Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/9288#issuecomment-155604261
It's unclear how the wrong ordering resulted because `DAGScheduler`
supposably posts events from a single thread. I think investigating this will
take much longer since the scheduler is quite complicated. I'm OK with doing a
fix on the `ExecutorAllocationManager` side.
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