val conf = new SparkConf().setAppName(...).setMaster(...)
.set("spark.serializer", "org.apache.spark.serializer.KryoSerializer")
.set("spark.kryoserializer.buffer.max", "128m")
.set("spark.kryoserializer.buffer", "64m")
Array(classOf[ArrayBuffer[String]], classOf[ListBuffer[String]])