Github user XuTingjun commented on the pull request:
https://github.com/apache/spark/pull/9288#issuecomment-156078546
@andrewor14, yeah the ```DAGScheduler``` post events from a single thread,
but the root cause is that ```DAGScheduler``` receive the
```SparkListenerTaskEnd``` behind ```SparkListenerStageCompleted```.
I try to resolve the root cause, as you said scheduler is quite
complicated, my realization caused many unit tests failed. So if you OK with
doing a fix on the ```ExecutorAllocationManager``` side, I will fix update the
```ExecutorAllocationManager``` code.
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