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From Sylvain Lebresne <>
Subject Re: Multiple keyspaces per application?
Date Tue, 27 Apr 2010 16:27:10 GMT
I think the idea behind this sentence in storage-conf.xml is just to
say that, unless you're
doing something specific (like not have the same replication factor
for all your data), there
is no reason you would want more than one keyspace by application.

As for disadvantages, you may want to know that in the next cassandra
release (the 0.7 one),
a login will be introduced. With that, the choice of the keyspace will
move from every request
(as it is right now) to the login part. The following request will
then use the keyspace set at login.
It may make it a little bit more painful to use multiple keyspace in
the same application, so that
may be one reason why not to unless you have good reason.


On Tue, Apr 27, 2010 at 3:57 PM, David Boxenhorn <> wrote:
> I just saw this note from storage-conf.xml:
> "Except in very unusual circumstances you will have one Keyspace per
> application."
> Why is that?
> I was thinking of putting our "normal data" and "indexes" in separate
> keyspaces so they could be maintained separately.
> What are the disadvantages of multiple keyspaces?

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