Github user mattyb149 commented on the issue:
https://github.com/apache/nifi/pull/2188
+1 LGTM, ran unit tests and contrib-check, verified NiFi flows against
Cassandra 2.1.19 and 3.11.0, also verified the [protocol support
matrix](http://docs.datastax.com/en/developer/java-driver/3.3/manual/native_protocol/)
and [version support
matrix](https://docs.datastax.com/en/developer/driver-matrix/doc/javaDrivers.html)
do not introduce any issues with supported versions. Thanks for the upgrade!
Merging to master
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