6.Cassandra

Apache Cassandra is an open source distributed DBMS, which is a top-level project of the Apache Software Foundation. It is designed to handle very large amounts of data spread across many commodity servers. It provides a highly available service, which has architecture to prevent single point of failure. Apache Cassandra was developed at Facebook. In guly 200U, it was distributed as an open source project on Google Code, while in March 2009, it was an Apache Incubator project and then released as a top-level project.

Cassandra provides a structured key-value store, where each node in the cluster has the same role. Data is distributed across the cluster, and each node can serve any request. It supports multi-data-centre replication for redundancy and disaster recovery. Data is automatically replicated to multiple nodes for fault-tolerance. It can be easily integrated with Hadoop with Mapoeduce support. Apache mig and Apache Hive integration is also supported. There is also an SnL-like alternative called