Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/9946#issuecomment-173415101
> a YARN that doesn't stop it is doing something wrong
But that's the case. It's a bug in YARN. See
https://issues.apache.org/jira/browse/HADOOP-12441.
> some app's cleanup fails not infrequently in an inconsistent state since
it was immediately halted
If the app fails in that way, *it is broken*. The cleanup should be done
before the driver's {{main()}} returns; otherwise, the app has relinquished
control back to Spark / the cluster manager, and anything can happen.
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