I use Titan 0.4.0 All, running Rexster in shared VM mode on Ubuntu 12.04.
How could I properly delete a graph in Titan which is using the Cassandra storage backend?
Just to update this answer.
With Titan 1.0.0 this can be done programmatically in Java with:
Titan 1.0.0
TitanGraph graph = TitanFactory.open(config); graph.close(); TitanCleanup.clear(graph);