Github user thideeeee commented on the issue:

    https://github.com/apache/spark/pull/18846
  
    @zsxwing Thank you for the pointer. I tested manually, as far as I tested, 
Spark works as expected even if we apply this patch. I was able to confirm that 
driver/executor shut down when its connection lost.
    
    ```
    On env which can reverse DNS lookup:
    17/08/10 19:11:06 ERROR CoarseGrainedExecutorBackend: Executor self-exiting 
due to : Driver ip-10-46-12-135.us-west-2.compute.internal:34105 disassociated! 
Shutting down.
    
    On env which cannot reverse DNS lookup:
    17/08/11 02:14:32 ERROR CoarseGrainedExecutorBackend: Executor self-exiting 
due to : Driver 172.16.1.26:36997 disassociated! Shutting down.
    ```
    
    On the other hand, all the tests were failed. All the reasons of test 
failure were different, it looks the test failed randomly. Still looking why 
the test failed.


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