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From Kai Wang <>
Subject Re: Keyspace and table/cf limits
Date Sat, 06 Dec 2014 02:39:19 GMT
On Fri, Dec 5, 2014 at 4:32 PM, Robert Coli <> wrote:

> On Wed, Dec 3, 2014 at 1:54 PM, Raj N <> wrote:
>> The question is more from a multi-tenancy point of view. We wanted to see
>> if we can have a keyspace per client. Each keyspace may have 50 column
>> families, but if we have 200 clients, that would be 10,000 column families.
>> Do you think that's reasonable to support? I know that key cache capacity
>> is reserved in heap still. Any plans to move it off-heap?
> That's an order of magnitude more CFs than I would want to try to operate.
> But then, I wouldn't want to operate Cassandra multi-tenant AT ALL, so
> grain of salt.
> =Rob
I don't know if it's still true but Jonathan Ellis wrote in an old post
saying there's a fixed overhead per cf. Here is the link. Even if it's improved since C* 1.0, I
still don't feel comfortable to scale my system by creating CFs.

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