Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/8668#issuecomment-140601612
Ok, I think I see what the problem is. But your fix is not correct.
The problem is here:
doRequestTotalExecutors(
numExistingExecutors + numPendingExecutors -
executorsPendingToRemove.size)
By subtracting `executorsPendingToRemove.size` when that list contains an
executor that is pending replacement, that replacement will be lost. The fix is
to keep track of how many replacement executors the code is waiting for, and
account for that in the above equation, not to remove that code altogether.
> So there is no need to change the number of executors when killing
executors.
That's not true, in YARN, at least. See SPARK-6325. So you can't make your
current change unless you also change how the YARN backend does accounting for
the running executors.
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