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Mastering Apache Spark 2.x - Second Edition

You're reading from Mastering Apache Spark 2.x - Second Edition

Product type Book

Published in Jul 2017

Publisher Packt

ISBN-13 9781786462749

Pages 354 pages

Edition 2nd Edition

Languages

Concepts

Table of Contents (21) Chapters

Title Page

Credits

About the Author

About the Reviewer

www.PacktPub.com

Customer Feedback

Preface

1. A First Taste and What’s New in Apache Spark V2

2. Apache Spark SQL

3. The Catalyst Optimizer

4. Project Tungsten

5. Apache Spark Streaming

6. Structured Streaming

7. Apache Spark MLlib

8. Apache SparkML

9. Apache SystemML

10. Deep Learning on Apache Spark with DeepLearning4j and H2O

11. Apache Spark GraphX

12. Apache Spark GraphFrames

13. Apache Spark with Jupyter Notebooks on IBM DataScience Experience

14. Apache Spark on Kubernetes

DataFrames

We have already used DataFrames in previous examples; it is based on a columnar format. Temporary tables can be created from it but we will expand on this in the next section. There are many methods available to the data frame that allow data manipulation and processing.

Let's start with a simple example and load some JSON data coming from an IoT sensor on a washing machine. We are again using the Apache Spark DataSource API under the hood to read and parse JSON data. The result of the parser is a data frame. It is possible to display a data frame schema as shown here:

As you can see, this is a nested data structure. So, the doc field contains all the information that we are interested in, and we want to get rid of the meta information that Cloudant/ApacheCouchDB added to the original JSON file. This can be accomplished by a call to the select method on the DataFrame:

This is the first time that we are using the DataFrame API for data processing. Similar to RDDs, a set of methods...

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