It was built by Facebook for their services upon principles developed by Google and Amazon for BigTable and Dynamo.
Apache Cassandra is currently developed by Apache.
Cassandra is extremely fast, even with million of records and operations.
It is currently used in many Internet companies like Rackspace, Spotify, Netflix, RockMelt, Embedly, Ericcson, Expedia, FormSpring, Adobe, Twitter, Cisco, Digg, Mollom, Digital River, Page2RSS, Real, Reddit, eBuddy, EngineYard, Symantec, Soundcloud, Accenture, Rhapsody, Gowalla, HP, IBM, Mahalo, Walmart, OpenX and others.
Here are some key features of "Apache Cassandra":
· Professionally Supported
· Rich Data Model
· Fault Tolerant
· Cluster and Cloud Friendly
· Documentation and Tutorials
What's New in This Release: [ read full changelog ]
· Disallow counters in collections.
· cqlsh: added unit tests.
· Fixed default bloom_filter_fp_chance for LeveledCompactionStrategy.