Github user zsxwing commented on the issue:
https://github.com/apache/spark/pull/14396
@JoshRosen LGTM for the current patch. However, I have a question about the
following description in your PR:
> At file download time, Spark tasks will fail with exceptions if an
executor already has a local copy of a file and that file's contents do not
match the contents of the file being downloaded / added.
`Utils.fetchFile` will skip the downloading step if a local copy exists.
Hence it won't check the content. I think the file content checking is just to
prevent from hash code conflicts for caching file names.
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