Spark第一個應用

本文的主線 環境 => 開發 => 打包 => 提交

本文的示例代碼參考sparkapp

環境

cd /opt/services

wget https://downloads.lightbend.com/scala/2.11.8/scala-2.11.8.tgz

tar xf scala-2.11.8.tgz

mv scala-2.11.8 scala

vim ~/.zshrc
# export PATH=$PATH:/opt/services/scala/bin

. ~/.zshrc

scala -version
# Scala code runner version 2.11.8 -- Copyright 2002-2016, LAMP/EPFL

開發

mkdir sparkapp

mkdir -p sparkapp/src/main/scala

vim sparkapp/src/main/scala/SimpleApp.scala

/* SimpleApp.scala */
import org.apache.spark.SparkContext
import org.apache.spark.SparkContext._
import org.apache.spark.SparkConf

object SimpleApp {
    def main(args: Array[String]) {
        val logFile = "file:///opt/services/spark/README.md"
        val conf = new SparkConf().setAppName("Simple Application")
        val sc = new SparkContext(conf)
        val logData = sc.textFile(logFile, 2).cache()
        val numAs = logData.filter(line => line.contains("a")).count()
        val numBs = logData.filter(line => line.contains("b")).count()
        println("Lines with a: %s, Lines with b: %s".format(numAs, numBs))
    }
}

打包

cd /opt/services/

wget https://github.com/sbt/sbt/releases/download/v1.4.7/sbt-1.4.7.tgz

tar xf sbt-1.4.7.tgz.tgz

vim ~/.sbt/repositories

[repositories]
    local
    huaweicloud-maven: https://repo.huaweicloud.com/repository/maven/
    maven-central: https://repo1.maven.org/maven2/
    sbt-plugin-repo: https://repo.scala-sbt.org/scalasbt/sbt-plugin-releases, [organization]/[module]/(scala_[scalaVersion]/)(sbt_[sbtVersion]/)[revision]/[type]s/[artifact](-[classifier]).[ext]

vim ~/.zshrc
# export PATH=$PATH:/opt/services/sbt/bin

. ~/.zshrc

sbt -version

vim sparkapp/simple.sbt

name := "Simple Project"
version := "1.0"
scalaVersion := "2.11.8"
libraryDependencies += "org.apache.spark" %% "spark-core" % "2.1.0"

cd sparkapp

sbt package
# target/scala-2.11/simple-project_2.11-1.0.jar

提交

詳細參考Spark搭建 之 單機模式

/opt/services/spark/bin/spark-submit --class "SimpleApp" target/scala-2.11/simple-project_2.11-1.0.jar
# Lines with a: 61, Lines with b: 30