I've Cassandra configured on Amazon EC2 having 3 nodes(instances) in single cluster. Now what I want to do is give some space on Cassandra to my clients by creating separate keyspace for each in a single cluster. Number of clients will increase day by day so there is no fix number of keyspaces I can assume to be created.

Will there be a performance issue if I create too many keyspaces in single cluster?

If it's not good practice, then Is there any other workaround to fit my need? I don't want to configure multiple instances of Cassandra.

If Cassandra is not the right choice for this kind of architecture, any other NoSQL database which fits my needs and How?

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