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Learning PySpark

Learning PySpark

By : Drabas, Lee
3.9 (194)
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Learning PySpark

Learning PySpark

3.9 (194)
By: Drabas, Lee

Overview of this book

Apache Spark is an open source framework for efficient cluster computing with a strong interface for data parallelism and fault tolerance. This book will show you how to leverage the power of Python and put it to use in the Spark ecosystem. You will start by getting a firm understanding of the Spark 2.0 architecture and how to set up a Python environment for Spark. You will get familiar with the modules available in PySpark. You will learn how to abstract data with RDDs and DataFrames and understand the streaming capabilities of PySpark. Also, you will get a thorough overview of machine learning capabilities of PySpark using ML and MLlib, graph processing using GraphFrames, and polyglot persistence using Blaze. Finally, you will learn how to deploy your applications to the cloud using the spark-submit command. By the end of this book, you will have established a firm understanding of the Spark Python API and how it can be used to build data-intensive applications.
Table of Contents (13 chapters)
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12
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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