spark小案例实战2（scala + spark2 版本）：对两列排序

需求：

 

实现步骤：

 

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class SecondSortKey(val first:Int,val second:Int) extends Ordered[SecondSortKey] with Serializable{
  override def compare(that: SecondSortKey): Int = {
    if(this.first - that.first !=0){
      this.first-that.first
    }else{
      this.second-that.second
    }
  }
}
object SecondSort {
  def main(args: Array[String]): Unit = {
    val spark = SparkSession.builder().appName("SecondSort").master("local").getOrCreate()
    val lines = spark.sparkContext.textFile("D:\\sort.txt")
    val pairs = lines.map{line => (
      new SecondSortKey(line.split(" ")(0).toInt,line.split(" ")(1).toInt),line
    )}
    val sortedParis = pairs.sortByKey()
    val sortedLines = sortedParis.map(pairs => pairs._2)
    sortedLines.foreach(s => println(s))
    spark.stop()
  }
}