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From: "Dop Sun" <sunht@dopsun.com>
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Subject: RE: How many KeySpace will you use in a single application?
Date: Sat, 10 Apr 2010 21:14:53 +0800
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Thanks, I note it down.

-----Original Message-----
From: Jonathan Ellis [mailto:jbellis@gmail.com]=20
Sent: Saturday, April 10, 2010 9:10 PM
To: user@cassandra.apache.org
Subject: Re: How many KeySpace will you use in a single application?

Yes, one keyspace per app is the normal way to design things.

On Fri, Apr 9, 2010 at 11:17 PM, Dop Sun <sunht@dopsun.com> wrote:
> Hi, a question troubles me now: how many KeySpaces one application is
better
> to use?
>
>
>
> The question is coming out since 0.6, Cassandra introduced a new API =
named
> as =93login=94, which is done against a specific keySpace. Thanks to =
the
> org.apache.cassandra.auth.AllowAllAuthenticator, the old version =
clients
can
> still work without authentication.
>
>
>
> Actually, while I=92m working with the previous version, I just take =
the
> KeySpace as another level of the whole structure, KeySpace =96 =
ColumnFamily
=96
> Super Column (optional) =96 Column =96 Value. =A0And consider the =
whole
Cassandra
> cluster as the root of all these, and one application controls =
everything
> under this cluster.
>
>
>
> Now, looks like I need to re-think this and put the KeySpace as a kind =
of
> root. It may be better to make one application only takes one KeySpace =
(a
> silly question? Since all old time, one application usually uses only =
one
> database, but forgive me, I may abuses the flexibility of Cassandra.)? =
Is
> there any pros or cons to user multiple key spaces vs. single key =
spaces,
> other than the authentication requirements?
>
>
>
> Can anyone give me some suggestions on this?
>
>
>
> Dop