Github user prabhjyotsingh commented on the issue:
https://github.com/apache/zeppelin/pull/2407
@felixcheung have handled your review comments, except
https://github.com/apache/zeppelin/pull/2407#discussion_r122361683 as
KERBEROS_REFRESH_INTERVAL is configurable and is documented
[here](https://github.com/apache/zeppelin/pull/2407/files#diff-5a017ebfb7e890a2b475f9c8c7844fb0R71)
as well.
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