RE: How many KeySpace will you use in a single application?

[Dop Sun]

Thanks, I note it down.

-----Original Message-----
From: Jonathan Ellis [mailto:jbel...@gmail.com] 
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 <su...@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 “login”, 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’m working with the previous version, I just take the
> KeySpace as another level of the whole structure, KeySpace – ColumnFamily
–
> Super Column (optional) – Column – Value.  And 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