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 meatforums@gmail.com designates
 209.85.216.179 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=rU32fsva+IMDqj/Zrpit0UvO398YeQoB4QsiSCT/jcCN5khToaKc5SUXEsaUaK1Bnc
         Js6qiEiHy52lARzLDKUCVDIfdFWcQGOp2gHegixLVefClSyx3VxfqhW3K7VsQwxG3Xr5
         fL99tHgRKy8uKkwgOe8fBAYLekWHsZ1AsJhPU=
MIME-Version: 1.0
In-Reply-To: <4E01073B.6090200@dude.podzone.net>
References: <4E00D52A.6040409@dude.podzone.net>
	<BANLkTinnENBJYPRNJLn-mXVh=ALqQyOZ0Q@mail.gmail.com>
	<BANLkTik+awbYc7b1REprjRC=mT4nazd1XA@mail.gmail.com>
	<BANLkTi=4Eq-=Sfmg+Ny4FckyVRwR+Qx1sQ@mail.gmail.com>
	<4E01073B.6090200@dude.podzone.net>
Date: Tue, 21 Jun 2011 14:14:19 -0700
Message-ID: <BANLkTikhOEmrcWvnTngtrt2ixsK9Q_kXrw@mail.gmail.com>
Subject: Re: Storing Accounting Data
From: Anand Somani <meatforums@gmail.com>
To: user@cassandra.apache.org
Content-Type: multipart/alternative; boundary=00248c70feb5cf1b9004a63f55b6

--00248c70feb5cf1b9004a63f55b6
Content-Type: text/plain; charset=ISO-8859-1

Not sure if it is that simple, a quorum can fail with writes happening on
some nodes (there is no rollback). Also there is no concept of atomic
compare-and-swap.

On Tue, Jun 21, 2011 at 2:03 PM, AJ <aj@dude.podzone.net> wrote:

> **
> On 6/21/2011 2:50 PM, Stephen Connolly wrote:
>
> how important are things like transactional consistency for you?
>
> would you have issues if only one side of a transfer was recorded?
>
>
> Right.  Both of those questions are about consistency.  Isn't the simple
> solution is to use QUORUM read/writes?
>
>  cassandra, out of the box, on it's own, would not be ideal if the above
> two things are important for you.
>
> you can add components to a system to help address these things, eg
> zookeeper, etc. a reason why you moght do this is if you already use
> cassandra in your app and are trying to limit the number of databases
>
> - Stephen
>
> ---
> Sent from my Android phone, so random spelling mistakes, random nonsense
> words and other nonsense are a direct result of using swype to type on the
> screen
> On 21 Jun 2011 18:30, "AJ" <aj@dude.podzone.net> wrote:
>
>
>

--00248c70feb5cf1b9004a63f55b6
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

Not sure if it is that simple, a quorum can fail with writes happening on s=
ome nodes (there is no rollback). Also there is no concept of atomic compar=
e-and-swap.<br><br><div class=3D"gmail_quote">On Tue, Jun 21, 2011 at 2:03 =
PM, AJ <span dir=3D"ltr">&lt;<a href=3D"mailto:aj@dude.podzone.net">aj@dude=
.podzone.net</a>&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin: 0pt 0pt 0pt 0.8ex; borde=
r-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"><u></u>

 =20
   =20
 =20
  <div bgcolor=3D"#ffffff" text=3D"#000000"><div class=3D"im">
    On 6/21/2011 2:50 PM, Stephen Connolly wrote:
    <blockquote type=3D"cite">
      <p>how important are things like transactional consistency for
        you?</p>
      <p>would you have issues if only one side of a transfer was
        recorded?</p>
    </blockquote>
    <br></div>
    Right.=A0 Both of those questions are about consistency.=A0 Isn&#39;t t=
he
    simple solution is to use QUORUM read/writes?=A0 <br><div class=3D"im">
    <br>
    <blockquote type=3D"cite">
      <p>cassandra, out of the box, on it&#39;s own, would not be ideal if
        the above two things are important for you.</p>
      <p>you can add components to a system to help address these
        things, eg zookeeper, etc. a reason why you moght do this is if
        you already use cassandra in your app and are trying to limit
        the number of databases</p>
      <p>- Stephen</p>
      <p>---<br>
        Sent from my Android phone, so random spelling mistakes, random
        nonsense words and other nonsense are a direct result of using
        swype to type on the screen</p>
      <div class=3D"gmail_quote">On 21 Jun 2011 18:30, &quot;AJ&quot; &lt;<=
a href=3D"mailto:aj@dude.podzone.net" target=3D"_blank">aj@dude.podzone.net=
</a>&gt;
        wrote:<br type=3D"attribution">
      </div>
    </blockquote>
    <br>
  </div></div>

</blockquote></div><br>

--00248c70feb5cf1b9004a63f55b6--