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: local policy)
DomainKey-Signature: a=rsa-sha1; c=nofws; d=thelastpickle.com; h=content-type
	:mime-version:subject:from:in-reply-to:date
	:content-transfer-encoding:message-id:references:to; q=dns; s=
	thelastpickle.com; b=YozdnBr53fuMrXytxS+rrgrQvLAzNGXUhCA5JdafzuX
	gi6CRCRfKPA/Og1kyjnSnp4td4yb+TFVQ+9zrwdogcl+jlMOtTKYSPXHoUOlMUQd
	lDKhCecc2X9AUEj/rM+P8nqU5nFU/6McOgdq3hg3V/3QMEWGz3CzR6pVQRn7DDLY
	=
Content-Type: text/plain; charset=iso-8859-1
Mime-Version: 1.0 (Apple Message framework v1244.3)
Subject: Re: CL=N-1?
From: aaron morton <aaron@thelastpickle.com>
In-Reply-To: 
 <CAAnh3__0gYx8ZQLeNykDDdq1OGj+k=tBqRr9BJSOm8mnYu3HJw@mail.gmail.com>
Date: Mon, 25 Jul 2011 10:25:44 +1200
Content-Transfer-Encoding: quoted-printable
Message-Id: <DFAD55B9-4160-4FA8-94F5-2B9F3F22B02D@thelastpickle.com>
References: 
 <CAAnh3__0gYx8ZQLeNykDDdq1OGj+k=tBqRr9BJSOm8mnYu3HJw@mail.gmail.com>
To: user@cassandra.apache.org

Sounds like you want RF =3D=3D N more than CL =3D=3D N-1. You could =
create a separate KS with RF =3D=3D N and then just write at CL =3D =
QUORUM, the write will be sent to every UP replica.=20

For background: The System Keyspace uses the o.a.c.locator.LocalStrategy =
that *only* stores data on the node the mutation is sent to. So there is =
*no replication*, the system takes care of ensuring data that needs to =
be replicated (i.e. schema defs) are replicated via  higher level =
features. Using the LocalStrategy yourself is probably a bad idea.=20

Cheers

-----------------
Aaron Morton
Freelance Cassandra Developer
@aaronmorton
http://www.thelastpickle.com

On 23 Jul 2011, at 07:24, Yang wrote:

> is there such an option?
>=20
> in some cases I want to distribute some small lookup tables to all the
> nodes, so that everyone has a local copy, and loaded in memory. so the
> lookup is fast. supposedly I want to write to all N nodes, but that
> exposes me to failure in case of just one node down.
> so I'd like to declare success to N-1 nodes.
>=20
> thanks
> Yang