What you need for this book
This book is based on open source software. First, it's Java. One can download Java from Oracle's Java Download page. You have to accept the license and choose an appropriate image for your platform. Don't use OpenJDK—it has a few problems with Hadoop/Spark.
Second, Scala. If you are using Mac, I recommend installing Homebrew:
$ ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
Multiple open source packages will also be available to you. To install Scala, run brew install scala. Installation on a Linux platform requires downloading an appropriate Debian or RPM package from the http://www.scala-lang.org/download/ site. We will use the latest version at the time, that is, 2.11.7. ...
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