基于Intellij IDEA搭建Spark开发环境搭建
基于Intellij IDEA搭建Spark开发环境搭——参考文档
● 参考文档
● 操作步骤
·a)创建maven 项目
·b)引入依赖(Spark 依赖、打包插件等等)
基于Intellij IDEA搭建Spark开发环境—maven vs sbt
● 哪个熟悉用哪个
● Maven也可以构建scala项目
基于Intellij IDEA搭建Spark开发环境搭—maven构建scala项目
● 参考文档
● 操作步骤
a)用maven构建scala项目(基于net.alchim31.maven:scala-archetype-simple)
b)pom.xml引入依赖(spark依赖、打包插件等等)
在pom.xml文件中的合适位置添加以下内容:
org.apache.spark spark-core_2.11 2.2.0 provided //设置作用域,不将所有依赖文件打包到最终的项目中org.apache.maven.plugins maven-shade-plugin 2.4.1 package shade false
进行一次打包操作以测试是否工作正常。
在Terminal中输入指令:
mvn clean package运行结果如下:D:\Code\JavaCode\sparkMaven>mvn clean package [INFO] Scanning for projects...[INFO][INFO] ---------------------< com.zimo.spark:scala-spark >---------------------[INFO] Building scala-spark 1.0-SNAPSHOT[INFO] --------------------------------[ jar ]---------------------------------[INFO][INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ scala-spark ---[INFO][INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ scala-spark ---[WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent![INFO] skip non existing resourceDirectory D:\Code\JavaCode\sparkMaven\src\main\resources[INFO][INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ scala-spark ---[INFO] No sources to compile[INFO][INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ scala-spark ---[WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent![INFO] skip non existing resourceDirectory D:\Code\JavaCode\sparkMaven\src\test\resources[INFO][INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ scala-spark ---[INFO] No sources to compile[INFO][INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ scala-spark ---[INFO] No tests to run.[INFO][INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ scala-spark ---[WARNING] JAR will be empty - no content was marked for inclusion![INFO] Building jar: D:\Code\JavaCode\sparkMaven\target\scala-spark-1.0-SNAPSHOT.jar[INFO][INFO] --- maven-shade-plugin:2.4.1:shade (default) @ scala-spark ---[INFO] Replacing original artifact with shaded artifact.[INFO] Replacing D:\Code\JavaCode\sparkMaven\target\scala-spark-1.0-SNAPSHOT.jar with D:\Code\JavaCode\sparkMaven\target\scala-spark-1.0-SNAPSHOT-shaded.jar[INFO] ------------------------------------------------------------------------[INFO] BUILD SUCCESS[INFO] ------------------------------------------------------------------------[INFO] Total time: 9.675 s[INFO] Finished at: 2018-09-11T15:33:53+08:00[INFO] ------------------------------------------------------------------------
出现了BUILD SUCCESS,表明一切正常。下面给大家演示以下Scala编程的大致流程,以及在该框架下同样用Java进行实现应该如何操作。
Scala编程实现WordCount
注意:此处必须选为Object,否则没有main方法!
