Github user squito commented on the pull request:
https://github.com/apache/spark/pull/8559#issuecomment-219840630
@mateiz @markhamstra @kayousterhout I've updated this to avoid changing the
scheduler at all, and instead just run the mock backend in another thread. It
slightly complicates writing the tests, but avoids a (small) race in the tests
and was probably necessary when we got to more complicated tests in any case.
In particular I want this for more tests on blacklisting
([SPARK-8426](https://github.com/apache/spark/pull/8760)), but I think there
are a handful of open scheduler issues which will benefit from it.
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