Github user ScrapCodes commented on a diff in the pull request:

    https://github.com/apache/spark/pull/2615#discussion_r19322477
  
    --- Diff: conf/spark-env.sh.template ---
    @@ -3,6 +3,9 @@
     # This file is sourced when running various Spark programs.
     # Copy it as spark-env.sh and edit that to configure Spark for your site.
     
    +# Uncomment this if you plan to use scala 2.11
    +# SCALA_VERSION=2.11
    --- End diff --
    
    Is it okay to leave this as is, even if we have automatic guessing of scala 
version on ? Otherwise there is no way to know that one can set a preferred 
scala version too.


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