Github user witgo commented on the pull request:
https://github.com/apache/spark/pull/921#issuecomment-44719589
@sryza
When `yarnAllocator.getNumExecutorsFailed` return value is greater than
zero .
`yarnAllocator.getNumExecutorsRunning < args.numExecutors` is true forever
.
That is to say,In this case,only expression `userThread.isAlive` or
`!driverClosed` is false, `ExecutorLauncher.launchReporterThread` will execute
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