In this book, you will find a number of styles of text 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: "The tarball file contains a bin directory that needs to be added to your path and SCALA_HOME should be set to the path where the tarball is extracted."

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

./run spark.examples.GroupByTest local[4]

New terms and important words are shown in bold. Words that you see on the screen, in menus or dialog boxes for example, appear in the text like this: "by selecting Key Pairs under Network & Security".