Github user vanzin commented on the issue:
https://github.com/apache/spark/pull/16788
> Ah, I didn't realize that the --keytab parameter was expected to be an
HDFS location. Thanks.
It's not. It's just how the YARN module chose to distribute the keytab.
But the main point is that support for kerberos should not require a
keytab. All you need is a kerberos login, which /does not require a keytab/
(you can use "kinit" to log in with your password).
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