Return-Path: Delivered-To: apmail-hadoop-hdfs-user-archive@minotaur.apache.org Received: (qmail 68809 invoked from network); 6 Jan 2011 08:24:12 -0000 Received: from hermes.apache.org (HELO mail.apache.org) (140.211.11.3) by minotaur.apache.org with SMTP; 6 Jan 2011 08:24:12 -0000 Received: (qmail 27061 invoked by uid 500); 6 Jan 2011 08:24:12 -0000 Delivered-To: apmail-hadoop-hdfs-user-archive@hadoop.apache.org Received: (qmail 26720 invoked by uid 500); 6 Jan 2011 08:24:10 -0000 Mailing-List: contact hdfs-user-help@hadoop.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: hdfs-user@hadoop.apache.org Delivered-To: mailing list hdfs-user@hadoop.apache.org Received: (qmail 26623 invoked by uid 99); 6 Jan 2011 08:24:09 -0000 Received: from nike.apache.org (HELO nike.apache.org) (192.87.106.230) by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 06 Jan 2011 08:24:09 +0000 X-ASF-Spam-Status: No, hits=2.2 required=10.0 tests=HTML_MESSAGE,RCVD_IN_DNSWL_LOW,SPF_NEUTRAL X-Spam-Check-By: apache.org Received-SPF: neutral (nike.apache.org: local policy) Received: from [209.85.214.176] (HELO mail-iw0-f176.google.com) (209.85.214.176) by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 06 Jan 2011 08:24:03 +0000 Received: by iwn2 with SMTP id 2so18482709iwn.35 for ; Thu, 06 Jan 2011 00:23:42 -0800 (PST) Received: by 10.231.190.139 with SMTP id di11mr8156276ibb.21.1294302221952; Thu, 06 Jan 2011 00:23:41 -0800 (PST) MIME-Version: 1.0 Received: by 10.231.115.8 with HTTP; Thu, 6 Jan 2011 00:23:21 -0800 (PST) In-Reply-To: <4D253F32.2010200@above.net.tw> References: <4D253F32.2010200@above.net.tw> From: Todd Lipcon Date: Thu, 6 Jan 2011 00:23:21 -0800 Message-ID: Subject: Re: response time increase?? To: hdfs-user@hadoop.apache.org Content-Type: multipart/alternative; boundary=0016367b6c842be6a40499293800 X-Virus-Checked: Checked by ClamAV on apache.org --0016367b6c842be6a40499293800 Content-Type: text/plain; charset=ISO-8859-1 Hi Kevin, No, there is no O(number of datanodes) factor in performance. -Todd On Wed, Jan 5, 2011 at 8:04 PM, KevinKuei wrote: > Hi, > > I'm planing for a youtube-like video online site and looking for a suitable > file system. > The high performance and reliability of HDFS seems to be the great > candidate. > > But somebody told me that the response time will be linear increased with > more data node. > I've no enough hardwares to do the test for now. > > It will be very appreciated if anyone can provide such information. > > Thanks!! > > -- > Kevin Kuei > > -- > This message has been scanned for viruses and > dangerous content by MailScanner, and is > believed to be clean. > > -- Todd Lipcon Software Engineer, Cloudera --0016367b6c842be6a40499293800 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Hi Kevin,

No, there is no O(number of datanodes) factor = in performance.

-Todd

On Wed, Jan 5, 2011 at 8:04 PM, KevinKuei &l= t;kkuei@above.net.tw> w= rote:

Hi,

I'm planing for a youtube-like video online site and looking for a suit= able file system.
The high performance and reliability of HDFS seems to be the great candidat= e.

But somebody told me that the response time will be linear increased with m= ore data node.
I've no enough hardwares to do the test for now.

It will be very appreciated if anyone can provide such information.

Thanks!!

--
Kevin Kuei

--
This message has been scanned for viruses and
dangerous content by MailScanner, and is
believed to be clean.

--
Todd Lipcon
S= oftware Engineer, Cloudera

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