Received: from malur.postgresql.org ([217.196.149.56]) by arkaria.postgresql.org with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1s1qVI-00FMNB-Lt for pgsql-admin@arkaria.postgresql.org; Tue, 30 Apr 2024 16:38:52 +0000 Received: from localhost ([127.0.0.1] helo=malur.postgresql.org) by malur.postgresql.org with esmtp (Exim 4.94.2) (envelope-from ) id 1s1qVF-0072nU-Tp for pgsql-admin@arkaria.postgresql.org; Tue, 30 Apr 2024 16:38:50 +0000 Received: from magus.postgresql.org ([2a02:c0:301:0:ffff::29]) by malur.postgresql.org with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1s1qVF-0072nL-Ik for pgsql-admin@lists.postgresql.org; Tue, 30 Apr 2024 16:38:50 +0000 Received: from mailout.easymail.ca ([64.68.200.34]) by magus.postgresql.org with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1s1qVD-000sJ4-Kt for pgsql-admin@postgresql.org; Tue, 30 Apr 2024 16:38:49 +0000 Received: from localhost (localhost [127.0.0.1]) by mailout.easymail.ca (Postfix) with ESMTP id 7188D6F0FA; Tue, 30 Apr 2024 16:38:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=elevated-dev.com; s=easymail; t=1714495125; bh=TzFQ5/eyNXv5i0lBR6TmL6uszjRf92JgxK2BzpYZnjk=; h=From:Subject:Date:References:To:In-Reply-To:From; b=CZBBBOlm6qT+Ai4t9QkkWpLhl3h4f+8zwMGQzMvoefmjUPztaM65Ghyyegwun2j4z 3xCf8aOZFMoGJJDvBxcWMaFVD58UlZ/tCDWKcrZ1gYHmzLsN2Qle0x5nfqB4Uv/QH6 TBjZXUGsFHP2NSLghrqNiFSasXXui/FJ6g9SEiaEZ3IWSU8A2MD3Mf/zCiSIn3011g RFI1VIXEG+2QDeyUeHbg/Py1/2ep4AwBqbwos9EimTi2QqmPbPcYMZ6f8Ph9bjWx8j PMfyRZPRFrASOgTysoM1WTTJdlYJfOn+pTCXZpUHY6uvunjo9s1GEgCMylzaV/V1V2 NNmlNM2ZaEiBA== X-Virus-Scanned: Debian amavisd-new at emo07-pco.easydns.vpn Received: from mailout.easymail.ca ([127.0.0.1]) by localhost (emo07-pco.easydns.vpn [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 564XBfympPHq; Tue, 30 Apr 2024 16:38:45 +0000 (UTC) Received: from smtpclient.apple (unknown [165.140.184.195]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mailout.easymail.ca (Postfix) with ESMTPSA id E389D6F0F9; Tue, 30 Apr 2024 16:38:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=elevated-dev.com; s=easymail; t=1714495125; bh=TzFQ5/eyNXv5i0lBR6TmL6uszjRf92JgxK2BzpYZnjk=; h=From:Subject:Date:References:To:In-Reply-To:From; b=CZBBBOlm6qT+Ai4t9QkkWpLhl3h4f+8zwMGQzMvoefmjUPztaM65Ghyyegwun2j4z 3xCf8aOZFMoGJJDvBxcWMaFVD58UlZ/tCDWKcrZ1gYHmzLsN2Qle0x5nfqB4Uv/QH6 TBjZXUGsFHP2NSLghrqNiFSasXXui/FJ6g9SEiaEZ3IWSU8A2MD3Mf/zCiSIn3011g RFI1VIXEG+2QDeyUeHbg/Py1/2ep4AwBqbwos9EimTi2QqmPbPcYMZ6f8Ph9bjWx8j PMfyRZPRFrASOgTysoM1WTTJdlYJfOn+pTCXZpUHY6uvunjo9s1GEgCMylzaV/V1V2 NNmlNM2ZaEiBA== From: Scott Ribe Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Mime-Version: 1.0 (Mac OS X Mail 16.0 \(3774.500.171.1.1\)) Subject: Re: HA Setup Review Date: Tue, 30 Apr 2024 10:38:34 -0600 References: To: akshay polji , pgsql-admin In-Reply-To: Message-Id: X-Mailer: Apple Mail (2.3774.500.171.1.1) List-Id: List-Help: List-Subscribe: List-Post: List-Owner: List-Archive: Archived-At: Precedence: bulk > On Apr 30, 2024, at 10:29=E2=80=AFAM, akshay polji = wrote: >=20 > So do you think that even such a cluster with 3 node pgpool + = postgresql (running on the same machine) Synchronous Replication (Any = one out of the two replicas) would mean Primary DB will be at risk of = degraded performance?=20 All cloud providers have downtime and outages. Maybe this is reliable = enough for you, but just don't treat it as a guarantee. The point is: if = a network glitch, or failure of a replica, can cascade to cause failure = of primary, is that really HA?