Is Datastax Cassandra the only available Cassandra that can be used in a production environment? Is there any free alternatives available? What about the cassandra available on Apache site?
Datastax is a commercial company, who supports C*. The base source code of Cassandra is taken of the Apache Repositories, then some of their own code is merged. Besides this, as already mentioned by others, Datastax version comes with some additional tools for maintaining a Cassandra Cluster.
Datastax provides some advanced features in the Enterprise version that Apache Cassandra lacks. For instance, security & advanced tools such as OpsCenter are missing in Cassandra. These can be a welcome addition to the open-source Apache Cassandra.
Netflix still uses Cassandra today, but not only for its scalability and rock-solid reliability. Its performance is key to the streaming media company – Cassandra runs 30 million operations per second on its most active single cluster, and 98% of the company's streaming data is stored on Cassandra.
Though Facebook has all but abandoned Cassandra, the technology has gone on to power critical web infrastructure at companies like Twitter, Netflix, even Apple. And DataStax has built a version of the tool for all sorts of other businesses.
Datastax Community Edition is also free, it contains a basic version of OpsCenter -- http://planetcassandra.org/cassandra/
Here is the difference between the community edition and DSE
http://www.datastax.com/download/dse-vs-dsc
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