Github user FireArrow commented on the issue:
https://github.com/apache/zeppelin/pull/2034
I think restart from settings in the table above should have the same
behavior as edit+save. The settings page is generally considered an
administrative function, and as long as there is a central page for the
settings I think the only reasonable behavior would be to apply it to all
users, impersonate or not.
That being said, I agree that terminating is a good fix for now. In our
environment we actually have a script that kills of all lingering sessions on
zeppelin restart, because they don't terminate on their own (and I'm pretty
sure it's related to what is discussed here)
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