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

    https://github.com/apache/spark/pull/12250#discussion_r58973677
  
    --- Diff: build/mvn ---
    @@ -98,9 +101,10 @@ install_scala() {
       local scala_version=`grep "scala.version" "${_DIR}/../pom.xml" | \
                            head -1 | cut -f2 -d'>' | cut -f1 -d'<'`
       local scala_bin="${_DIR}/scala-${scala_version}/bin/scala"
    +  local TYPESAFE_MIRROR=${TYPESAFE_MIRROR:-https://downloads.typesafe.com}
     
       install_app \
    -    "https://downloads.typesafe.com/scala/${scala_version}"; \
    +    "${TYPESAFE_MIRROR}/scala/${scala_version}" \
         "scala-${scala_version}.tgz" \
    --- End diff --
    
    This is unrelated to your change, but I wonder if Spark really needs to 
download the Scala distribution like this, or if the maven/ivy dependency 
resolution is enough.


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