Github user zjffdu commented on the issue: https://github.com/apache/zeppelin/pull/2443 This PR LGTM. Just one comment on the base class `KerberosInterpreter`. I think `startKerberosLoginThread` and `shutdownExecutorService` should be called in `KerberosInterpreter`'s open and close method rather than ask the sub class to call them. The sub class should only implement 2 abstract classes: * isKerboseEnabled * runKerberosLogin Which means ``` public void open() { if (isKerboseEnabled()) { startKerberosLoginThread() } } public void close() { if (isKerboseEnabled()) { shutdownExecutorService() } } ```
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