Github user smallyard commented on the issue:
https://github.com/apache/spark/pull/15794
@AmplabJenkins
Sorry, the patch don't fix this bug.
ApplicationMaster has some problem.
```
mainMethod.invoke(null, userArgs.toArray)
finish(FinalApplicationStatus.SUCCEEDED, ApplicationMaster.EXIT_SUCCESS)
```
main method was finished, but sub thread may be not finished.
so should not invoke finish to shutdown dirver thread.
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