Mailing-List: contact common-user-help@hadoop.apache.org; run by ezmlm
Precedence: bulk
Reply-To: common-user@hadoop.apache.org
Received-SPF: pass (nike.apache.org: domain of zjffdu@gmail.com designates
 74.125.82.176 as permitted sender)
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=qltBFino1Rj5lt0mDoNrad63OnXB1plfsTXI1AT1kDC2bj+BBp3Gp2P/DOClUqZQy+
         gH8Q9zONw9kIteST+w3IGDZ4+UTcwUHHag1a3sQzjKOValoM0TKCzfZZByFdd/HOp6FK
         3VhMwwSzj6RU01TVJXgKLnhQ3NBIa9TUjitjk=
MIME-Version: 1.0
In-Reply-To: <732954.171.qm@web15901.mail.cnb.yahoo.com>
References: <BAY149-w48E0FA1F534F2F292F3661F0700@phx.gbl>
	<4C84BEF2.3080507@apache.org>
	<BAY149-w17F5083D6BB74004CF09AEF0720@phx.gbl>
	<732954.171.qm@web15901.mail.cnb.yahoo.com>
Date: Tue, 7 Sep 2010 20:03:58 -0700
Message-ID: <AANLkTin4TE9-gsUyBgRx2KWMvUK9yZ95k-ZzFEN0TSLD@mail.gmail.com>
Subject: Re: change HDFS block size
From: Jeff Zhang <zjffdu@gmail.com>
To: common-user@hadoop.apache.org
Content-Type: text/plain; charset=UTF-8

Those lagacy files won't change block size (NameNode have the mapping
between block and file)
only the new added files will have the block size of 128m


On Tue, Sep 7, 2010 at 7:27 PM, Gang Luo <lgpublic@yahoo.com.cn> wrote:
> Hi all,
> I need to change the block size (from 128m to 64m) and have to shut down the
> cluster first. I was wondering what will happen to the current files on HDFS
> (with 128M block size). Are they still there and usable? If so, what is the
> block size of those lagacy files?
>
> Thanks,
> -Gang
>
>
>
>
>


-- 
Best Regards

Jeff Zhang