immediately re-start 9.4.1 on the same clus= ter. OS security update, reboot server, PG shuts down and re-starts on boot. Etc. I don't care in those cases what the state of the network and my remote rep= licas are. The replication is interrupted briefly, and then resumes. --=20 Scott Ribe scott_ribe@elevated-dev.com http://www.elevated-dev.com/ https://www.linkedin.com/in/scottribe/ (303) 722-0567 voice --=20 Sent via pgsql-admin mailing list (pgsql-admin@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-admin