You can apparently invoke a level of synchronous behavior in MongoDB with the getLastError command: http://www.mongodb.org/display/DOCS/getLastError+Command htt

You can apparently invoke a level of synchronous behavior in MongoDB with the getLastError command: http://www.mongodb.org/display/DOCS/getLastError+Command http://www.mongodb.org/display/DOCS/getLastError+Command Conceptually, its abilities look a lot like Cassandra's "configurable consistency" model.