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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