Spark入门（三）Idea构建spark项目

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>
    <!-- scala依赖-->
    <dependency>
      <groupId>org.scala-lang</groupId>
      <artifactId>scala-library</artifactId>
      <version>${scala.version}</version>
    </dependency>

    <!-- spark依赖-->
    <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

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