Douglas Eadline, PhD, began his career as a practitioner and a chronicler of the Linux cluster HPC revolution and now documents big data analytics. Starting with the first Beowulf Cluster how-to document, Doug has written hundreds of articles, white papers, and instructional documents covering High Performance Computing (HPC) and Data Analytics. Prior to starting and editing the popular ClusterMonkey.net website in 2005, he served as editor-in-chief for ClusterWorld Magazine, and was senior HPC editor for Linux Magazine. Currently, he is a writer and consultant to the HPC/Data Analytics industry and leader of the Limulus Personal Cluster Project. He is author of Hadoop Fundamentals LiveLessons and Apache Hadoop YARN Fundamentals LiveLessons videos from Pearson, and book coauthor of Apache Hadoop YARN: Moving beyond MapReduce and Batch Processing with Apache Hadoop 2 and Practical Data Science with Hadoop and Spark: Designing and Building Effective Analytics at Scale. He is also the sole author of Hadoop 2 Quick Start Guide: Learn the Essentials of Big Data Computing in the Apache Hadoop 2 Ecosystem.