@nlewis135031    We remove livy.spark.master in zeppelin-0.7. Because we suggest user to use livy 0.3 in zeppelin-0.7. And livy 0.3 don't allow to specify livy.spark.master by default, it enforce yarn-cluster mode refer here. As you aware always to have yarn-cluster mode is better after all using the cluster resource is wise. yarn-cluster mode --> you can't directly mention yarn-cluster as master option ( in HDP 2.6.x i guess - i tested in HDP 2.6.3) instead you can use the workaround below to use the yarn cluster mode. this option is available from 0.8.0 jira. master yarn spark.submit.deployMode cluster   Hope this helps! ... View more