Github user KaiXinXiaoLei commented on the pull request:
https://github.com/apache/spark/pull/8737#issuecomment-139998027
Run a long job, and stages have many tasks. During running tasks, the AM
is failed. Then a new AM restarts. In ExecutorAllocationManager, because there
is many tasks to run, the value of numExecutorsTarget is the value of
spark.dynamicAllocation.maxExecutors and does not changed. So driver does not
send RequestExecutors message to AM. So the new AM does not know the total
number of executors.
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