For anyone revisiting this at a later point, the issue was that Spark 2.1.0 upgrades netty to version 4.0.42 which is not binary compatible with version 4.0.37 used by version 3.1.0 of the Cassandra Java Driver. The newer version can work with Cassandra, but because of differences in the maven artifacts (Spark depends on netty-all while Cassandra depends on netty-transport) this was not automatically resolved by SBT. Adding an explicit dependency to netty-transport version 4.0.42 solved the problem.
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