Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/20519
I am not yet fully sure about how sitecustomize fills some bytes to stdout
but I believe it doesn't always happen because at least we have it for Python
coverage -
https://github.com/apache/spark/blob/master/python/test_coverage/sitecustomize.py.
The only way I used to verify this PR and
https://github.com/apache/spark/pull/20424 was to manually add some bytes to
stdout.
So, I am still thinking it's a corner case .. Can we otherwise simply flush
and remove the stdout right before starting the daemon?
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