Is there a tool for generating a Cassandra model from a MySQL database?
The whole point of NoSQL is that it doesn't use the same type of datastructures as an SQL database. It requires a whole different way of thinking and approach with your app, so there isn't something to handily copy the schema over because it is going to be unique to your solution.
You could at least try CQL. It attempts to imitate SQL, with many limitations though, as it has to fit with Cassandra characteristics as set by JamesRyan