Proper SBT Setup for Scala 2.10 and Spark Streaming

The first step on your way to building Spark Jobs in Scala is to setup your project.   Below is a listing of a proper directory structure and SBT build files.

Directory

project
   build.properties
   assembly.sbt
   plugins.sbt

build.sbt

src/main/scala

src/main/resources

To Assembly Our Jar for Spark, sbt assembly. The first time, I like to do sbt clean assembly.   For my example, it is assumed you have Scala 2.10.x on MacOSX or Linux with Spark 1.6 installed.

build.sbt

name := "MySparkScala"

version := "1.0"

scalaVersion := "2.10.5"

// Configure JAR used with the assembly plug-in
jarName in assembly := "MySparkScala.jar"

ivyScala := ivyScala.value map { _.copy(overrideScalaVersion = true) }

libraryDependencies  ++= Seq(

  "org.apache.ignite" % "ignite-spark_2.10" % "1.4.0",
  "org.apache.ignite" % "ignite-spring" % "1.4.0",
  "org.apache.spark" % "spark-core_2.10" % "1.4.1" % "provided",
  "org.apache.spark" % "spark-sql_2.10" % "1.4.1" % "provided",
  "org.scalanlp" %% "breeze-viz" % "0.11.2",
  "com.github.nscala-time" %% "nscala-time" % "2.2.0",
  "org.apache.commons" % "commons-math3" % "3.5" % "provided"
)

assemblyOption in assembly := (assemblyOption in assembly).value.copy(includeScala = false)

resolvers ++= Seq(
  "Sonatype Releases" at "https://oss.sonatype.org/content/repositories/releases/"
)

mergeStrategy in assembly := {
  case m if m.toLowerCase.endsWith("manifest.mf")          => MergeStrategy.discard
  case m if m.toLowerCase.matches("meta-inf.*\\.sf$")      => MergeStrategy.discard
  case "log4j.properties"                                  => MergeStrategy.discard
  case m if m.toLowerCase.startsWith("meta-inf/services/") => MergeStrategy.filterDistinctLines
  case "reference.conf"                                    => MergeStrategy.concat
  case _                                                   => MergeStrategy.first
}

build.properties

sbt.version = 0.13.8%

assembly.sbt

addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "0.11.2")

That's how to start, and you're ready to build your first Scala-based Apache Spark application.