From user-return-11760-apmail-zookeeper-user-archive=zookeeper.apache.org@zookeeper.apache.org Mon Nov 5 19:35:14 2018 Return-Path: X-Original-To: apmail-zookeeper-user-archive@www.apache.org Delivered-To: apmail-zookeeper-user-archive@www.apache.org Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by minotaur.apache.org (Postfix) with SMTP id 512DA1828C for ; Mon, 5 Nov 2018 19:35:14 +0000 (UTC) Received: (qmail 82728 invoked by uid 500); 5 Nov 2018 19:35:13 -0000 Delivered-To: apmail-zookeeper-user-archive@zookeeper.apache.org Received: (qmail 82665 invoked by uid 500); 5 Nov 2018 19:35:13 -0000 Mailing-List: contact user-help@zookeeper.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: user@zookeeper.apache.org Delivered-To: mailing list user@zookeeper.apache.org Received: (qmail 82653 invoked by uid 99); 5 Nov 2018 19:35:12 -0000 Received: from pnap-us-west-generic-nat.apache.org (HELO spamd2-us-west.apache.org) (209.188.14.142) by apache.org (qpsmtpd/0.29) with ESMTP; Mon, 05 Nov 2018 19:35:12 +0000 Received: from localhost (localhost [127.0.0.1]) by spamd2-us-west.apache.org (ASF Mail Server at spamd2-us-west.apache.org) with ESMTP id 3DF231A1778 for ; Mon, 5 Nov 2018 19:35:12 +0000 (UTC) X-Virus-Scanned: Debian amavisd-new at spamd2-us-west.apache.org X-Spam-Flag: NO X-Spam-Score: 1.889 X-Spam-Level: * X-Spam-Status: No, score=1.889 tagged_above=-999 required=6.31 tests=[DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=2, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, T_DKIMWL_WL_MED=-0.01] autolearn=disabled Authentication-Results: spamd2-us-west.apache.org (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mx1-lw-eu.apache.org ([10.40.0.8]) by localhost (spamd2-us-west.apache.org [10.40.0.9]) (amavisd-new, port 10024) with ESMTP id acrm_90gmXN1 for ; Mon, 5 Nov 2018 19:35:11 +0000 (UTC) Received: from mail-yw1-f49.google.com (mail-yw1-f49.google.com [209.85.161.49]) by mx1-lw-eu.apache.org (ASF Mail Server at mx1-lw-eu.apache.org) with ESMTPS id C24905F180 for ; Mon, 5 Nov 2018 19:35:10 +0000 (UTC) Received: by mail-yw1-f49.google.com with SMTP id c126-v6so4142703ywd.8 for ; Mon, 05 Nov 2018 11:35:10 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to; bh=ZaVvTNxk4p2BrvIFG8roo7Xnl7IfqDgextEUVxjRMYw=; b=AeAyR5UFcRG6KBAwXXDy1tEoKSBmVt8GKyttOxAiATG3hNiRZ5w5hMwfSn9e49Ihcq rF/XcHPt+BFEZ8BZbrXdd8VzKAJViR81hsGCOXk5Y+wzMdGsw/dtj7UEo2Z5olrXlHeZ 1jojz3dEK3u20qnEQoDC2D5C6nrDbSlddOw5TfZEvDeP6DC+VaaskzTiBcjTqVqnZUS4 8U4lSofx11dHrZZuO2nCTTe/yhGHuesLYQ8Vu9kxXqHbC3fa5KrwtcKIG3hMqO1iI7RX TgVmI4PglY8LY3eBKESA3Ag/1QRUchk6CDjOw5omiPzvjy1OPWZCwW0hDlj2ajGBEi3M 9hSg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=ZaVvTNxk4p2BrvIFG8roo7Xnl7IfqDgextEUVxjRMYw=; b=eBCl9etQFgiHR0+K0icswdeQDQuzWb4aTCVVy4HKAkXZI9Fr2v4SXKW5XcZI5MWXCT 3mmRJr+joKEud6blJ4sRpIj1loCr8rTw8H0xZIz2MOjEwmhN9XGUFTA0m5fesPrn3ahb eTkYohvwjAgUWHAHXQqrBXSZHHM6A8SlyXzMvyUfHBkeaKhP6ra6CHWrZN5Dp1+bT9Sg VcMGbpQZeqxzK8zcq0Rzl7ALKd6nGKCdhYlSZaRuN5bsRkj8fXuixYw4c16jkx9V0jni SxlJ2uuQNDthv9qZRjvdGnmSmQ5UkxR6U70QIu4e4de4MGSczQkoWeTwfGgJEZPwNrQu rPqQ== X-Gm-Message-State: AGRZ1gI53MbNMarbVSqkYMAV4RZVG6YSFC03yTe5fhLyzCfAhuvsdLMI dliqpfuTrtnoLVPt4yVgQKAWgK61XP7LRR57pKmEhqf4 X-Google-Smtp-Source: AJdET5f3dC5AShDXQvea3MveWZP/UpFQEtXVpecdJZTpKQqdh3dbw97QFZpo53iK3VXCHXQ1pOptqpxhoBX1Col5A5Y= X-Received: by 2002:a81:7bc1:: with SMTP id w184-v6mr22018589ywc.345.1541446509465; Mon, 05 Nov 2018 11:35:09 -0800 (PST) MIME-Version: 1.0 From: Sujay Paranjape Date: Mon, 5 Nov 2018 14:34:58 -0500 Message-ID: Subject: Need of having observers in Participant's configuration list To: user@zookeeper.apache.org Content-Type: multipart/alternative; boundary="000000000000a314c30579effb8e" --000000000000a314c30579effb8e Content-Type: text/plain; charset="UTF-8" If I want to add observers to zookeeper cluster, why is it required to have observers in the Quorum participant's configuration list ? We can start observers without having them in the participant's configuration list and leader still forwards them transactions. If I am not wrong, when a follower / observer joins the quorum, leader communicates to it about its leadership and follower/ observer makes sure that majority is following the leader. That makes it necessary to have all the participants in observers configuration list. But is it really required for a) participants to know about observers ? b) observers to know about other observers ? --000000000000a314c30579effb8e--