Cassandra

* Structured data
* Fast write
* Distributed - Can run of more than 2 nodes
* Column oriented database not like mysql(row oriented database)
* Good for very high volume of data

DynamoDB(amazon was) and HBase are also  column base data store.

- Consistency
- Availability
- Partition Tolerance

Install on ubuntu 12.04

http://www.datastax.com/download

Download and untar.