Welcome to Apache Cassandra

The Apache Cassandra database is the right choice when you need scalability and high availability without compromising performance. Linear scalability and proven fault-tolerance on commodity hardware or cloud infrastructure make it the perfect platform for mission-critical data. Cassandra's support for replicating across multiple datacenters is best-in-class, providing lower latency for your users and the peace of mind of knowing that you can survive regional outages.

Cassandra's data model offers the convenience of column indexes with the performance of log-structured updates, strong support for denormalization and materialized views, and powerful built-in caching.


The latest release is 2.0.7 (Changes)

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  • You're in Control

    Choose between synchronous or asynchronous replication for each update. Highly available asynchronous operations are optimized with features like Hinted Handoff and Read Repair.

  • Elastic

    Read and write throughput both increase linearly as new machines are added, with no downtime or interruption to applications.

  • Professionally Supported

    Cassandra support contracts and services are available from third parties.

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Mailing Lists


Many of the Cassandra developers and community members hang out in the #cassandra channel on irc.freenode.net.

If you are new to IRC, you can use a web-based client.

Dead Trees