Github user vanzin commented on the issue:

    https://github.com/apache/spark/pull/14931
  
    The issue I see is how easy is it for the driver to know that? Adding a new 
flag to the `SlaveLost` class doesn't mean that you know how to set its value.
    
    I'm pretty sure, on the YARN side, that we don't know when hosts die, just 
that a container on that host went away. Maybe Standalone or Mesos would have 
that info more easily available (e.g. the `WorkerWatcher` code for Standalone).


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