Github user vanzin commented on the issue:
https://github.com/apache/spark/pull/19049
Agree with Sean here, in the vast majority of cases the master of all
applications will be the same, because it's very uncommon for the same cluster
to use different cluster managers, and for different clusters to share the same
SHS.
Even if that were the case, having this information in the application list
isn't very useful by itself. If you're really looking for that, you can see
that in the app's environment page.
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