Github user bersprockets commented on the issue:

    https://github.com/apache/spark/pull/20519
  
    >Can't we just go with the error message for now?
    
    Sure, but before we decide not to fix, did you see my comment 
[above](https://github.com/apache/spark/pull/20519#issuecomment-364677070) on a 
much less invasive fix to this issue (very little will change but will fix it 
in most cases). Summary of that comment: daemon.py should write some expected 
header to stdout before writing the port number to let PythonWorkerFactory know 
when the daemon's output starts.


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