Impersonate spark interpreter - front end user process triggers proxy-pass

Impersonate user for the spark interpreter require to setup HDFS hadoop.proxyuser.<USER>.hosts property to work.
The interpreter is started as the front-end user (with the --proxy-pass command) which is not correct.

Either start it with as zeppelin with --proxy-pass (which is the best solution to avoid the hdfs proxy user config for each front end users).
Either start it as the front-end user without the --proxy-pass.