Apache Spark for Java Developers - Course Extract - Performance

This is an extract from the Virtual Pair Programmers Apache Spark for Java Developers course. The course will help you get started with the amazing Apache Spark parallel computing framework - this course is designed especially for Java Developers. In this chapter we answer questions such as : "how do I optimize spark?", "what is a stage in spark?", "what is a shuffle in spark?", "what does the 0 of x mean in spark?", "why to avoid groupByKey in spark?", "what is the difference between cache and persist in spark?", "why is all my data in one partition in spark?" In the full course you will learn all the fundamentals that you need to understand the main operations that you can perform in Spark Core, deploy to a live EMR hardware cluster and understand the internals of Spark and how it optimises your execution plans. You will get some great practice with Java 8 Lambdas - our most "functional" course to date! The full course is available at www.virtualpairprogrammers.com

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