Github user KaiXinXiaoLei commented on the pull request:
https://github.com/apache/spark/pull/7352#issuecomment-120815134
I mean: If the thread throws exception, it will stop. And it will not
recovery. So when the new ApplicationMaster starts and not tasks are running,
the number of executor is not zero.
For example:
1.The old ApplicationMaster is dead or disconnected
2. Submit tasks before the new ApplicationMaster starts,
3. The spark-dynamic-executor-allocation thread will ask to add
executors. This thread throws exception and retry three times. Then this thread
stops.
4. When the new ApplicationMaster starts, and submit tasks.
5. After the tasks is over. the number of executors is not zero.
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