Spark入门（三）Idea构建spark项目

叁歲伎倆 2023-07-02 15:25 22阅读 0赞

### 一、依赖包配置 ###

scala与spark的相关依赖包，spark包后尾下划线的版本数字要跟scala的版本第一二位要一致，即2.11

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.mk</groupId>
      <artifactId>spark-test</artifactId>
      <version>1.0</version>
    
      <name>spark-test</name>
      <url>http://spark.mk.com</url>
    
      <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
        <scala.version>2.11.1</scala.version>
        <spark.version>2.4.4</spark.version>
        <hadoop.version>2.6.0</hadoop.version>
      </properties>
    
      <dependencies>
        
        <dependency>
          <groupId>org.scala-lang</groupId>
          <artifactId>scala-library</artifactId>
          <version>${scala.version}</version>
        </dependency>
    
        
        <dependency>
          <groupId>org.apache.spark</groupId>
          <artifactId>spark-core_2.11</artifactId>
          <version>${spark.version}</version>
        </dependency>
        <dependency>
          <groupId>org.apache.spark</groupId>
          <artifactId>spark-sql_2.11</artifactId>
          <version>${spark.version}</version>
        </dependency>
    
    
        <dependency>
          <groupId>junit</groupId>
          <artifactId>junit</artifactId>
          <version>4.11</version>
          <scope>test</scope>
        </dependency>
      </dependencies>
    
      <build>
        <pluginManagement>
          <plugins>
    
            <plugin>
              <artifactId>maven-clean-plugin</artifactId>
              <version>3.1.0</version>
            </plugin>
    
            <plugin>
              <artifactId>maven-resources-plugin</artifactId>
              <version>3.0.2</version>
            </plugin>
            <plugin>
              <artifactId>maven-compiler-plugin</artifactId>
              <version>3.8.0</version>
            </plugin>
            <plugin>
              <artifactId>maven-surefire-plugin</artifactId>
              <version>2.22.1</version>
            </plugin>
            <plugin>
              <artifactId>maven-jar-plugin</artifactId>
              <version>3.0.2</version>
            </plugin>
          </plugins>
        </pluginManagement>
      </build>
    </project>

### 二、PI例子 ###

java重新编写scala的PI例子

package com.mk;
    
    import org.apache.spark.SparkConf;
    import org.apache.spark.api.java.JavaSparkContext;
    import org.apache.spark.sql.SparkSession;
    
    import java.util.ArrayList;
    import java.util.List;
    
    
    
    public class App 
    {
        public static void main( String[] args )
        {
            SparkConf sparkConf = new SparkConf();
            if(System.getProperty("os.name").toLowerCase().contains("win")) {
                sparkConf.setMaster("local[2]");//本地模拟
                System.out.println("使用本地模拟是spark");
            }
    
            SparkSession session = SparkSession.builder().appName("Pi").config(sparkConf).config(sparkConf).getOrCreate();
            int slices =2;
            int n = (int)Math.min(100_000L * slices, Integer.MAX_VALUE);
            JavaSparkContext sparkContext = new JavaSparkContext(session.sparkContext());
    
            List<Integer> list = new ArrayList<>(n);
            for (int i = 0; i < n; i++)
                list.add(i + 1);
            int count  = sparkContext.parallelize(list, slices).
                    map(v -> {
                        double x = Math.random() * 2 - 1;
                        double y = Math.random() * 2 - 1;
                        if (x * x + y * y < 1)
                            return 1;
                        return 0;
                    }).reduce((Integer a, Integer b) ->a+b);
             System.out.println("PI:"+  4.0 * count / n);
            session.stop();
    
        }
    }

### 三、直接在idea本地运行 ###

输出PI

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9tYW9rdW4uYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70][]

### 四、spark集群提交 ###

项目打成jar，把spark-test.jar上传到~目录，执行shell命令

~/software/spark-2.4.4-bin-hadoop2.6/bin/spark-submit --master spark://hadoop01:7077,hadoop02:7077,hadoop03:7077 --class com.mk.App ~/spark-test.jar

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9tYW9rdW4uYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70 1][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9tYW9rdW4uYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70 2][]

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