I honestly think Cassandra is one to two years ahead of the competition, but I’m under no illusions that Cassandra itself is perfect.
You cannot start the year without taking a stab at your competitors. At least from the performance point of view and even if they’re not really competitors—MongoDB, Riak, HBase.
The NoSQL market is ant-size compared to the database market and while easier to convince people to change from NoSQL to NoSQL, the products that will thrive are those that will be able to constantly convert people from outside of this small universe.
Original title and link: Cassandra Performance in Review ( ©myNoSQL)