Github user jerryshao commented on the issue:
https://github.com/apache/spark/pull/20460
> I'd target this 2.3 & master. Waiting for tests
@felixcheung is it too risky to target to 2.3, this is a fundamental
behavior change. We should make sure k8s could well use fractional cores, in
the mean time we should also guard other cluster manager to use it. I think we
need more tests on it.
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