kongkong的专栏

  #flatMap val favMovies = sc.parallelize(List("Pulp Fiction","Requiem for a dream","Aclockwork Orange")); favMovies.flatMap(movieTitle=>movieTitle.split(" ")).collect()   #sample val data = s...

spark下载地址：http://spark.apache.org/downloads.html   #解压:    tar -xzvf spark-2.4.0-bin-hadoop2.6.tgz cd  spark-2.4.0-bin-hadoop2.6 #执行命名 进入控制台 ./bin/spark-shell var lines = sc.textFile("README...

单机版启动报错:  2019-02-21 09:46:24 WARN  Utils:66 - Service 'sparkDriver' could not bind on a random free port. You may check whether configuring an appropriate binding address. 2019-02-21 09:46:24 WARN  ...

val names = List("a", b", "c") names.map(_.toUpperCase) names.foreach(println) names.foreach{ name => println(name) } # res10: List[Int] = List(1, 2, 1, 3, 4, 3, 5) 数据展开 # flatten可以把嵌套的展开 L...