One size doesn't fit all. MySQL and Cassandra are radically different system in both the query model and distribution models. Cassandra and HBase are similar in

One size doesn't fit all. MySQL and Cassandra are radically different system in both the query model and distribution models. Cassandra and HBase are similar in the data models (the differences are mandated by their respective distribution models), but are radically different in their distribution models. Entirely different systems are suited for entirely different applications.