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                            累加器：只允許add操作，常用于實現計數。
```scala
object App {
  def main(args: Array[String]): Unit = {
    val spark:SparkSession = SparkSession.builder()
      .master("local[4]")
      .appName(this.getClass.getName)
      .getOrCreate()
    val sc:SparkContext = spark.sparkContext
    import spark.implicits._

    val accum = sc.longAccumulator("My Accumulator") // 獲取累加器

    sc.parallelize(Array(1, 2, 3, 4)).foreach(x => accum.add(x))

    println(accum.value) // 10
    println(accum.count) // 4
  }
}
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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