Github user DrIgor commented on the issue:
https://github.com/apache/zeppelin/pull/2039
@felixcheung `terminate` flag is shared across several threads and is
accessed without any synchronization.
And we don't need to implement custom interruption flag because java
already has it â `Thread.interrupt`
Standard flag is even better, because it can interrupt `Thread.sleep`.
This PR doesn't change any logic, it just replaces `terminate` with
`Thread.interrupted()` and provides proper handling of `InterruptedException`
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