Mailing-List: contact user-help@cassandra.apache.org; run by ezmlm
Precedence: bulk
Reply-To: user@cassandra.apache.org
Received-SPF: pass (nike.apache.org: domain of cbalvarez@gmail.com designates
 209.85.216.44 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=maIbDB/JPbEcPDzirNhIoLwsuojxBfJbkA3/Y2jalIoZZ1N+AIOk2ZOre90LU7GBf8
         yb8RBYHVw1DGS5vHxdPe58bESW7vkpV/ie0U4OH6uCGwRaar5zw+AO1x8rPTuBwtwqRk
         lvlvLpiHEZ5DXmxNlFMgSQdOv2uhkiUx+YTak=
MIME-Version: 1.0
In-Reply-To: <AANLkTim2vZbTqUc96Efc9BYVTtMwvY6WzA3i7Y9AGBEk@mail.gmail.com>
References: <AANLkTinThH0H1d-b5RGWF0OkEcK2twOMU+ydBoPoLNj4@mail.gmail.com>
	<AANLkTikUmHQJba576miZovE4fp1pf=1Ww=y8Do0nF2YF@mail.gmail.com>
	<AANLkTincTpyKdUUcAEvkwjrBc4j=Et=fLS5Cxrbqiw8q@mail.gmail.com>
	<AANLkTim13pVi_iySMEvQYFkdbWrGn+30t1Bp7RRrRfUr@mail.gmail.com>
	<AANLkTi=zHW2d+sCs9VhXA3Auta1+3YigG6SEWi2DSESs@mail.gmail.com>
	<AANLkTi=xfCVuf0xAovog4zVQcsgG=nxi7ypr+yobbO+S@mail.gmail.com>
	<AANLkTikXiG-QHM0qjBbdESMvMrZfcdrzYaLoUMctTzEw@mail.gmail.com>
	<AANLkTim2vZbTqUc96Efc9BYVTtMwvY6WzA3i7Y9AGBEk@mail.gmail.com>
Date: Fri, 26 Nov 2010 16:09:56 -0300
Message-ID: <AANLkTikYHrxKNfpyT50maeZvSe35yFSY-Jt6ykn_yZKi@mail.gmail.com>
Subject: Re: Capacity problem with a lot of writes?
From: Carlos Alvarez <cbalvarez@gmail.com>
To: user@cassandra.apache.org
Content-Type: text/plain; charset=ISO-8859-1

On Fri, Nov 26, 2010 at 1:34 PM, Edward Capriolo <edlinuxguru@gmail.com> wrote:
> I believe there is room for other compaction models. I am interested
> in systems that can optimize the case with multiple data directories
> for example. It seems like from my experiment a major compaction can
> not fully utilize hardware is specific conditions. Although knowing
> which ones to use where and how to automatically select the optimal
> strategy are interesting concerns.

Thank you for sharing your technique.

I also think that a diferent model of compaction could be useful, esp
in situations when the normal and nice compaction (the one which gives
place to read/write to ocurr) is not enough to recover or when you
have small windows of low activity with a lot of unused resources in
the cluster.


Carlos.