Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/7846#issuecomment-126897483
If you're asking what I mean, I mean that the monitor thread itself can
have the flag, like `isMonitoring`, that is `true` when it starts the blocking
call to `monitorApplication` and `false` immediately after. Then expose another
method like `stop()` or something, that interrupts the thread only if
`isMonitoring` is true. This means that if the thread itself initiates
`sc.stop()`, it won't get interrupted, but can still be interrupted in the
blocking call to the library method.
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