Conventions

In this book, you will find a number of text styles that distinguish between different kinds of information. Here are some examples of these styles and an explanation of their meaning.

Code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles are shown as follows: "Spark places user scripts to run Spark in the bin directory."

A block of code is set as follows:

val conf = new SparkConf()
.setAppName("Test Spark App")
.setMaster("local[4]")
val sc = new SparkContext(conf)

Any command-line input or output is written as follows:

>tar xfvz spark-2.1.0-bin-hadoop2.7.tgz
>cd spark-2.1.0-bin-hadoop2.7

New terms and important words are shown in bold. Words that you see on the screen, for example, in menus or dialog boxes, appear in the text like this: "These can be obtained from the AWS homepage by clicking Account | Security Credentials | Access Credentials."

Warnings or important notes appear in a box like this.

Tips and tricks appear like this.