Hive on Tez disabling session mode

I’d like to disable session mode for Tez. I tried to set tez.am.container.reuse and tez.am.mode.session to false on Ambari, but no luck. I still get this line in the container’s syslog: INFO [main] app.DAGAppMaster: In Session mode. Waiting for DAG over RPC
Is it possible to disable session mode?

thanks!