Github user JoshRosen commented on the issue:
https://github.com/apache/spark/pull/14396
I'll have to see about the JAR case, but I think that the case of
re-uploading a file behaves in an especially-confusing way if the contents are
different: the `Utils.fetchFile()` call on the driver would cause the driver's
`addFile()` call to throw an exception but this would happen after the
`addedFiles(key) = timestamp` assignment, meaning that executors will already
have been bricked.
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