flink简单离散器写法

val env = ExecutionEnvironment.getExecutionEnvironment
val text = env.readTextFile("D://data.csv")
val counts = text.flatMap {
  _.split("\n")
}.map { x => {
  val arr = x.split(",")
  val seq = Seq()
  val ts = arr(0)
 val value1 = arr(1).toInt
  val value2 = arr(2).toInt
  (ts,value1,value2)
}
}.groupBy(0).reduceGroup(x=>{

  val seq = x.toSeq
  val avg = (seq(0)._2+seq(0)._3+seq(1)._2+seq(1)._3)/4
  val des = Math.sqrt(((seq(0)._2-avg)*(seq(0)._2-avg)+(seq(1)._2-avg)*(seq(1)._2-avg)+(seq(0)._3-avg)*(seq(0)._3-avg)+(seq(1)._3-avg)*(seq(1)._3-avg))/4)
  val values = des/avg
  (seq(0)._1,values)
})
counts.print()