Return-Path: X-Original-To: apmail-hadoop-mapreduce-user-archive@minotaur.apache.org Delivered-To: apmail-hadoop-mapreduce-user-archive@minotaur.apache.org Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by minotaur.apache.org (Postfix) with SMTP id 54655116E4 for ; Tue, 19 Aug 2014 07:49:32 +0000 (UTC) Received: (qmail 70857 invoked by uid 500); 19 Aug 2014 07:49:14 -0000 Delivered-To: apmail-hadoop-mapreduce-user-archive@hadoop.apache.org Received: (qmail 70735 invoked by uid 500); 19 Aug 2014 07:49:14 -0000 Mailing-List: contact user-help@hadoop.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: user@hadoop.apache.org Delivered-To: mailing list user@hadoop.apache.org Received: (qmail 70717 invoked by uid 99); 19 Aug 2014 07:49:13 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 19 Aug 2014 07:49:13 +0000 X-ASF-Spam-Status: No, hits=1.5 required=5.0 tests=HTML_MESSAGE,RCVD_IN_DNSWL_LOW,SPF_PASS X-Spam-Check-By: apache.org Received-SPF: pass (athena.apache.org: domain of adam.retter@googlemail.com designates 74.125.82.47 as permitted sender) Received: from [74.125.82.47] (HELO mail-wg0-f47.google.com) (74.125.82.47) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 19 Aug 2014 07:49:10 +0000 Received: by mail-wg0-f47.google.com with SMTP id b13so5978221wgh.18 for ; Tue, 19 Aug 2014 00:48:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=googlemail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; bh=Fn+/bocPDccB9Pfc+HRubzoo/6EzNO7WNhjyEYIZjOs=; b=gl/FkY1nXdMl+1WlKPCEgTKxbhf6ZGn+qZDkA2RvcW0uXKvy6/l/pxE4KA3PrZUT42 Ke3GXDQW3+TmFm5SZepzJ7bIPIsYjLPyiB6c27p64DeML79BOPFf/pfnak7976BEYecK YlrHj529ov5I41MXQusiLHoP1AAs3DUKvUUHjlas0jqwX0Sytp3b5ZB/RYhRcGlPA08i lrozDoSqzd4vwpdT8H08sSUElSFdc8JnR1HZ/Q3zM52jynrQ0hhKUBvh4WMIc+Wv1baA lLuUjCLgYXXvieGDjzEAAwujCHJHgL8meFRmAImeFkQbRyNEeXxDS1mCk+tKXtykQDch Cphg== MIME-Version: 1.0 X-Received: by 10.195.12.4 with SMTP id em4mr6163372wjd.98.1408434528851; Tue, 19 Aug 2014 00:48:48 -0700 (PDT) Received: by 10.180.21.137 with HTTP; Tue, 19 Aug 2014 00:48:48 -0700 (PDT) Received: by 10.180.21.137 with HTTP; Tue, 19 Aug 2014 00:48:48 -0700 (PDT) In-Reply-To: References: <53F2F169.5050508@rocknob.de> Date: Tue, 19 Aug 2014 08:48:48 +0100 Message-ID: Subject: Re: multi tenancy with cassandra From: Adam Retter To: user Content-Type: multipart/alternative; boundary=047d7bfd029ec83f860500f6b788 X-Virus-Checked: Checked by ClamAV on apache.org --047d7bfd029ec83f860500f6b788 Content-Type: text/plain; charset=UTF-8 HDFS is a really a filesystem on top of a traditional filesystem. HDFS is just a folder with files in it (and this may occur on each node in your hadoop cluster). On 19 Aug 2014 08:42, "Adaryl "Bob" Wakefield, MBA" < adaryl.wakefield@hotmail.com> wrote: > Since Cassandra doesn't store it's data in HDFS, is it possible to install > Cassandra on the same boxes that are running Hadoop? What I'm really asking > is, does HDFS just take over the entire disk or just a segment? Is there > something I'm missing in the understanding of HDFS? I've been thinking > about it like DOS. Is that an incorrect analogy? > > > > Adaryl "Bob" Wakefield, MBA > Principal > Mass Street Analytics > 913.938.6685 > www.linkedin.com/in/bobwakefieldmba > Twitter: @BobLovesData > --047d7bfd029ec83f860500f6b788 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable

HDFS is a really a filesystem on top of a traditional filesy= stem. HDFS is just a folder with files in it (and this may occur on each no= de in your hadoop cluster).

On 19 Aug 2014 08:42, "Adaryl "Bob&quo= t; Wakefield, MBA" <adaryl.wakefield@hotmail.com> wrote:
Since Cassandra doesn't store it's data in HDFS, is it possible to = install Cassandra on the same boxes that are running Hadoop? What I'm r= eally asking is, does HDFS just take over the entire disk or just a segment= ? Is there something I'm missing in the understanding of HDFS? I've= been thinking about it like DOS. Is that an incorrect analogy?



Adaryl "Bob" Wakefield, MBA
Principal
Mass Street Analytics
913.938.6685
ww= w.linkedin.com/in/bobwakefieldmba
Twitter: @BobLovesData
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