Github user steveloughran commented on the issue:
https://github.com/apache/spark/pull/15984
Like you note, tests will be good here. Don't forget the corner cases:
unknown app, duplicate POSTs, known app but unknown attempt. I'm also curious
about what the policy would be if there is >1 attempt in the history, but no
attempt Id in the delete.
Also: would it ever be the case that a history provider didn't support
deletion? I can see where that would arise, but suspect that in such a case,
you'd just deploy it with the deletion option disabled
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