mridulm commented on PR #37779:
URL: https://github.com/apache/spark/pull/37779#issuecomment-1259007734

   Thanks for the query @Ngone51 - I missed out one aspect of my analysis, 
which ends up completely changing the solution - my bad :-(
   
   The answer to your query has the reason for the lack of failure - this is 
due to the two types of api's we are using ...
   
   For `DeducatedMessageLoop`, for the initial submission of 
`receiveLoopRunnable` - we use `ExecutorService.submit` api - while for other 
cases, we use the `Executor.execute` api - and this is the cause for the 
behavior.
   
   The `submit` api returns a `Future` - and if we look at the implementation 
of `FutureTask.run`, we see that it catches `Throwable` and preserves that as 
the outcome (`setException`) - which is the reason why the thread itself does 
not die.
   
   
   So the specific case might be mitigated by using `execute` instead of 
`submit` api.


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