Github user squito commented on the pull request:

    https://github.com/apache/spark/pull/11644#issuecomment-195429708
  
    I can't see the earlier version of this diff, but I dont' understand why 
you'd need to introduce a `SparkEnv`.  I see that currently, when a `WebUI` is 
created, you no longer know which conf was responsible for choosing the port.  
But that seems easy to fix -- couldn't the constructor just also take a 
`portConf: Option[String]`?
    
    In any case, this is a strict improvement as-is -- if that adds too much 
complexity to get the correct conf name in there or something, its fine w/ me 
to add this as is.


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