From user-return-3413-apmail-cassandra-user-archive=cassandra.apache.org@cassandra.apache.org Sun Mar 21 03:12:00 2010 Return-Path: Delivered-To: apmail-cassandra-user-archive@www.apache.org Received: (qmail 64961 invoked from network); 21 Mar 2010 03:11:59 -0000 Received: from unknown (HELO mail.apache.org) (140.211.11.3) by 140.211.11.9 with SMTP; 21 Mar 2010 03:11:59 -0000 Received: (qmail 30133 invoked by uid 500); 21 Mar 2010 03:11:59 -0000 Delivered-To: apmail-cassandra-user-archive@cassandra.apache.org Received: (qmail 30077 invoked by uid 500); 21 Mar 2010 03:11:59 -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 30066 invoked by uid 99); 21 Mar 2010 03:11:58 -0000 Received: from nike.apache.org (HELO nike.apache.org) (192.87.106.230) by apache.org (qpsmtpd/0.29) with ESMTP; Sun, 21 Mar 2010 03:11:58 +0000 X-ASF-Spam-Status: No, hits=2.2 required=10.0 tests=FREEMAIL_FROM,HTML_MESSAGE,SPF_PASS,T_TO_NO_BRKTS_FREEMAIL X-Spam-Check-By: apache.org Received-SPF: pass (nike.apache.org: domain of gpcuster@gmail.com designates 74.125.83.172 as permitted sender) Received: from [74.125.83.172] (HELO mail-pv0-f172.google.com) (74.125.83.172) by apache.org (qpsmtpd/0.29) with ESMTP; Sun, 21 Mar 2010 03:11:49 +0000 Received: by pvh1 with SMTP id 1so2371798pvh.31 for ; Sat, 20 Mar 2010 20:11:28 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:in-reply-to:references :date:message-id:subject:from:to:content-type; bh=1NioAEzqHRnNKMVn8XS+fD4abevqEDktxIU/3F7owRc=; b=KUzhp4nqyLpUhxF3YXeAkRvSbBoygU/CgdYJvt+5dVFVqYZbqZAD/sVyZcCCWO9Fnt MSn8MMAu3Ke5+gFwNxw5juhqfcppaOiztsGAZ6lw99UiYxy6QOZSto1u+slXpXnzz5sF +d/uht3ZlZleqi05SGeVmoya7mNnGuSpqek2U= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; b=XbTmGu10EsUxeCeTeu577EhpOCjuXznUz2m/aX5SBgRHjkrZI+oiyLl8Et4XZXWL8b bfXlNh5qduI/Mv3aUN2PGhrW5rxgMsUE3Irw0YYweJzZAeIjjEc+NwNgUazyHRy/YYCr D3G2L9ZBoNnUeO9qx8DMijjrPQtMovX8cikSM= MIME-Version: 1.0 Received: by 10.143.180.5 with SMTP id h5mr2324008wfp.298.1269141088154; Sat, 20 Mar 2010 20:11:28 -0700 (PDT) In-Reply-To: References: <47d8831a1003200644p429e6b22j47c26c18b2440f8d@mail.gmail.com> <47d8831a1003201953p5e0309abm462ffb4f70ccf609@mail.gmail.com> Date: Sun, 21 Mar 2010 11:11:28 +0800 Message-ID: <47d8831a1003202011q7941b790rdd8a3203f8897715@mail.gmail.com> Subject: Re: why Cassandra 0.5.1 write speed is very slow From: =?GB2312?B?ufnF9A==?= To: user@cassandra.apache.org Content-Type: multipart/alternative; boundary=000e0cd60842bab7a7048246ef64 X-Virus-Checked: Checked by ClamAV on apache.org --000e0cd60842bab7a7048246ef64 Content-Type: text/plain; charset=GB2312 Content-Transfer-Encoding: quoted-printable Good ideal, I will try it with client multithread write. But I don't understand the meaning of "d the latency in cluster mode hurts that much more." Thx. 2010/3/21 Jonathan Ellis > 2010/3/20 =B9=F9=C5=F4 : > > :) > > > > I just want to know why the write speed is ok in the standalone mode bu= t > too > > slow in the cluster mode. > > > > Am I doing something wrong? > > Probably, but it's hard to say what. > > Maybe you're just not using enough threads in your benchmark and the > latency in cluster mode hurts that much more. > --=20 Regards Peng Guo --000e0cd60842bab7a7048246ef64 Content-Type: text/html; charset=GB2312 Content-Transfer-Encoding: quoted-printable Good ideal, I will try it with client multithread write.

But I don&#= 39;t understand the meaning of "d the latency in cluster mode hurts th= at much more."

Thx.

2010/3/21= Jonathan Ellis <= jbellis@gmail.com>
2010/3/20 =B9=F9= =C5=F4 <gpcuster@gmail.com>= :
> :)
>
> I just want to know why the write speed is ok in the standalone mode b= ut too
> slow in the cluster mode.
>
> Am I doing something wrong?

Probably, but it's hard to say what.

Maybe you're just not using enough threads in your benchmark and the latency in cluster mode hurts that much more.



--
Regards
  &nbs= p;Peng Guo
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