Github user srowen commented on the issue:
https://github.com/apache/spark/pull/15779
I agree that exceptions can become, quite surprisingly, part of a public
API. It has to be done with care. I am not sure I agree that failure codes are
better; they're exceptions that don't use a language API and are even more
ignorable. If it's simply status, that makes sense; if it's indicating failure,
you want it to be hard-er to ignore.
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