Github user dongjoon-hyun commented on the issue:

    https://github.com/apache/spark/pull/15291
  
    Yep. It's not recommended, too. In fact, during RC4 pre-preparation with 
new machine, it happens to me. Because, I installed Java/Python/R and tried 
this before making any user account.
    
    If you prefer, I can transform this PR into some warning or documentation 
PR. How do you think about that? I think we had better resolve the current 
status in any way. Already, a user create an JIRA issue for this.


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