hadoop入门系列之九--使用IDEA开发Spark Application及Local与打包测试讲解

1. 安装IDEA和scala

    IDEA 可以去官网下载

    scala插件 https://plugins.jetbrains.com/plugin/1347-scala

    要注意IDEA需要对应的jdk版本

2. 新建scala项目

3.配置项目结构和dependencies，要在libraries里加入spark

 

4. 运行hello workd测试项目是否可以

object HelloWorld3 {
  def main(args: Array[String]) {
    println("Hello World")
  }
}

5. 新建sparkdemo，测试

//System.setProperty("HADOOP_USER_NAME", "hadoop01");
/*val logFile = "hdfs://10.10.0.141:9000/user/hadoop01/mapreduce/wordcount/input/wc.input" // Should be some file on your system
val conf = new SparkConf().setAppName("Simple Application")
val sc = new SparkContext(conf)
val rdd=sc.textFile(logFile)
val wordcount=rdd.flatMap(_.split(" ")).map((_,1)).reduceByKey(_+_)
wordcount.saveAsTextFile("hdfs://10.10.0.141:9000/user/hadoop01/mapreduce/wordcount/sparkoutput4");
sc.stop()

 最后在hdfs里查看运行结果

bin/hdfs dfs -text /user/hadoop01/mapreduce/wordcount/sparkoutput3/part*