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Key features of Cassandra’s distributed architecture are specifically tailored for multiple-data center deployment, for redundancy, for failover and disaster recovery. Cassandra is designed as a distributed system, for deployment of large numbers of nodes across multiple data centers. Supports replication and multi data center replication Replication strategies are configurable. Data is distributed across the cluster (so each node contains different data), but there is no master as every node can service any request. Main features Distributed Every node in the cluster has the same role. Older version, yet still maintained: 3.11

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3.11 released Jas a stable 3.11 release series and bug fix from the last tick-tock feature release.

3.1 through 3.10 releases were monthly releases using a tick-tock-like release model, with even-numbered releases providing both new features and bug fixes while odd-numbered releases will include bug fixes only.

2.0, released Sep 4 2013, added lightweight transactions (based on the Paxos consensus protocol), triggers, improved compactions.

1.2, released Jan 2 2013, added clustering across virtual nodes, inter-node communication, atomic batches, and request tracing.

1.1, released Apr 23 2012, added self-tuning caches, row-level isolation, and support for mixed ssd/spinning disk deployments.

1.0, released Oct 17 2011, added integrated compression, leveled compaction, and improved read-performance.

0.8, released Jun 2 2011, added the Cassandra Query Language (CQL), self-tuning memtables, and support for zero-downtime upgrades.

0.7, released Jan 08 2011, added secondary indexes and online schema changes.

0.6, released Apr 12 2010, added support for integrated caching, and Apache Hadoop MapReduce.įacebook developers named their database after the Trojan mythological prophet Cassandra, with classical allusions to a curse on an oracle. On Februit graduated to a top-level project. In March 2009 it became an Apache Incubator project.

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Facebook released Cassandra as an open-source project on Google code in July 2008. Avinash Lakshman, one of the authors of Amazon's Dynamo, and Prashant Malik initially developed Cassandra at Facebook to power the Facebook inbox search feature.