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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