> Is it possible to restrict users to specific DC in cassandra,  let's say an 
> user A is connecting to DC1 and executing queries, how to can I restrict that 
> user to that particular DC...

This part sounds like a job for a DC-aware load-balancing policy in the driver.

> ... just in case even he change his contact points he shouldn't be able 
> execute queries on DC2.

This part confuses me. What problem are you trying to solve? Are you
concerned about a DC getting hit with more requests than you'd like
because of a misconfigured driver?

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