Github user zjffdu commented on the issue:
https://github.com/apache/zeppelin/pull/2407
@prabhjyotsingh @felixcheung I thought about this again. I don't have
concern on this PR, but have concern on how user should interact with shell
interpreter interpreter. I think the shell interpreter should behave as close
as bash terminal of linux. That means the user should call `kinit` if he want
to run shell command in kerberized cluster just as he did in linux shell
terminal. For now, the shell interpreter of zeppelin share the same
keytab/principal for all users even when in isolated and impersonated mode
which is a big security hole.
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