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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Spark & Scala Workshop Exercises</title>
<meta name="description" content="The Exercises for Spark & Scala Workshop">
<meta name="author" content="Jacek Laskowski">
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<body>
<div class="reveal">
<div class="slides">
<section class="intro" data-transition="zoom">
<p>
<img width="15%" style="background:none; border:none; box-shadow:none;" data-src="images/spark-logo.png">
<img width="30%" src="images/ValueAmplify_Logo_Final_medium.jpg" style="border: 0">
</p>
<h1>Spark 2.0 / Scala Workshop <small>exercises</small></h1>
<h4><a href="https://blog.jaceklaskowski.pl">Jacek Laskowski</a> / <a href="https://twitter.com/jaceklaskowski">@jaceklaskowski</a> / <a href="https://github.com/jaceklaskowski">GitHub</a> / <a href="http://bit.ly/mastering-apache-spark">Mastering Apache Spark Notes</a></h4>
</section>
<section id="agenda">
<h2>Agenda</h2>
<ol>
<li>Tools: Scala</li>
<li>Tools: IntelliJ IDEA</li>
<li>Exercises</li>
<li>Tools: sbt</li>
<li>Tools: ScalaTest</li>
<li>Exercises</li>
<li>Directory Layout Convention</li>
<li>Tools: scaladoc</li>
<li>Exercises</li>
</ol>
</section>
<section>
<h1>Tools</h1>
</section>
<section id="scala">
<h1>Scala</h1>
</section>
<section>
<h2>Scala</h2>
<section>
<h2>Hello World App</h2>
<hr />
<pre><code>
object Main extends App {
println("Hello")
}
</code></pre>
</section>
<section>
<h2>object keyword</h2>
</section>
<section>
<h2>extends keyword</h2>
</section>
<section>
<h2>println method</h2>
</section>
<section>
<h2>curly braces</h2>
</section>
<section>
<pre><code>
object Main extends App {
println("Hello")
}
</code></pre>
</section>
</section>
<section id="intellij-idea">
<h1>IntelliJ IDEA</h1>
</section>
<section>
<h2>IntelliJ IDEA</h2>
<section>
<ol>
<li>
The integrated development tool
<ul>
<li>
similar to Visual Studio
</li>
</ul>
</li>
<li>
Support for Scala
</li>
<li>
Scala Worksheet for Learning and Prototyping
</li>
<li>
"IntelliSense" Feature
</li>
<li>
Lots of Key Shortcuts
<ul>
<li>
You're going to use them quite often!
</li>
</ul>
</li>
</ol>
</section>
<section>
<ol>
<li>
Creating a Scala project
</li>
<li>
Running the Hello World application
</li>
</ol>
</section>
</section>
<section id="scalatest">
<h1>ScalaTest</h1>
</section>
<section>
<h2>ScalaTest</h2>
<section>
<ol>
<li>
Scala Testing Framework
</li>
<li>
Matchers - Assertions
</li>
<li>
sbt supports ScalaTest
<ul>
<li>
sbt test
</li>
</ul>
</li>
<li>
IntelliJ IDEA supports ScalaTest, too.
</li>
</ol>
</section>
<section>
Let's review our Scala sbt-based project
</section>
</section>
<section id="scaladoc">
<h1>Scaladoc</h1>
<h3>Scala Standard API's Documentation</h3>
</section>
<section>
<h2>Scaladoc</h2>
<section>
<ol>
<li>
Official Documentation for Scala API
</li>
<li>
<a href="https://scala-lang.org/api/current">https://scala-lang.org/api/current</a>
</li>
</ol>
</section>
</section>
<section>
<section id="exercise-1-0">
<h2>Exercise 1: WordCount using groupBy</h2>
<ul>
<li>Use Spark API scaladoc at <a href="http://spark.apache.org/docs/latest/api/scala/">http://spark.apache.org/docs/latest/api/scala</a></li>
<li>Use <b>spark-shell</b> and <b>sbt</b></li>
<li>Use <code>sc.textFile</code>, <code>flatMap</code> and <code>split</code></li>
<li>Use <code>groupBy</code> to group values per key</li>
<li>Use <code>mapValues</code> and <code>top</code></li>
<li>Print results using <code>foreach</code> and <code>println</code></li>
<li><code>sbt package</code> and deploy it to Spark Standalone.</li>
</ul>
</section>
<section id="exercise-1-solution">
<h2>Solution 1: WordCount using groupBy</h2>
<pre><code>
sc.textFile("README.md")
.flatMap(line => line.split("\\W+"))
.map(token => (token, 1))
.reduceByKey { case (x, y) => x + y }
.top(10)(Ordering.by(wc => wc._2))
.foreach(println)
</code></pre>
</section>
<section id="exercise-1-1">
<h2>Exercise 2: WordCount using reduceByKey</h2>
<ul>
<li>Use Spark API scaladoc at <a href="http://spark.apache.org/docs/latest/api/scala/">http://spark.apache.org/docs/latest/api/scala</a></li>
<li>Use <b>spark-shell</b> and <b>sbt</b></li>
<li>Use <code>sc.textFile</code>, <code>flatMap</code> and <code>split</code></li>
<li>Use <code>groupBy</code> and <code>reduceByKey</code></li>
<li>Save results using <code>saveAsTextFile</code></li>
<li><code>sbt package</code> and deploy it to Spark Standalone.</li>
</ul>
</section>
<section id="exercise-1-1-solution">
<h2>Solution 2: WordCount using reduceByKey</h2>
<pre><code>
sc.textFile("README.md")
.flatMap(line => line.split("\\W+"))
.map(token => (token, 1))
.reduceByKey { case (x, y) => x + y }
.saveAsTextFile("results.txt")
</code></pre>
</section>
</section>
<section id="exercise-2">
<section>
<h2>Exercise 3: Reading CSV file Using Dataset</h2>
<ul>
<li>
Use <b>CVS file</b> from OneDrive with the Installation Instructions.
</li>
<li>Use Spark API scaladoc at <a href="http://spark.apache.org/docs/latest/api/scala/">http://spark.apache.org/docs/latest/api/scala</a></li>
<li>Use <b>spark-shell</b> and <b>sbt</b> to write the code</li>
<li>Use <code>spark.read</code>, <code>format</code> and <code>option</code> to read a file</li>
<li>Use <code>withColumn</code> and <code>split</code></li>
<li>Use a custom case class <code>Record</code></li>
<li>Print results using <code>show</code></li>
<li><code>sbt package</code> and <code>spark-submit</code> it</li>
<li>
<b>Success:</b> You show a table 4 by 2.
</li>
</ul>
</section>
<section id="exercise-1-1-solution">
<h2>Solution 3: Reading CSV file Using Dataset</h2>
<pre><code>
spark.read.option("header", true).csv("people.csv").show
</code></pre>
</section>
</section>
<section id="thats-all" data-background-image="images/end.jpg">
<!-- THAT'S IT FOLKS -->
</section>
<section id="questions" style="text-align: left">
<h1>Questions?</h1>
<p>
- Visit <a href="https://blog.jaceklaskowski.pl">Jacek Laskowski's blog</a><br>
- Follow <a href="https://twitter.com/jaceklaskowski">@jaceklaskowski</a> at twitter<br>
- Use <a href="https://github.com/jaceklaskowski">Jacek's projects at GitHub</a><br>
- Read <a href="http://bit.ly/mastering-apache-spark">Mastering Apache Spark</a> notes.
</p>
</section>
</div>
</div>
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