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Learning PySpark

You're reading from   Learning PySpark Build data-intensive applications locally and deploy at scale using the combined powers of Python and Spark 2.0

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Product type Paperback
Published in Feb 2017
Publisher Packt
ISBN-13 9781786463708
Length 274 pages
Edition 1st Edition
Languages
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Authors (2):
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Denny Lee Denny Lee
Author Profile Icon Denny Lee
Denny Lee
Tomasz Drabas Tomasz Drabas
Author Profile Icon Tomasz Drabas
Tomasz Drabas
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Table of Contents (13) Chapters Close

Preface 1. Understanding Spark FREE CHAPTER 2. Resilient Distributed Datasets 3. DataFrames 4. Prepare Data for Modeling 5. Introducing MLlib 6. Introducing the ML Package 7. GraphFrames 8. TensorFrames 9. Polyglot Persistence with Blaze 10. Structured Streaming 11. Packaging Spark Applications Index

Chapter 3. DataFrames

A DataFrame is an immutable distributed collection of data that is organized into named columns analogous to a table in a relational database. Introduced as an experimental feature within Apache Spark 1.0 as SchemaRDD, they were renamed to DataFrames as part of the Apache Spark 1.3 release. For readers who are familiar with Python Pandas DataFrame or R DataFrame, a Spark DataFrame is a similar concept in that it allows users to easily work with structured data (for example, data tables); there are some differences as well so please temper your expectations.

By imposing a structure onto a distributed collection of data, this allows Spark users to query structured data in Spark SQL or using expression methods (instead of lambdas). In this chapter, we will include code samples using both methods. By structuring your data, this allows the Apache Spark engine – specifically, the Catalyst Optimizer – to significantly improve the performance of Spark...

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