in scripts/tuple_serializers.scala [165:175]
def registerSp1(scalaVersion: String)(typeNm: String): String =
scalaVersion match {
case "2.10" =>
"""newK.register(classOf[Tuple1$mcSHORT$sp], new Tuple1TYPESerializer)"""
.replace("TYPE", typeNm)
.replace("SHORT", typeMap(typeNm))
case _ =>
"""newK.register(Class.forName("scala.Tuple1$mcSHORT$sp"), new Tuple1TYPESerializer)"""
.replace("TYPE", typeNm)
.replace("SHORT", typeMap(typeNm))
}