Github user mgummelt commented on the issue:
https://github.com/apache/spark/pull/17723
I also have to admit that even after all this discussion, I'm still unclear
what the concern is. Hadoop security classes, such as `UGI` are already
exposed to users. For example, through `--proxy-user`.
Also, even if `ServiceCredentialProvider`, which depends on hadoop, is a
public interface, that doesn't mean we can't support non-hadoop security.
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