Github user MaxGekk commented on the issue: https://github.com/apache/spark/pull/21589 > Are you maybe able to manually test this in other cluster like standalone or yarn too? I have tested standalone mode but didn't check yarn though `YarnClientSchedulerBackend` and `YarnClusterSchedulerBackend` both use `CoarseGrainedSchedulerBackend` in which the two new methods are defined. The `CoarseGrainedSchedulerBackend` is extended by `StandaloneSchedulerBackend` which inherits implementation of `numCores()` and `numExecutors()`. I hope that checking of the standalone mode is enough.
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