Github user wangyum commented on the issue:
https://github.com/apache/spark/pull/16819
@srowen . Dynamic set `spark.dynamicAllocation.maxExecutors` can avoid
some strange problems:
1. [Spark application hang when dynamic allocation is
enabled](https://issues.apache.org/jira/browse/SPARK-16441)
2. [Report failure reason from Reporter
Thread](https://issues.apache.org/jira/browse/SPARK-19226)
3. CLI shows successful but web ui didn't, simally to
[this](https://issues.apache.org/jira/secure/attachment/12846513/can-not-consume-taskEnd-events.jpg)
I add a unit test just now.
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