Github user revans2 commented on the pull request:
https://github.com/apache/storm/pull/603#issuecomment-115284737
This was actually done on purpose. If you have run-as-user enabled and you
run a topology as the supervisor user, that topology now has the ability to
launch things as other users. We put it here so users would get an error
early. If you want to run this way I really would like to see an explicit
configuration to enable it that is off by default.
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