A Simple Application in Spark and Scala

In this blog, we will see how to build a Simple Application in Spark and Scala using sbt.

Spark is a Map-Reduce like cluster computing framework, designed to make data analytics fast.

In this application we will count the number of lines containing “the”. To build this application we are going to use Spark 0.9.1, Scala 2.10.3 & sbt 0.13.0.

Before start building this application follow these instructions :-

1). Download Spark 0.9.1.

2). Unzip the binary package in any directory.

3). Go to the Spark directory.

4) Run ./sbt/sbt assembly

To successfully build Spark with sbt we need sbt 0.13.0 or later versions already installed in system.

After building Spark, we can start building the Application.

To build the Application follow these steps:

1). Run mkdir SimpleSparkProject.

2). Create a .sbt file in SimpleSparkProject/simple.sbt

name := "Simple Project"

version := "1.0"

scalaVersion := "2.10.3"

libraryDependencies += "org.apache.spark" %% "spark-core" % "0.9.1"

resolvers += "Akka Repository" at "http://repo.akka.io/releases/"

3). Create a file SimpleSparkProject/src/main/scala/SimpleApp.scala

import org.apache.spark.SparkContext
import org.apache.spark.SparkContext._

object SimpleApp {
def main(args: Array[String]) {
val logFile = "src/data/sample.txt"
val sc = new SparkContext("local", "Simple App", "/path/to/spark-0.9.1-incubating",
List("target/scala-2.10/simple-project_2.10-1.0.jar"))
val logData = sc.textFile(logFile, 2).cache()
val numTHEs = logData.filter(line => line.contains("the")).count()
println("Lines with the: %s".format(numTHEs))
}
}

4). Then go to SimpleSparkProject directory.

5). Run  sbt package

6). Run sbt run

To download a Demo Application click here.