在Intellij IDEA 中編寫WordCount程序並打包到集羣測試

在前面兩篇博客的基礎上：

https://blog.csdn.net/weixin_40096730/article/details/102782195

https://blog.csdn.net/weixin_40096730/article/details/89921176

package com.likexinTest.BigData.Spark

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

object WordCount{
  def main(args: Array[String]): Unit = {

    //1.創建 SparkConf 並設置 App 名稱
    val conf = new SparkConf().setAppName("WC")
    //2.創建 SparkContext，該對象是提交 Spark App 的入口
    val sc = new SparkContext(conf)
    //3.使用 sc 創建 RDD 並執行相應的 transformation 和 action
//    sc.textFile(args(0)).flatMap(_.split("  ")).map((_,
//      1)).reduceByKey(_+_, 1).sortBy(_._2, false).saveAsTextFile(args(1))

    //讀取數據
    val line = sc.textFile(args(0))
    //壓平
    val words = line.flatMap(_.split(" "))
    //map(word,1)
    val k2v = words.map((_,1))
    //reduceByKey(word,x)
    val result = k2v.reduceByKey(_+_)
    //展示輸出
    result.saveAsTextFile(args(1))

    //4.關閉連接
    sc.stop()
  }
}

pom.xml文件

<?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.LikexinTest1</groupId>
    <artifactId>SparkDemo1</artifactId>
    <version>1.0</version>

    <dependencies>
        <dependency>
            <groupId>org.apache.spark</groupId>
            <artifactId>spark-core_2.11</artifactId>
            <version>2.1.1</version>
        </dependency>
    </dependencies>
    <build>
        <finalName>WordCount</finalName>
        <plugins>
            <plugin>
                <groupId>net.alchim31.maven</groupId>
                <artifactId>scala-maven-plugin</artifactId>
                <version>3.2.2</version>
                <executions>
                    <execution>
                        <goals>
                            <goal>compile</goal>
                            <goal>testCompile</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-assembly-plugin</artifactId>
                <version>3.0.0</version>
                <configuration>
                    <archive>
                        <manifest>
                            <mainClass>WordCount</mainClass>
                        </manifest>
                    </archive>
                    <descriptorRefs>
                        <descriptorRef>jar-with-dependencies</descriptorRef>
                    </descriptorRefs>
                </configuration>
                <executions>
                    <execution>
                        <id>make-assembly</id>
                        <phase>package</phase>
                        <goals>
                            <goal>single</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>

</project>

打包工程！！

這裏出現了error: scala.reflect.internal.MissingRequirementError: object java.lang.Object in compiler mirror not found.錯誤

這裏將JDK的路徑選擇好，（安裝JDK後選擇會自動識別路徑）

打包完成！！！

將jar包存入服務器目錄：

在IDEA中將自己的object選擇copy refrence

現在讀取hdfs上的測試文檔，wordcount結果輸出到out目錄：

運行spark-submit

bin/spark-submit \
--class com.likexinTest.BigData.Spark.WordCount \
--master yarn \
--deploy-mode client \
/usr/local/BigDataApp/spark-2.1.1-bin-hadoop2.7/likexinTest/WordCount-jar-with-dependencies.jar \
hdfs://192.168.187.100:9000/hello.txt \
hdfs://192.168.187.100:9000/out

輸出結果：

將part-00000和part-00001都下載下來並查看，每次結果都一樣但是兩個part的數據量可能不一致。