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From "Dop Sun" <>
Subject RE: How many KeySpace will you use in a single application?
Date Sat, 10 Apr 2010 13:14:53 GMT
Thanks, I note it down.

-----Original Message-----
From: Jonathan Ellis [] 
Sent: Saturday, April 10, 2010 9:10 PM
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 <> wrote:
> Hi, a question troubles me now: how many KeySpaces one application is
> 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
> 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
> 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

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