Github user thideeeee commented on the issue:
https://github.com/apache/spark/pull/18846
In my understanding, this does not affect driver/executor's heartbeat
behavior since this PR only changes DRIVER_HOST_ADDRESS.
However, I am not sure why the unit test was failed.
The reason I want to apply this change is the client of Spark context web
UI is not Spark components. (The client will be web browser and Hadoop
ResourceManager's webproxy) Since it is difficult to change these clients'
behavior, I thought we should change Spark side behavior.
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