Missing CentOS7 RPM: MariaDB-10.1.16-centos7-x86_64-cassandra-engine.rpm?
It appears the rpm for the Cassandra storage engine is not available in your repository for centos7 or rhel7. The package exist in in centos 6 repository but not 7, is this on purpose? Is the Cassandra storage engine supported on CentOS7?
Example of Cassandra storage engine rpm in the CentOS6 repo: http://yum.mariadb.org/10.1/centos6-amd64/rpms/
Example of the CentOS7 repo not containing the Cassandra storage engine rpm: http://yum.mariadb.org/10.1/centos7-amd64/rpms/
Answer Answered by Ian Gilfillan in this comment.
Development on Cassandra SE appears to have stopped. See MDEV-4695.