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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