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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