The Cassandra table dse_system.real_leaders used to be populated with the Spark master ip address. This does not seem to be the case with dse 5.0.3. Is there a new way to find the master through a Cassandra query? Perhaps my dse environment is not configured correctly to populate the real_leaders table?
I would try the following cqlsh> call DseClientTool.getSparkMasterAddress () ;