手把手教你 在IDEA搭建 SparkSQL的开发环境

1. 创建maven项目 在IDEA中添加scala插件 并添加scala的sdk

https://www.cnblogs.com/bajiaotai/p/15381309.html

2. 相关依赖jar的引入 配置pom.xml

2.1 pom.xml 示例 (spark版本: 3.0.0  scala版本: 2.12)

<?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.dxm.sparksql</groupId>
    <artifactId>sparksql</artifactId>
    <version>1.0-SNAPSHOT</version>

    <!-- 指定变量 spark的版本信息 scala的版本信息--> 
    <properties>
        <spark.version>3.0.0</spark.version>
        <scala.version>2.12</scala.version>
    </properties>

    <dependencies>

        <dependency>
            <groupId>org.apache.spark</groupId>
            <artifactId>spark-core_${scala.version}</artifactId>
            <version>${spark.version}</version>
        </dependency>

        <dependency>
            <groupId>org.apache.spark</groupId>
            <artifactId>spark-yarn_${scala.version}</artifactId>
            <version>${spark.version}</version>
        </dependency>
        <dependency>
            <groupId>org.apache.spark</groupId>
            <artifactId>spark-sql_${scala.version}</artifactId>
            <version>${spark.version}</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.27</version>
        </dependency>

        <dependency>
            <groupId>org.apache.spark</groupId>
            <artifactId>spark-hive_${scala.version}</artifactId>
            <version>${spark.version}</version>
        </dependency>

        <dependency>
            <groupId>org.apache.hive</groupId>
            <artifactId>hive-exec</artifactId>
            <version>1.2.1</version>
        </dependency>

    </dependencies>


</project>

2.2 spark版本与scala版本对应关系的问题

#根据下面链接 即可查询 spark版本和scala版本的对应关系及依赖配置
https://www.cnblogs.com/bajiaotai/p/16270971.html

2.3 在scala代码中查看运行时的scala版本

println(util.Properties.versionString)

2.4 FAQ 因Spark版本和Scala版本不一致导致的报错

待补充

3. 代码测试

object TestSparkSQLEnv extends App {

  //1.初始化 SparkSession 对象
  val spark = SparkSession
    .builder
    .master("local")
    //.appName("SparkSql Entrance Class SparkSession")
    //.config("spark.some.config.option", "some-value")
    .getOrCreate()

  //2.通过 SparkSession 获取 SparkContext
  private val sc: SparkContext = spark.sparkContext

  //3.设置日志级别
  // Valid log levels include: ALL, DEBUG, ERROR, FATAL, INFO, OFF, TRACE, WARN
  // This overrides any user-defined log settings //会覆盖掉 用户设置的日志级别 比如 log4j.properties
  sc.setLogLevel("ERROR")

  import spark.implicits._

  //4.创建DataFream
  private val rdd2DfByCaseClass: DataFrame = spark.sparkContext
    .makeRDD(Array(Person("疫情", "何时"), Person("结束", "呢")))
    .toDF("名称", "行动")
  rdd2DfByCaseClass.show()
  //  +----+----+
  //  |名称|行动|
  //  +----+----+
  //  |疫情|何时|
  //  |结束|  呢|
  //  +----+----+

  //5.关闭资源
  spark.stop()

}

4. 结束语

如果能正常执行,恭喜你环境搭建没问题,如果遇到问题请留言共同探讨