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From Alain RODRIGUEZ <>
Subject Re: Creating column families per client
Date Wed, 21 Dec 2011 14:08:51 GMT
Hi, I don't know if this will be technically possible, but I just want to
warn you about creating a lot of column families. When you will have a lot
clients, you will have a lot of column families and, if I'm right, each
column family uses memory on every node. You will run out of memory very
fast, because of the non horizontal growth of the memory usage per column
family (adding nodes won't resolve the problem, you will have to upgrade
hardware on existing nodes, which is not Cassandra's philosophy).

I think you should use rows or columns inside your column families as much
as possible unless you have really a few clients.

Once again, I'm not a Cassandra expert. I might be wrong :-).


2011/12/21 Rafael Almeida <>

> Hello,
> I am evaluating the usage of cassandra for my system. I will have several
> clients who won't share data with each other. My idea is to create one
> column family per client. When a new client comes in and adds data to the
> system, I'd like to create a column family dynamically. Is that reliable?
> Can I create a column family on a node and imediately add new data on that
> column family and be confident that the data added will eventually become
> visible to a read?
> []'s
> Rafael

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