目的:通過spark-submit提交scala代碼
scala代碼需要先編譯才能在spark上跑
工具:sbt
下載地址sbt
正式開始
假設現在的地址是 /home/sparknode/scalacode,則需要先
mkdir -p src/main/scala
(路徑必須嚴格遵守,少一個都不行)
然後在 /home/sparknode/scalacode/src/main/scala 下創建 wordCount.scala
#wordcount程序
import org.apache.spark.{SparkConf,SparkContext}
object wordCount{
def main(args:Array[String]){
val conf = new SparkConf().setAppName("wordCount").setMaster("local")
val sc = new SparkContext(conf)
val lines = sc.textFile("file:///home/sparknode/桌面/word.txt")
val words = lines.flatMap(_.split(" ")).filter(word => word != "")
val pairs = words.map(word => (word,1))
val wordscount = pairs.reduceByKey(_ + _ )
wordscount.collect.foreach(println)
sc.stop()
}
}
然後回到/home/sparknode/scalacode,創建sample.sbt
#修改自己的scala和spark版本
name := "Simple Project"
version := "1.0"
scalaVersion := "2.11.6"
libraryDependencies += "org.apache.spark" %% "spark-core" % "2.3.2"
之後在/home/sparknode/scalacode
sbt的安裝地址/bin/sbt package
此時完成了編譯,生成了simple-project_2.11-1.0.jar。
在spark上運行
spark-submit --class "wordCount" --master local /home/sparknode/scalacode/target/scala-2.11/simple-project_2.11-1.0.jar
這裏的 --class 爲 wordCount.scala的主類名