Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/3779#issuecomment-72597256
I took a pass through this, but I'll admit that I'm a little out of my
depth w.r.t. scheduler internals here. I think that I understand the goals /
invariants of the scheduler at a high level, but I'm probably not comfortable
enough with the internals + perf. optimizations to be comfortable signing off
on this. (Aside: it seems like a lot of the complexity here comes from what
seem like (necessary) perf. optimizations, such as not keeping per-task wait
timers, using locality levels to index into parallel arrays, etc.).
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