Mailing-List: contact core-user-help@hadoop.apache.org; run by ezmlm
Precedence: bulk
Reply-To: core-user@hadoop.apache.org
Received-SPF: pass (athena.apache.org: domain of grafan@gmail.com designates
 74.125.46.28 as permitted sender)
DomainKey-Signature: a=rsa-sha1; c=nofws;
        d=gmail.com; s=gamma;
        h=message-id:date:from:to:subject:mime-version:content-type
         :content-transfer-encoding:content-disposition;
        b=CFpkIn9fWcWmaRGQVWUQ/3I1fsroAT1hIlvd5wOfmdjHI9MXEjOgWpvk0Ek/TFsS5Q
         IBjfhJpJc/0DDNNE3XY4VvMmaAts2wcYlgSHK0RGoH9jxQCO5lz3LimHYtfI3nS8mat3
         Vu2x1cWA6h51axFxVCjOuon72/CfL7NlhtNEk=
Message-ID: <6eb82e0807141843p4066990cna04d1d61f7810acb@mail.gmail.com>
Date: Tue, 15 Jul 2008 09:43:34 +0800
From: "Rong-en Fan" <grafan@gmail.com>
To: core-user@hadoop.apache.org
Subject: different dfs block size
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 7bit
Content-Disposition: inline

Hi,

I'm wondering what would be the memory consumption of
dfs.block.size for a fixed set of data in NameNode? I know
it is determined by # of blocks and # of replications, but
how many memory does one block will use in NameNode?
In addition, what would be the pros/cons of bigger/smaller
block size?

Thanks,
Rong-En Fan