A system called "Cages" has just been released. Where needed, you can use Cages to apply locking and soon transactions over sequences of Cassandra operations.
There is a post explaining how Cages can be used with Cassandra here: http://ria101.wordpress.com/2010/05/12/locking-and-transactions-over-cassandra-using-cages/ You can find more information about Cages here: http://cages.googlecode.com/ Best, Dominic Williams
