Github user pwendell commented on the pull request:

    https://github.com/apache/spark/pull/1369#issuecomment-50955760
  
    Hey on this one - it's helpful to see what this looks like - but my 
instinct is actually to move away from scala-logging entirely. We can upgrade 
ourselves, but all that does is force our users downstream to have to upgrade 
(even if they aren't using ml stuff at all), causing the same annoying headache 
as breeze is causing us. I'd prefer to just remove the (now very small) use of 
scala-logging and just continue to use the slf4j API directly. The mian benefit 
of scala-logging is the use of compile time macro's for some performance gain, 
but we've never in the entire history of Spark had any performance issues 
related to logging.


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