Github user vanzin commented on the issue:
https://github.com/apache/spark/pull/19227
> If people have a standalone cluster they have secured off for only a set
of users and they all run under a single user, having access to secure HDFS is
still very useful.
No disputing that, but you can do that today by manually deploying a keytab
to all worker nodes, and making sure its "kinit'ed" before the worker daemon
goes up (and the login refreshed periodically). No changes in Spark needed for
that.
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