Book Image

Data Ingestion with Python Cookbook

By : Gláucia Esppenchutz
Book Image

Data Ingestion with Python Cookbook

By: Gláucia Esppenchutz

Overview of this book

Data Ingestion with Python Cookbook offers a practical approach to designing and implementing data ingestion pipelines. It presents real-world examples with the most widely recognized open source tools on the market to answer commonly asked questions and overcome challenges. You’ll be introduced to designing and working with or without data schemas, as well as creating monitored pipelines with Airflow and data observability principles, all while following industry best practices. The book also addresses challenges associated with reading different data sources and data formats. As you progress through the book, you’ll gain a broader understanding of error logging best practices, troubleshooting techniques, data orchestration, monitoring, and storing logs for further consultation. By the end of the book, you’ll have a fully automated set that enables you to start ingesting and monitoring your data pipeline effortlessly, facilitating seamless integration with subsequent stages of the ETL process.
Table of Contents (17 chapters)
1
Part 1: Fundamentals of Data Ingestion
9
Part 2: Structuring the Ingestion Pipeline

Creating a SparkSession for PySpark

Previously introduced in Chapter 1, PySpark is a Spark library that was designed to work with Python. PySpark uses a Python API to write Spark functionalities such as data manipulation, processing (batch or real-time), and machine learning.

However, before ingesting or processing data using PySpark, we must initialize a SparkSession. This recipe will teach us how to create a SparkSession using PySpark and explain its importance.

Getting ready

We first need to ensure we have the correct PySpark version. We installed PySpark in Chapter 1; however, checking if we are using the correct version is always good. Run the following command:

$ pyspark –version

You should see the following output:

Welcome to
      ____              __
     / __/__  ___ _____/ /__
    _\ \/ _ \/ _...