Book Image

Learning Spark SQL

By : Aurobindo Sarkar
Book Image

Learning Spark SQL

By: Aurobindo Sarkar

Overview of this book

In the past year, Apache Spark has been increasingly adopted for the development of distributed applications. Spark SQL APIs provide an optimized interface that helps developers build such applications quickly and easily. However, designing web-scale production applications using Spark SQL APIs can be a complex task. Hence, understanding the design and implementation best practices before you start your project will help you avoid these problems. This book gives an insight into the engineering practices used to design and build real-world, Spark-based applications. The book's hands-on examples will give you the required confidence to work on any future projects you encounter in Spark SQL. It starts by familiarizing you with data exploration and data munging tasks using Spark SQL and Scala. Extensive code examples will help you understand the methods used to implement typical use-cases for various types of applications. You will get a walkthrough of the key concepts and terms that are common to streaming, machine learning, and graph applications. You will also learn key performance-tuning details including Cost Based Optimization (Spark 2.2) in Spark SQL applications. Finally, you will move on to learning how such systems are architected and deployed for a successful delivery of your project.
Table of Contents (19 chapters)
Title Page
Credits
About the Author
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface

Understanding DataFrame/Dataset APIs


A Dataset is a strongly collection of domain-specific objects that can be transformed parallelly, using functional or relational operations. Each Dataset also a view called a DataFrame, which is not strongly typed and is essentially a Dataset of row objects.

Spark SQL applies structured views to the data from different source systems stored using different data formats. Structured APIs, such as the DataFrame/Dataset API, allows developers to use a high-level API to write their programs. These APIs allow them to focus on the "what" rather than the "how" of the data processing required.

Even though applying a structure can limit what can be expressed, in practice, structured APIs can accommodate the vast majority of computations required in application development. Also, it is these very limitations (imposed by structured APIs) that present several of the main optimization opportunities.

In the next section, we will explore encoders and their role in efficient...