Github user khalidhuseynov commented on the issue:
https://github.com/apache/zeppelin/pull/1840
@zjffdu i didn't try secured cluster mode yet, but as i checked spark
documentation, they indeed don't allow using `--principal` & `--keytab` for
spark-submit alongside with `--proxy-user` because of security issue on
exposing keytab. Then possible solutions could be:
1. user configures `export ZEPPELIN_IMPERSONATE_CMD` in
[here](https://github.com/apache/zeppelin/blob/d1fc86b7b2d2012c0323345166c98cc02886e9f1/conf/zeppelin-env.sh.template#L83)
with `kinit <principal>@<REALM> -k -t <keytab file>` and then it's run before
`spark-submit`
2. don't use `--proxy-user` in cluster mode
3. other suggestions
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