Cassandra is an open source scalable and highly available “NoSQL” distributed database management system from Apache. Cassandra claims to offer fault tolerant linear scalability with no single point of failure. Cassandra sits in the Column-Family NoSQL camp. The Cassandra data model is designed for large scale distributed data and trades ACID compliant data practices for performance and availability. Cassandra is optimized for very fast and highly available writes. Cassandra is written in Java and can run on a vast array of operating systems and platform.