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2012-02-17T23:36:03.343
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2012-02-20T19:50:45.277
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2017-05-23T12:29:35.723
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You can have distributed consistency (for a single operation) without transactions, but not atomicity (for groups of operations). Although 'consistency' in Cassandra is used in a slightly more specific sense than for <a href="http://en.wikipedia.org/wiki/ACID" rel="nofollow noreferrer">ACID</a> databases in general. Cassandra supports tunable consistency levels (CLs) - you can specify the consistency level for each read and write. See <a href="http://wiki.apache.org/cassandra/API" rel="nofollow noreferrer">http://wiki.apache.org/cassandra/API</a>. These levels range from <code>CL.ANY</code> (which reads or writes from/to a single node, initially) to <code>CL.ALL</code> (which gives you full consistency, at the expense of availability). However, it doesn't give you a way to group operations into atomic transactions so they all succeed or all fail (though I think multiple operations on the same row are atomic, but not independent). See also: <ul> <li><a href="https://stackoverflow.com/questions/2976932/cassandra-transaction-support">Cassandra - transaction support</a></li> <li><a href="http://ria101.wordpress.com/2010/05/12/locking-and-transactions-over-cassandra-using-cages/" rel="nofollow noreferrer">Locking and transactions over Cassandra using Cages</a></li> <li><a href="http://cassandra-user-incubator-apache-org.3065146.n2.nabble.com/best-practices-for-simulating-transactions-in-Cassandra-td7064256.html" rel="nofollow noreferrer">Best practices for simulating transactions in Cassandra</a></li> </ul>
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