Installing SBT and compiling Scala programs in Linux __linux

SBT Introduction
SBT is a code compilation tool, is the Scala world mvn, can compile Scala,java, etc., need java1.6 above.

SBT Project Environment Establishment
SBT compilation requires a fixed directory format, and requires networking, SBT will download the dependent jar package to the user's home. Ivy2 below, the directory structure is as follows:
|--build.sbt
|--lib
|--project
|--src
| |--main
|    | |--scala
| |--test
| |--scala
|--sbt
|--target Copy code above to create a directory as follows:
Mkdir-p ~/spark_wordcount/lib
Mkdir-p ~/spark_wordcount/project
Mkdir-p ~/spark_wordcount/src/main/scala
Mkdir-p ~/spark_wordcount/src/test/scala
Mkdir-p ~/spark_wordcount/target Copy Code


1, download SBT Universal Platform Compression package: Sbt-0.13.5.tgz http://www.scala-sbt.org/download.html 2, build directory, extract files to the established directory $ sudo mkdir/usr/local/sbt$ $ sudo tar-zxvf sbt-0.13.5.tgz-c/usr/local 3, set up a boot SBT script file $ cd/usr/local/sbt/$ vim SBT/* Add SBT to the sbt_opts= text file-xms5 12m-xmx1536m-xss1m-xx:+cmsclassunloadingenabled-xx:maxpermsize=256m "Java $SBT _opts-jar/usr/local/sbt/bin/ Sbt-launch.jar "$@"
4, modify SBT file permissions $ chmod u+x SBT
5, configure the PATH environment variable, to ensure that the console can use the SBT command $ vim ~/.BASHRC/* At the end of the file add the following code, save exit/export path=/opt/scala/sbt/: $PATH
6./* Make the configuration file effective immediately/$ source ~/.BASHRC 7, test SBT whether the installation is successful/* First execution, will download some packages, and then normal use, to ensure that the network, installation after the successful display of the following * * * $ SBT sbt-version [INFO] Set current project to SBT (in Build file:/opt/scala/sbt/) [INFO] 0.13.5
8. Create Scala file import Org.apache.spark.SparkContext under project_home/src/main/scala/
Import Org.apache.spark.sparkcontext._
Import org.apache.spark.SparkConf

Object Simpleapp
{
def main (args:array[string])
{
Val logFile = "/usr/local/spark-1.5.2/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))
}
}

9, under project_home/edit SIMPLE.SBT Name: = "Simple Project"
Version: = "1.0"
Scalaversion: = "2.10.4"
Librarydependencies + + "Org.apache.spark"% "Spark-core"% "1.0.2"
resolvers + = "Akka Repository" at "http://repo.akka.io/releases/"
10, compile package in Project_home directory run: SBT package
11, submitted to run Spark_home/bin/spark-submit--class "Simpleapp"--master Local[4]/project_home/target/scala-2.10/ Simple-project_2.10-1.0.jar