Github user vanzin commented on the issue:
https://github.com/apache/spark/pull/18519
> I also added support for the user to pass a ticket-granting ticket
instead of a key tab
It'd be better to avoid adding new features after the patch has been
reviewed and is mostly ready for checking in.
For example, you added a feature that is not necessary.
`UserGroupInformation` automatically loads the kerberos ticket cache from its
default location, or you can set `KRB5CCNAME` in your environment if you want
to use a custom location.
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