Return-Path: X-Original-To: apmail-cassandra-user-archive@www.apache.org Delivered-To: apmail-cassandra-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 77A0E10AB2 for ; Wed, 28 Aug 2013 20:48:48 +0000 (UTC) Received: (qmail 6972 invoked by uid 500); 28 Aug 2013 20:48:45 -0000 Delivered-To: apmail-cassandra-user-archive@cassandra.apache.org Received: (qmail 6947 invoked by uid 500); 28 Aug 2013 20:48:45 -0000 Mailing-List: contact user-help@cassandra.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: user@cassandra.apache.org Delivered-To: mailing list user@cassandra.apache.org Received: (qmail 6933 invoked by uid 99); 28 Aug 2013 20:48:45 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 28 Aug 2013 20:48:45 +0000 X-ASF-Spam-Status: No, hits=-0.7 required=5.0 tests=RCVD_IN_DNSWL_LOW,SPF_PASS X-Spam-Check-By: apache.org Received-SPF: pass (athena.apache.org: domain of muntasir.raihan@gmail.com designates 209.85.220.51 as permitted sender) Received: from [209.85.220.51] (HELO mail-pa0-f51.google.com) (209.85.220.51) by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 28 Aug 2013 20:48:40 +0000 Received: by mail-pa0-f51.google.com with SMTP id lf1so6757941pab.10 for ; Wed, 28 Aug 2013 13:48:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; bh=8Mnh2XDPCGZiNi0TeRHLZ25NDaRfJgZd2sNWczShbgo=; b=toa3bz5RVnrssT2j5Tk5aYJZV6TsymrKS01EmjroGjvkpyzyp4OViii2ZsAbjJWgrL OjRWir0Re6qz5FeU6CH0qX3s25sJe+a6pJGSl/ze6Prs/idGvYQ+Yjo1gO5cClTWxJmG Wq47ng3yCBZQPJaFcrPxcwfWjF+HQw6gYsKMoOVFGn6piEmqjUtRTq/o5so78lgXS0uL kZA6w04k15Yu4ORibtra/re/+hOXcikKHMrYK00TCM+2xFEVhnvpNeMu3LI+wtD3Hp+Y G0jF/QGLX4nxtRtWw4XjKtNjKrbWl/BbjGn/a/zvT6nu4ESNQGNOOz8XgXEJJ6ORQ12J otwA== MIME-Version: 1.0 X-Received: by 10.66.242.17 with SMTP id wm17mr494889pac.102.1377722900606; Wed, 28 Aug 2013 13:48:20 -0700 (PDT) Received: by 10.70.131.17 with HTTP; Wed, 28 Aug 2013 13:48:20 -0700 (PDT) In-Reply-To: References: Date: Wed, 28 Aug 2013 15:48:20 -0500 Message-ID: Subject: Re: configuring read write quorums in cassandra From: Muntasir Raihan Rahman To: user@cassandra.apache.org Content-Type: text/plain; charset=ISO-8859-1 X-Virus-Checked: Checked by ClamAV on apache.org Sorry, let me clarify. Let us say I set read consistency level = ONE, and I am running the system for a while. Then I want to change the read consistency level to TWO so that reads now wait to hear back from 2 replicas instead of 1 before responding to the client. I want to change this consistency level, and then continue running the system. Does that clarify my query? Thanks Muntasir. On Wed, Aug 28, 2013 at 3:39 PM, Andrey Ilinykh wrote: > What do you mean "to change the cassandra read and write quorums"? Quorum is > quorum, 2 of 3 for example. What do you want to change? > > Andrey > > > On Wed, Aug 28, 2013 at 1:33 PM, Muntasir Raihan Rahman > wrote: >> >> Hello, >> >> Are there any tools (e.g like nodetool) that could be used to change >> the cassandra read and write quorums at run-time? >> >> In general what is a good strategy of changing these system parameters >> while cassandra is running? >> >> Any pointers could be useful! >> >> Thanks >> Muntasir. > > -- Best Regards Muntasir Raihan Rahman Email: muntasir.raihan@gmail.com Department of Computer Science, University of Illinois Urbana Champaign, 3111 Siebel Center, 201 N. Goodwin Avenue, Urbana, IL 61801