然后输入以下代码,执行打包操作
def main(args: Array[String]): Unit = { println("hello spark")}
完成后可以看到项目目录下多出来了一个target目录。这就是使用Scala编程的一个大致流程,下面我们来写一个WordCount程序。(后面也会有Java编程的版本提供给大家)
首先在集群中创建以下目录和测试文件:
[hadoop@masternode ~]$ cd /home/hadoop/[hadoop@masternode ~]$ lltotal 68drwxr-xr-x. 9 hadoop hadoop 4096 Sep 10 22:15 appdrwxrwxr-x. 6 hadoop hadoop 4096 Aug 17 10:42 datadrwxr-xr-x. 2 hadoop hadoop 4096 Apr 17 10:03 Desktopdrwxr-xr-x. 2 hadoop hadoop 4096 Apr 17 10:03 Documentsdrwxr-xr-x. 2 hadoop hadoop 4096 Apr 17 10:03 Downloadsdrwxr-xr-x. 2 hadoop hadoop 4096 Apr 17 10:03 Musicdrwxr-xr-x. 2 hadoop hadoop 4096 Apr 17 10:03 Picturesdrwxr-xr-x. 2 hadoop hadoop 4096 Apr 17 10:03 Publicdrwxr-xr-x. 2 hadoop hadoop 4096 Apr 17 10:03 Templatesdrwxrwxr-x. 3 hadoop hadoop 4096 Apr 18 10:11 toolsdrwxr-xr-x. 2 hadoop hadoop 4096 Apr 17 10:03 Videos-rw-rw-r--. 1 hadoop hadoop 20876 Apr 20 18:03 zookeeper.out[hadoop@masternode ~]$ mkdir testSpark/[hadoop@masternode ~]$ lltotal 72drwxr-xr-x. 9 hadoop hadoop 4096 Sep 10 22:15 appdrwxrwxr-x. 6 hadoop hadoop 4096 Aug 17 10:42 datadrwxr-xr-x. 2 hadoop hadoop 4096 Apr 17 10:03 Desktopdrwxr-xr-x. 2 hadoop hadoop 4096 Apr 17 10:03 Documentsdrwxr-xr-x. 2 hadoop hadoop 4096 Apr 17 10:03 Downloadsdrwxr-xr-x. 2 hadoop hadoop 4096 Apr 17 10:03 Musicdrwxr-xr-x. 2 hadoop hadoop 4096 Apr 17 10:03 Picturesdrwxr-xr-x. 2 hadoop hadoop 4096 Apr 17 10:03 Publicdrwxr-xr-x. 2 hadoop hadoop 4096 Apr 17 10:03 Templatesdrwxrwxr-x. 2 hadoop hadoop 4096 Sep 12 10:23 testSparkdrwxrwxr-x. 3 hadoop hadoop 4096 Apr 18 10:11 toolsdrwxr-xr-x. 2 hadoop hadoop 4096 Apr 17 10:03 Videos-rw-rw-r--. 1 hadoop hadoop 20876 Apr 20 18:03 zookeeper.out[hadoop@masternode ~]$ cd testSpark/[hadoop@masternode testSpark]$ vi word.txtapache hadoop spark scalaapache hadoop spark scalaapache hadoop spark scalaapache hadoop spark scala
WordCount.scala代码如下:(如果右键New下面没有“Scala Class“”选项,请检查IDEA是否添加了scala插件)
package com.zimo.sparkimport org.apache.spark.{SparkConf, SparkContext}/** * Created by Zimo on 2018/9/11 */object MyWordCount { def main(args: Array[String]): Unit = { //参数检查 if (args.length < 2) { System.err.println("Usage: myWordCount
从代码可以看出scala的优势就是简洁,但是可读性较差。所以,学习可以与后面的java代码进行对比。
然后打包
打包完成后把上图中的文件上传到spark集群上去,然后执行。
[hadoop@masternode testSpark]$ rz [hadoop@masternode testSpark]$ lltotal 8-rw-r--r--. 1 hadoop hadoop 1936 Sep 12 10:59 scala-spark-1.0-SNAPSHOT.jar-rw-rw-r--. 1 hadoop hadoop 104 Sep 12 10:26 word.txt[hadoop@masternode testSpark]$ cd ../app/spark-2.2.0/[hadoop@masternode spark-2.2.0]$ cd bin/[hadoop@masternode bin]$ lltotal 92-rwxr-xr-x. 1 hadoop hadoop 1089 Jul 1 2017 beeline-rw-r--r--. 1 hadoop hadoop 899 Jul 1 2017 beeline.cmd-rwxr-xr-x. 1 hadoop hadoop 1933 Jul 1 2017 find-spark-home-rw-r--r--. 1 hadoop hadoop 1909 Jul 1 2017 load-spark-env.cmd-rw-r--r--. 1 hadoop hadoop 2133 Jul 1 2017 load-spark-env.sh-rwxr-xr-x. 1 hadoop hadoop 2989 Jul 1 2017 pyspark-rw-r--r--. 1 hadoop hadoop 1493 Jul 1 2017 pyspark2.cmd-rw-r--r--. 1 hadoop hadoop 1002 Jul 1 2017 pyspark.cmd-rwxr-xr-x. 1 hadoop hadoop 1030 Jul 1 2017 run-example-rw-r--r--. 