Github user jerryshao commented on the issue:
https://github.com/apache/spark/pull/20460
I think here
(https://github.com/apache/spark/blob/032c11b83f0d276bf8085992229b8c598f02798a/core/src/main/scala/org/apache/spark/ExecutorAllocationManager.scala#L117)
should also be fixed.
Besides, I think "spark.task.cpus" should also be fixed, right? BTW, looks
like dynamic allocation can not be well supported if cores are fractional.
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