Github user squito commented on the issue:
https://github.com/apache/spark/pull/17656
yeah, looks like the right change, I think it was just overlooked in
https://issues.apache.org/jira/browse/SPARK-14245
I'd ask that you add an assertion to this unit test:
https://github.com/apache/spark/blob/master/core/src/test/scala/org/apache/spark/ui/UISeleniumSuite.scala#L655
```scala
(attempts(0) \ "sparkUser").extract[String] should not be ("")
```
aside, I'm not sure why SPARK-14245 introduced a different way of getting
the user from what the history server uses, but in any case I think this change
is right, to do the same thing as the UI, even if those internals should be
changed.
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