What is Apache Cassandra -No sql

What is Apache Cassandra?

   Its a no sql database which is mainly used to storing Big data. It famous for its Fault tolerance ,scalability, availability and Performance. Its used by Facebook ,ebay , Go-daddy and other popular companies.

   One of the largest production deployments consists of over 15,000 nodes storing over 4 PB of data. Other large Cassandra installations include Netflix (2,500 nodes, 420 TB, over 1 trillion requests per day), Chinese search engine Easou (270 nodes, 300 TB, over 800 million reqests per day), and eBay (over 100 nodes, 250 TB).   

For more Info -- http://cassandra.apache.org/