Facebook released Cassandra, its NoSQL, big data distributed data store to open source. It can power massive data sets quickly and reliably without compromising performance. Different new features and improvements are included in the latest version. To know more about Cassandra 2.0, follow Steven J. Vaughan-Nichols's, article link:
http://www.zdnet.com/cassandra-2-0-the-next-generation-of-big-data-7000020237/