Github user dragos commented on the pull request:

    https://github.com/apache/spark/pull/6903#issuecomment-114047990
  
    @mateiz Indeed. I tested this with Scala 2.11.6, but I would prefer to move 
to 2.11.7 (should be out this week) ASAP. 2.11.7 has a shaded version  of 
jline, which means we can build hive-thriftserver and `spark-sql` would work 
too.
    
    Currently, Spark depends on Scala 2.11.6, and that's the version that gets 
bundled in the assembly jar (and the distribution). I didn't find any mention 
in the docs on how to build with a different Scala version, so my assumption 
was that Spark fixes the Scala version you're going to use *in the spark-shell*.
    
    (I'm pretty sure a determined dev would find a way to pass `scala.version` 
from the outside, but it doesn't seem to be a supported scenario).


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