@kayousterhout I don't believe that this delayed start tactic is needed anymore after https://github.com/apache/spark/commit/0b448df6ac520a7977b1eb51e8c55e33f3fd2da8#diff-6a9ff7fb74fd490a50462d45db2d5e11 since there is no more scheduled `resubmissionTask` -- meaning that we can go back to creating `eventProcessActor` (and now its supervisor) in the `DAGScheduler` constructor, and that the `NOTE:` in the preceeding comment is out of date.