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Does the cluster expect a "yarn" service user?

Question asked by reedv on May 16, 2018

Going through the Cask documentation for installing CDAP for MapR and notice that part of the instructions involves creating a user directory for what appears to be a service user named "yarn" (Installation for MapR). Nowhere in the preceding docs for the installation is there mention of creating such a user (in fact, doing a quick google search I could only find a reference to it here: Managing queue access with ACLs - Hadoop Dev), so my question is: is this a user that should already exist across the cluster regardless of CDAP (because that is not the case for the cluster I am working on (v6.0))? If not, should I just create one and is there some special value for its uid and gid I should be aware of? Thank you.