scala与spark的运行命令

虽然scala与spark都源于java,但他们又有自己的语言和运行方式。

首先我们得有这两的运行环境，配置环境变量:

export HADOOP_HOME=/Users/chengzhong/Downloads/hadoop-3.3.4
export SPARK_HOME=/Users/chengzhong/work_tool_install/spark-3.0.1-bin-hadoop3.2
export PATH=$PATH:$SPARK_HOME/bin
export SCALA_HOME=/Users/chengzhong/work_tool_install/scala-2.11.12
export PATH=$PATH:$SCALA_HOME/bin

先说scala(2.11),他的main函数是这样:

object MyApp {
  def main(args : Array[String]) :Unit = {
    println("Hello Scala!") ;
  }
}

maven的pom.xml依赖是这样:

<properties>
<scala.version>2.11.12</scala.version>
</properties>



<dependencies>
<dependency>
  <groupId>org.scala-lang</groupId>
  <artifactId>scala-library</artifactId>
  <version>${scala.version}</version>
</dependency>
<dependency>
  <groupId>junit</groupId>
  <artifactId>junit</artifactId>
  <version>4.4</version>
  <scope>test</scope>
</dependency>
<dependency>
  <groupId>org.specs</groupId>
  <artifactId>specs</artifactId>
  <version>1.2.5</version>
  <scope>test</scope>
</dependency>
</dependencies>

<build>
<sourceDirectory>src/main/scala</sourceDirectory>
<testSourceDirectory>src/test/scala</testSourceDirectory>
<plugins>
  <plugin>
    <groupId>org.scala-tools</groupId>
    <artifactId>maven-scala-plugin</artifactId>
    <executions>
      <execution>
        <goals>
          <goal>compile</goal>
          <goal>testCompile</goal>
        </goals>
      </execution>
    </executions>
    <configuration>
      <scalaVersion>${scala.version}</scalaVersion>
      <args>
        <arg>-target:jvm-1.8</arg>
      </args>
    </configuration>
  </plugin>

</plugins>
</build>

<repositories>
<repository>
  <id>scala-tools.org</id>
  <name>Scala-Tools Maven2 Repository</name>
  <url>http://scala-tools.org/repo-releases</url>
</repository>
</repositories>

<pluginRepositories>
<pluginRepository>
  <id>scala-tools.org</id>
  <name>Scala-Tools Maven2 Repository</name>
  <url>http://scala-tools.org/repo-releases</url>
</pluginRepository>
</pluginRepositories>

运行命令:

scala -cp target/scala-1.0-SNAPSHOT.jar net.highersoft.MyApp

而spark一般用scala语言,maven pom.xml依赖为:

<properties>
        <!-- Maven settings -->
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <!-- Dependency versions -->
        <java.version>1.8</java.version>
        <!-- Match this with what Spark version wants -->
        <scala.minor.version>2.11</scala.minor.version>
        <scala.complete.version>${scala.minor.version}.8</scala.complete.version>
        <hadoop.version>2.7.5</hadoop.version>
        <spark.version>2.2.1</spark.version>
    </properties>

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

        <dependency>
            <groupId>org.apache.spark</groupId>
            <artifactId>spark-mllib_${scala.minor.version}</artifactId>
            <version>${spark.version}</version>
        </dependency>
        <dependency>
            <groupId>com.github.scopt</groupId>
            <artifactId>scopt_${scala.minor.version}</artifactId>
            <version>3.3.0</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.7.0</version>
                <configuration>
                    <optimize>true</optimize>
                    <showDeprecation>true</showDeprecation>
                    <showWarnings>true</showWarnings>
                    <source>${java.version}</source>
                    <target>${java.version}</target>
                    <compilerArgs>
                        <arg>-Xlint:all,-serial,-try,-options</arg>
                        <arg>-Werror</arg>
                    </compilerArgs>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-resources-plugin</artifactId>
                <version>3.0.2</version>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-source-plugin</artifactId>
                <version>3.0.1</version>
                <executions>
                    <execution>
                        <id>attach-sources</id>
                        <goals>
                            <goal>jar-no-fork</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
            <plugin>
                <groupId>net.alchim31.maven</groupId>
                <artifactId>scala-maven-plugin</artifactId>
                <version>3.2.0</version>
                <executions>
                    <execution>
                        <id>compile-scala</id>
                        <phase>compile</phase>
                        <goals>
                            <goal>add-source</goal>
                            <goal>compile</goal>
                        </goals>
                    </execution>
                    <execution>
                        <id>test-compile-scala</id>
                        <phase>test-compile</phase>
                        <goals>
                            <goal>add-source</goal>
                            <goal>testCompile</goal>
                        </goals>
                    </execution>
                </executions>
                <configuration>
                    <scalaVersion>${scala.complete.version}</scalaVersion>
                </configuration>
            </plugin>
            <plugin>
                <artifactId>maven-assembly-plugin</artifactId>
                <configuration>
                    <descriptorRefs>
                        <descriptorRef>jar-with-dependencies</descriptorRef>
                    </descriptorRefs>
                </configuration>
                <executions>
                    <execution>
                        <id>make-assembly</id> <!-- this is used for inheritance merges -->
                        <phase>package</phase> <!-- 指定在打包节点执行jar包合并操作 -->
                        <goals>
                            <goal>single</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>

而spark的运行命令，是这样:

spark-submit --class com.xx.ExplicitRecommender  target/spark-xx-example-1.0-SNAPSHOT-jar-with-dependencies.jar