Github user DrIgor commented on the issue:
https://github.com/apache/zeppelin/pull/2039
`interrupt` just sets `Thread.isInterrupted` flag and does not immediately
stop the thread. Then thread can check this flag and decide if it needs to
stop. So in fact, termination logic remains the same.
Maybe you mixed up `Thread.interrupt` and `Thread.stop` methods?
`Thread.stop` terminates a thread without graceful shutdown, `Thread.interrupt`
doesn't.
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