Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/5343#issuecomment-107672875
@piaozhexiu Echoing others' comments, I don't think we should tie the fate
of the submission client to that of the AM. If fire-and-forget mode is enabled
(i.e. `spark.yarn.submit.waitAppCompletion` is false), then this option kills
your application immediately without allowing it to run. IMO it makes more
sense for the AM to exit when the SparkContext exits as it currently does today.
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