Winner941112的博客

    Spark 2.X 中的累加器和 Spark 1.X中有着很大不同，下面将实现的功能是：将一个集合，集合中含有字母 "A","B","A","D","E","D","G","H","I","A","B","I","G","D&quot

自定义Accumulator：Scala自定义accumulator代码：import org.apache.spark.util.AccumulatorV2 class MyAccumulator2 extends AccumulatorV2[String,String]{ private var res = "" override def isZero: Boolean = {re...