Maven开发Spark程序

Posted 2021-11-07 shi_zi_183

Maven开发Spark程序

新建Maven项目

将src/main/java改名为src/main/scala
修改pom.xml
pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.example</groupId>
    <artifactId>sparkTest</artifactId>
    <version>1.0-SNAPSHOT</version>
    <dependencies>
        <dependency>
            <groupId>org.scala-lang</groupId>
            <artifactId>scala-library</artifactId>
            <version>2.11.8</version>
        </dependency>
        <!--spark core depedency-->
        <dependency>
            <groupId>org.apache.spark</groupId>
            <artifactId>spark-core_2.12</artifactId>
            <version>3.1.2</version>
        </dependency>

        <!--hadoop-client depedency-->
        <dependency>
            <groupId>org.apache.hadoop</groupId>
            <artifactId>hadoop-client</artifactId>
            <version>3.3.0</version>
        </dependency>
    </dependencies>
</project>

引入scala依赖
File->Project Structure


这样scala目录就可以创建scala文件了。

编写scala程序

wordCount

package com.example

import org.apache.spark.{SparkConf, SparkContext}

object wordCount {
  def main(args: Array[String]): Unit = {
    val conf=new SparkConf()
    conf.setAppName("MyFirstSparkApplication")
    conf.setMaster("yarn")
    val sc=new SparkContext(conf)
    val data=sc.textFile(args(0))
    val words=data.flatMap(_.split("\\n")).flatMap(_.split(" ")).map((_,1)).reduceByKey(_+_).collect()
    words foreach println
  }
}

IDEA打包
File->Project Structure






集群上运行

spark-submit --master yarn --name wordCount --class com.example.wordCount hdfs:///sparkTest.jar /user/hadoop/input

其中/user/hadoop/input为hdfs路径。