Github user prabhjyotsingh commented on the issue:

    https://github.com/apache/zeppelin/pull/1322
  
    > It's better to use RUNAS ~ and su - ~
    
    @jongyoul  How about I make `use RUNAS ~ and su - ~` by default, but if in 
`zeppelin-env.sh` a property say `USE_SSH_IMPERSONATION` is set to true, then 
it will use `ssh web-user@localhost` in this way user gets to decide, what is 
best suited for their user case.
    
    >Could you check this PR support `scoped` as well which uses multiple 
threads in one process?
    
    Yes I've checked this with Shell and Python interpreter it was working as 
expected.
    
    @Leemoonsoo, yes agreed, I too think this options should be there, and have 
implemented it as well. If you take a look at GIF attached in this PR 
description, it's doing that you are asking for :)


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