Github user jerryshao commented on the issue:
https://github.com/apache/spark/pull/15669
I think this issue also existed in yarn client mode, files will be added
twice (once with Spark's file server, another with distributed cache), because
both file server and yarn#client could find this file, then there's no
exception. But this will be failed in yarn cluster mode since spark file server
could not find out file with specified path.
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