Github user echarles commented on the issue: https://github.com/apache/zeppelin/pull/1322 Whatever `su` or `ssh` is used, I feel the main trick is the user provisioning on the host running the interpreter. Until now, the shiro authentication system had no impact on the user provisioning. This PR changes this. I guess we all agree and are aware that adding user `foo` to shiro.ini, and enabling impersonation, will require to run `adduser foo` manually. We should make this clear in the doc but also stress it in the UI (with a hover, or a clear text/link near the <checkbox> User Impersonate.
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