Github user sryza commented on the pull request:
https://github.com/apache/spark/pull/5536#issuecomment-94611689
More broadly:
I agree with you that the current code is really really difficult to reason
about. When I added the ability to cancel executor requests, I spent a while
thinking about how we could rewrite everything to make the logic more intuitive
and wasn't able to come up with anything great. I definitely wouldn't rule out
the possibility that you can come up with something better. But given that, if
it's possible, it's likely not going to be an easy or quick task, I don't think
we should allow the prospect of a rewrite to hold us back from writing tests.
As long as we're stuck with the current code, they're an important way to help
us manage its complexity.
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