read file in executor's local directory when submit with "--files" options

object SimpleApp {
  def main(args: Array[String]) {
    val logFile = "userdata.txt" // Should be some file on your system
    val spark = SparkSession.builder.appName("Simple Application").getOrCreate()
    val sc = spark.sparkContext
    val data = Array(1)
    val distData = sc.parallelize(data)
    distData.map(x => readLocalFile(x)).collect().foreach(println)
    spark.stop()
  }
  def readLocalFile(x: Int) : String = {
     val filename = "userdata.txt"
     return Source.fromFile(filename).mkString
  }
}