Github user zsxwing commented on the pull request:
https://github.com/apache/spark/pull/7276#issuecomment-121097747
> My high-level comment / question: why not use the existing submitJob that
returns a SimpleFutureAction rather than defining your own asynchronous version
of that method?
The problem of `SimpleFutureAction` is its `onComplete` calls
`awaitResult`. So if using `SimpleFutureAction`, each Job needs to block one
thread. It means each running `Receiver` needs one thread in the driver. It
may exhaust threads.
```
override def onComplete[U](func: (Try[T]) => U)(implicit executor:
ExecutionContext) {
executor.execute(new Runnable {
override def run() {
func(awaitResult())
}
})
}
```
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