Github user mridulm commented on the pull request:
https://github.com/apache/incubator-spark/pull/332#discussion_r9853916
Typically, this is set to the domain; though nowadays it is common to set
it to a static application specific string (which is probably what hadoop is
doing ?) since authorization is fairly limited in scope (allow or deny as a
while : no domain specific acls and/or resource/access partitions).
Would be nice if this could be overridden by users via some (hidden for
now) env variable - simply to allow for future customization without code
change : this is ofcourse not very important given the scope of the PR itself !
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