Book Image

Data Engineering with Apache Spark, Delta Lake, and Lakehouse

By : Manoj Kukreja
5 (2)
Book Image

Data Engineering with Apache Spark, Delta Lake, and Lakehouse

5 (2)
By: Manoj Kukreja

Overview of this book

In the world of ever-changing data and schemas, it is important to build data pipelines that can auto-adjust to changes. This book will help you build scalable data platforms that managers, data scientists, and data analysts can rely on. Starting with an introduction to data engineering, along with its key concepts and architectures, this book will show you how to use Microsoft Azure Cloud services effectively for data engineering. You'll cover data lake design patterns and the different stages through which the data needs to flow in a typical data lake. Once you've explored the main features of Delta Lake to build data lakes with fast performance and governance in mind, you'll advance to implementing the lambda architecture using Delta Lake. Packed with practical examples and code snippets, this book takes you through real-world examples based on production scenarios faced by the author in his 10 years of experience working with big data. Finally, you'll cover data lake deployment strategies that play an important role in provisioning the cloud resources and deploying the data pipelines in a repeatable and continuous way. By the end of this data engineering book, you'll know how to effectively deal with ever-changing data and create scalable data pipelines to streamline data science, ML, and artificial intelligence (AI) tasks.
Table of Contents (17 chapters)
1
Section 1: Modern Data Engineering and Tools
5
Section 2: Data Pipelines and Stages of Data Engineering
11
Section 3: Data Engineering Challenges and Effective Deployment Strategies

Understanding isolation levels

In Delta Lake, the isolation level of a table defines the degree to which the transaction must be isolated from modifications that are being made by concurrent transactions. There are two isolation levels, as follows:

  • The Serializable isolation level is strong, which means the write and read operations exist in a serial sequence.
  • The WriteSerializable isolation level is the default. In this isolation level, only the write operations exist in a serial sequence.

We will check them out as follows:

  1. The isolation level can be queried for every transaction in history:
    %sql
    SELECT version, operation, isolationLevel
     from (DESCRIBE HISTORY store_orders);

    This results in the following output:

    Figure 6.40 – Transaction history isolationLevel

  2. Although the default isolation level for delta tables is WriteSerializable, it can be changed as desired. We can alter the isolation of the store_orders table to the Serializable isolation...