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這裏是Scala的新開發者,也是Spark GraphX的新用戶。 到目前爲止,我真的很享受我的時間,但我剛剛有一個非常奇怪的錯誤。我已經將問題隔離爲長整型轉換,但它確實很奇怪。 另一個奇怪的是,它在Windows中正常工作,但在Linux中無法正常工作(創建無限循環)我在Linux中找到了問題的根源,但我不明白爲什麼會出現問題。我必須先將隨機數字放入一個變量中,然後才能正常工作。使用Spark GraphX時INT/LONG轉換的奇怪錯誤
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斯卡拉2.10.6,星火2.1.0,Linux操作系統Ubuntu 16.04
import org.apache.spark.{SparkConf, SparkContext}
import org.apache.spark.graphx._
import scala.util.Random
object Main extends App {
//Fonction template pour imprimer n'importe quel graphe
def printGraph[VD,ED] (g : Graph[VD,ED]): Unit = {
g.vertices.collect.foreach(println)
}
def randomNumber(limit : Int) = {
val start = 1
val end = limit
val rnd = new Random
start + rnd.nextInt((end - start) + 1)
}
val conf = new SparkConf()
.setAppName("Simple Application")
.setMaster("local[*]")
val sc = new SparkContext(conf)
sc.setLogLevel("ERROR")
val myVertices = sc.makeRDD(Array((1L, "A"), (2L, "B"), (3L, "C"), (4L, "D"), (5L, "E"), (6L, "F")))
val myEdges = sc.makeRDD(Array(Edge(1L, 2L, ""),
Edge(1L, 3L, ""), Edge(1L, 6L, ""), Edge(2L, 3L, ""),
Edge(2L, 4L, ""), Edge(2L, 5L, ""), Edge(3L, 5L, ""),
Edge(4L, 6L, ""), Edge(5L, 6L, "")))
val myGraph = Graph(myVertices, myEdges)
//Add a random color to each vertice. This random color is chosen from the total number of vertices
//Transform vertex attribute to color only
val bug = myVertices.count()
println("Long : " + bug)
val bugInt = bug.toInt
println("Int : " + bugInt)
//Problem is here when adding myGraph.vertices.count().toInt inside randomNumber. Works on Windows, infinite loop on Linux.
val g2 = myGraph.mapVertices((id, name ) => (randomNumber(myGraph.vertices.count().toInt)))
//Rest of code removed
}