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 690256F87 for ; Mon, 25 Jul 2011 04:26:35 +0000 (UTC) Received: (qmail 27663 invoked by uid 500); 25 Jul 2011 04:26:33 -0000 Delivered-To: apmail-cassandra-user-archive@cassandra.apache.org Received: (qmail 27204 invoked by uid 500); 25 Jul 2011 04:26:22 -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 27188 invoked by uid 99); 25 Jul 2011 04:26:18 -0000 Received: from nike.apache.org (HELO nike.apache.org) (192.87.106.230) by apache.org (qpsmtpd/0.29) with ESMTP; Mon, 25 Jul 2011 04:26:18 +0000 X-ASF-Spam-Status: No, hits=1.5 required=5.0 tests=FREEMAIL_FROM,HTML_MESSAGE,RCVD_IN_DNSWL_LOW,SPF_PASS X-Spam-Check-By: apache.org Received-SPF: pass (nike.apache.org: domain of edlinuxguru@gmail.com designates 209.85.210.172 as permitted sender) Received: from [209.85.210.172] (HELO mail-iy0-f172.google.com) (209.85.210.172) by apache.org (qpsmtpd/0.29) with ESMTP; Mon, 25 Jul 2011 04:26:10 +0000 Received: by iye7 with SMTP id 7so5224339iye.31 for ; Sun, 24 Jul 2011 21:25:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; bh=/Ey79UusgfX8k3I5JGHlvXQJ8UR3xzb96zHQC6o+y+g=; b=D0iwC7dJ3oHqfmgF+IEy4LU55jyxsMGwR17z6V6PjZ7mWvs2md/6LIWAnIbUt0gI/g nA4u8kWL3a1QpwfuZHLSD8PiV8DEg0cdOb4bUyRBAn5yCKBktJGsHqQQGTLLqMByDNgO sdoknLVRrjRVq1LBpbuFJ/Od//jPiEVD5wzvM= MIME-Version: 1.0 Received: by 10.231.150.4 with SMTP id w4mr4348401ibv.119.1311567949298; Sun, 24 Jul 2011 21:25:49 -0700 (PDT) Received: by 10.42.18.137 with HTTP; Sun, 24 Jul 2011 21:25:49 -0700 (PDT) In-Reply-To: <7aa03d4b.c4e.1315edeb368.Coremail.sei_wjx@126.com> References: <7aa03d4b.c4e.1315edeb368.Coremail.sei_wjx@126.com> Date: Mon, 25 Jul 2011 00:25:49 -0400 Message-ID: Subject: Re: host clocks From: Edward Capriolo To: "user@cassandra.apache.org" Content-Type: multipart/alternative; boundary=0016e68dd284b77cca04a8dd35cd X-Virus-Checked: Checked by ClamAV on apache.org --0016e68dd284b77cca04a8dd35cd Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable You should always sync your host clocks. Clients provide timestamp but for the server gc_grace and ttl columns can have issues if server clocks are no= t correct. On Sunday, July 24, 2011, =E9=AD=8F=E9=87=91=E4=BB=99 wro= te: > hi all, > I'm launching a cassandra cluster with 30 nodes. I wonder whether the inconsistency of host clocks will influence the performance of cluster. > Thanks! > > --0016e68dd284b77cca04a8dd35cd Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable You should always sync your host clocks. Clients provide timestamp but for = the server gc_grace and ttl columns can have issues if server clocks are no= t correct.

On Sunday, July 24, 2011, =E9=AD=8F=E9=87=91=E4=BB=99 &l= t;sei_wjx@126.com> wrote:
> hi all,
> =C2=A0 =C2=A0I'm launching a cassandra cluster wit= h 30 nodes. I wonder whether the inconsistency of host clocks will influenc= e the performance of cluster.
> =C2=A0 Thanks!=C2=A0
>
> --0016e68dd284b77cca04a8dd35cd--