Github user peshopetrov commented on the issue:

    https://github.com/apache/spark/pull/20512
  
    For completeness it should be possible to enable OS-level TCP keep alives. 
The client does enable TCP keepalive on its side and it should be possible on 
the server too.
    
    However, independent of that it perhaps makes sense to also have 
application level heartbeats because in the JVM it seems it's not possible to 
tune the timeouts of TCP keepalive.


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