Book Image

Fast Data Processing with Spark 2 - Third Edition

By : Holden Karau
Book Image

Fast Data Processing with Spark 2 - Third Edition

By: Holden Karau

Overview of this book

When people want a way to process big data at speed, Spark is invariably the solution. With its ease of development (in comparison to the relative complexity of Hadoop), it’s unsurprising that it’s becoming popular with data analysts and engineers everywhere. Beginning with the fundamentals, we’ll show you how to get set up with Spark with minimum fuss. You’ll then get to grips with some simple APIs before investigating machine learning and graph processing – throughout we’ll make sure you know exactly how to apply your knowledge. You will also learn how to use the Spark shell, how to load data before finding out how to build and run your own Spark applications. Discover how to manipulate your RDD and get stuck into a range of DataFrame APIs. As if that’s not enough, you’ll also learn some useful Machine Learning algorithms with the help of Spark MLlib and integrating Spark with R. We’ll also make sure you’re confident and prepared for graph processing, as you learn more about the GraphX API.
Table of Contents (18 chapters)
Fast Data Processing with Spark 2 Third Edition
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface

Shared Java and Scala APIs


Once you have a SparkSession object created, it will serve as your main entry point. In the next chapter, you will learn how to use the SparkSession object to load and save data. You can also use SparkSession.SparkContext to launch more Spark jobs and add or remove dependencies. Some of the non-data-driven methods you can use on the SparkSession.SparkContext object are shown here:

Method

Use

addJar(path)

This method adds the JAR file for all the future jobs that would run through the SparkContext object.

addFile(path)

This method downloads the file to all the nodes on the cluster.

listFiles/listJars

This method shows the list of all the currently added files/JARs.

stop()

This method shuts down SparkContext.

clearFiles()

This method removes the files so that new nodes will not download them.

clearJars()

This method removes the JARs from being required for future jobs.