1 hadoop hadoop 988 Jul 1 2017 run-example.cmd-rwxr-xr-x. 1 hadoop hadoop 3196 Jul 1 2017 spark-class-rw-r--r--. 1 hadoop hadoop 2467 Jul 1 2017 spark-class2.cmd-rw-r--r--. 1 hadoop hadoop 1012 Jul 1 2017 spark-class.cmd-rwxr-xr-x. 1 hadoop hadoop 1039 Jul 1 2017 sparkR-rw-r--r--. 1 hadoop hadoop 1014 Jul 1 2017 sparkR2.cmd-rw-r--r--. 1 hadoop hadoop 1000 Jul 1 2017 sparkR.cmd-rwxr-xr-x. 1 hadoop hadoop 3017 Jul 1 2017 spark-shell-rw-r--r--. 1 hadoop hadoop 1530 Jul 1 2017 spark-shell2.cmd-rw-r--r--. 1 hadoop hadoop 1010 Jul 1 2017 spark-shell.cmd-rwxr-xr-x. 1 hadoop hadoop 1065 Jul 1 2017 spark-sql-rwxr-xr-x. 1 hadoop hadoop 1040 Jul 1 2017 spark-submit-rw-r--r--. 1 hadoop hadoop 1128 Jul 1 2017 spark-submit2.cmd-rw-r--r--. 1 hadoop hadoop 1012 Jul 1 2017 spark-submit.cmd
[hadoop@masternode testSpark]$ ./spark-submit --class com.zimo.spark.MyWordCount ~/testSpark/scala-spark-1.0-SNAPSHOT.jar ~/testSpark/word.txt ~/testSpark/
运行结果如下图所示:
以上操作是把结果直接打印出来,下面我们尝试一下将结果保存到文本当中去。修改以下代码:
//进行相关计算//lines.flatMap(_.split(" ")).map((_,1)).reduceByKey(_+_).collect().foreach(println)val resultRDD = lines.flatMap(_.split(" ")).map((_,1)).reduceByKey(_+_)//保存结果resultRDD.saveAsTextFile(output)
再次执行:
./spark-submit --class com.zimo.spark.MyWordCount ~/testSpark/scala-spark-1.0-SNAPSHOT.jar ~/testSpark/word.txt ~/testSpark/result //输出目录一定要为不存在的目录!
结果如下:
[hadoop@masternode testSpark]$ lltotal 5460drwxrwxr-x. 2 hadoop hadoop 4096 Sep 12 16:02 result-rw-r--r--. 1 hadoop hadoop 5582827 Sep 12 16:00 scala-spark-1.0-SNAPSHOT.jar-rw-rw-r--. 1 hadoop hadoop 104 Sep 12 15:52 word.txt[hadoop@masternode testSpark]$ cd result/[hadoop@masternode result]$ lltotal 4-rw-r--r--. 1 hadoop hadoop 42 Sep 12 16:02 part-00000-rw-r--r--. 1 hadoop hadoop 0 Sep 12 16:02 _SUCCESS[hadoop@masternode result]$ cat part-00000(scala,4)(spark,4)(hadoop,4)(apache,4)
Java编程实现WordCount
在同样目录新建一个java目录,并设置为”Sources Root”。
单元测试目录”test”同样需要建一个java文件夹。
同理设置为”Test Sources Root”。然后分别再创建resources目录(用于存放配置文件),并分别设置为“Resources Root”和“Test Resources Root”。
最后,创建一个“com.zimo.spark”包,并在下面新建一个MyJavaWordCount.Class类(如果右键New下面没有“Java Class”选项请参看博文下的详细讲解),其中的代码为如下:
package com.zimo.spark;import org.apache.spark.SparkConf;import org.apache.spark.api.java.JavaPairRDD;import org.apache.spark.api.java.JavaRDD;import org.apache.spark.api.java.JavaSparkContext;import org.apache.spark.api.java.function.FlatMapFunction;import org.apache.spark.api.java.function.Function2;import org.apache.spark.api.java.function.PairFunction;import scala.Tuple2;import java.util.Arrays;import java.util.Iterator;/** * Created by Zimo on 2018/9/12 */public class MyJavaWordCount { public static void main(String[] args) { //参数检查 if (args.length < 2) { System.err.println("Usage: MyJavaWordCount
注意:此处要做一点点修改。注释掉pom.xml文件下的此处内容
此处是默认Source ROOT的路径,所以打包时就只能打包Scala下的代码,而我们新建的Java目录则不会被打包,注释之后则会以我们之前的目录配置为主。
然后就可以执行打包和集群上的运行操作了。运行和Scala编程一模一样,我在这里就不赘述了,大家参见上面即可!只是需要注意一点:output目录必须为不存在的目录,请记得每次运行前进行修改!
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