Github user kayousterhout commented on the issue:
https://github.com/apache/spark/pull/15326
+1 to Mark's suggestion about putting the behavior in Pool::addSchedulable,
so that it works across all Schedulables.
I'm less convinced about maintaining the existing behavior where the last
added pool wins. I think people usually expect first-wins behavior for these
things (e.g., that's the case for Java classpath issues), and the code is also
simpler for that approach. Given that this should be affecting pretty few
people (and there's now a warning logged), I think this would be fine to change.
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