Github user rconline commented on the issue:
https://github.com/apache/zeppelin/pull/1236
@felixcheung i think this will continue to remain a problem, till the time
we allow all user roles to setup/modify these permissions. Unless we can
recognize and separate this as an admin (superuser) action, this seems okay to
me. There will be cases when the LDAP user id's will end up in zeppelin/POSIX
systems as 'a1890xx', based upon conversion rules, when users who setup these
permissions will find it very hard to use. Hence for now, showing all users is
a reasonable approach.
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