Github user zjffdu commented on the issue:
https://github.com/apache/zeppelin/pull/1840
@khalidhuseynov Have you try it in secured cluster ? IIRC, `--proxy-user`
can not work with `--principal` & `--keytab` together, that means in secured
cluster, user have to run `kinit` instead of using `--principal` & `--keytab'.
This might not be user expect.
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