Setup and configuration of JanusGraph for a Spark cluster and Cassandra
Try fixing these properties:
janusgraphmr.ioformat.conf.storage.keyspace=janusgraphstorage.keyspace=janusgraphReplace with:
janusgraphmr.ioformat.conf.storage.cassandra.keyspace=janusgraphstorage.cassandra.keyspace=janusgraphThe default keyspace name is janusgraph, so despite the mistakes on the property names, I don't think you would have observed that problem unless you loaded your data using a different keyspace name.
The latter property is described in the Configuration Reference. Also, keep an eye on this open issue to improve the docs for Hadoop-Graph usage.