Sbt | Learn for Master

Sbt | Learn for Master

A Spark program using Scopt to Parse Arguments

July 29, 2016 Author: david
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To develop a Spark program, we often need to read arguments from the command line. Scopt is a popular and easy-to-use argument parser. In this post, I provide a workable example to show how to use the scopt parser to read arguments for a spark program in scala. Then I describe how to run the spark job in yarn-cluster mode.

The main contents of this post include:
1. Use scopt option parser to parse arguments for a scala program.
2. Use sbt to package the scala program
3. Run spark on yarn-cluster mode with third party libraries
Use Scopt to parse arguments in a scala program

In the following program,
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How to package a Scala project to a Jar file with SBT

June 29, 2016 Author: david
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When you develop a Spark project using Scala language, you have to package your project into a jar file. This tutorial describes how to use SBT
to compile and run a Scala project, and package the project as a Jar file. This will be helpful for you to create a spark project and package it to a jar file.

The directory structure of a typical SBT project

Here is an example to show a typical SBT project, which has the following directory structures.
```
.
|-- build.sbt
|-- lib
|-- project
|-- src
|   |-- main
|   |   |-- java (store main java files)
|   |   |-- resources (store include in main jar)
|   |   |-- scala (store main Scala source files)
|   |-- test
|       |-- java (store test java files)
|       |-- resources (store files include in test jar)
|       |-- scala (store test scala source files)
|-- target
```
You can use the following command to create this directory structures:
```
#!/bin/sh
cd ~/hello_world
mkdir -p src/{main,test}/{java,resources,scala}
mkdir lib project target

# create an initial build.sbt file
echo 'name := "MyProject"
version := "1.0"
scalaVersion := "2.10.0"' >
```
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