Github user jiangxb1987 commented on the issue: https://github.com/apache/spark/pull/22849 It may happen that a busy executor is marked as lost and later it re-register to the driver, in that case currently we call `makeOffers()` and that will add the executor into `TaskSchedulerImpl.hostToExecutors`. This is bad implementation here since it shall not have depend on the `makeOffers()` function to update a unrelated protected val, but that's what we have for now.
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