Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/3143#issuecomment-62210611
I'm not too familiar with the YARN code, but it looks like the `Client` has
a `monitorApplication()` method that blocks until the application completes and
returns its status. To avoid code duplication / improve understandability,
couldn't we spin off a thread that calls that method (since that already
implements the polling logic) and calls `sc.stop()` once that method returns?
I think `sc.stop()` is thread-safe (or can be).
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