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Serverless ETL and Analytics with AWS Glue
Serverless ETL and Analytics with AWS Glue

Serverless ETL and Analytics with AWS Glue: Your comprehensive reference guide to learning about AWS Glue and its features

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Serverless ETL and Analytics with AWS Glue

Chapter 1: Data Management – Introduction and Concepts

A vast amount of data is being generated by people, organizations, devices, and software applications, and the volume of data being generated is growing rapidly. The numbers vary significantly, depending on the source, but it is estimated that approximately 60% to 80% of data gathered by organizations is dark data. Essentially, data is being collected, processed, and stored for a long time by organizations for compliance reasons, but the data is not used for any other purposes, such as analytics or direct monetization. In most cases, storing and securing this data can be more expensive than the value extracted.

In today’s digital economy, organizations are striving to be data-driven by basing their strategic business decisions on intelligence that’s been obtained from data gathered from various sources. Until recently, organizations thought of data purely in the context of transactions and locked it away in heavily siloed databases that were built for transaction processing; however, this was not suitable for open-ended analysis. All this changed with advancements in data processing techniques and drops in the costs involved in processing and analyzing data. Organizations are now adopting data-driven approaches for key business decisions.

In this chapter, we will cover the following topics:

  • Types of data processing – OLTP and OLAP
  • Data warehouses and data marts
  • Data lakes
  • Data lakehouse
  • Data mesh
  • Apache Spark on the AWS cloud
  • AWS Glue
  • Querying data using AWS

The topics in this chapter will introduce us to different data management techniques and different tools and services offered by the AWS cloud. These concepts will help you understand the different design approaches you can take to build effective data integration and management setups that are suitable to your use cases when using AWS Glue.

Types of data processing – OLTP and OLAP

Traditionally, data storage systems have been classified as Online Transaction Processing (OLTP) and Online Analytical Processing (OLAP). OLTP systems are responsible for day-to-day business executions. For instance, when you call your phone carrier’s customer service to add a new value pack to your phone plan, the customer service agent quickly pulls up the account information for your phone number and adds your desired value pack. The system that’s used by the customer service agent is designed to be fast so that the customer wait time can be minimized, which allows the customer service agent to be more efficient and serve customers faster. The system is also designed so that it updates the data quickly so that a large number of concurrent transactions can be processed. This allows the customer service agent to confirm that the value pack has been successfully applied to the account. Other examples include banking and shopping applications.

These faster updates are achieved by using a normalized data model. Normalization is the process of structuring the dataset as per a set of normal-forms to reduce redundancy and enhance data integrity. The normalized data model ensures that you don’t update multiple tables with the same information for a user operation. This is done by reducing the redundancy of the data in these systems. For example, if a customer updates their preferred_name, we can make this change in one table; the rest of the dependent tables will use customer_id to fetch updated information. So, a typical SQL query for the CRM application that’s used by the customer service agent contains the customer_id = 'xxxxxx' expression or data_plan_id = 'xxxxxx' in the WHERE clause.

These OLTP systems are not designed for obtaining or analyzing trends – for example, a query for gathering the mobile data usage (volume) of all customers over the last 2 years. Such queries involve joining a lot of tables on the OLTP side because of normalizations and usually results in poor performance as the amount of data scales up.

This problem can be solved by using OLAP systems. OLAP systems typically use the data warehouse of an organization, where they are utilized for executing complex queries over a large amount of data. They generally store historical datasets.

So, while both OLAP and OLTP have different ways of storing data and are designed for different use cases, the data on which they operate can be the same – the data is just modeled differently. Since both systems work on the same data, the data must be moved from one system to another. OLTP systems support live business transactions, so data generally originates there. This data is then brought into a data warehouse through an Extract, Transform, Load (ETL) or Extract, Load, Transform (ELT) tool so that it can then be consumed by OLAP systems. The following table explains the differences between OLTP and OLAP:

Table 1.1 – Differences between OLTP and OLAP

Table 1.1 – Differences between OLTP and OLAP

Now that we understand the fundamentals of the OLTP and OLAP models, let’s explore different data management systems, such as data warehouses, data marts, data lakes, data lakehouses, and data meshes.

Data warehouses and data marts

In an organization, it is not uncommon for day-to-day operations to be performed and stored in several transactional operating systems. However, when higher-level business decisions are to be made using data gathered from these systems, it would be easier to collate necessary information from these sources and build a centralized repository for datasets to gather actionable intelligence.

A data warehouse is a centralized repository of data that’s been gathered from various sources within an organization. The collated data within this repository is analyzed and can be used to make business decisions. A data mart, on the other hand, is a subset of a data warehouse aligned toward a specific business unit within an organization.

The concept of data warehouses was introduced in the late 1980s. Data warehouses are subject-oriented, integrated, time-variant, and non-volatile. This means that data warehouses are designed to be able to make sense of the data in a specific subject rather than ongoing operations, such as sales, marketing, and HR. Data warehouses are also designed to integrate data for several different source systems, such as Enterprise Resource Planning (ERP), Human Resource Management Systems (HRMSs), Customer Relationship Management (CRM), Financial Management Systems (FMSs), and any other operational systems within an organization. The data within a data warehouse is usually structured, but it can be unstructured as well. Data warehouses also allow users to analyze the data at different grains of time, such as year, month, and day. The data in data warehouses is non-volatile and maintains history. So, changes in the source systems result in newer entries in the data warehouses where the new state of the data is used while preserving the old state of the data.

In Inmon’s top-down data warehousing approach, data architects and modelers start by looking at the holistic data landscape of an organization and identifying the main subject areas and entities under it. Inmon’s data warehouse is normalized and avoids redundancy. This simplifies the data ingestion process but is not optimized for queries. Hence, data marts are built on top of data warehouses and users access these data marts for their queries.

While data marts can be based on a star or snowflake schema, the star schema is generally preferred because it results in faster queries due to fewer joins. In 1996, Ralph Kimball introduced the star schema methodology to the data management world. This follows the bottom-up approach and creates data marts based on the business requirements instead of starting with an enterprise data warehouse.

In a data mart, data is stored at multiple levels and the table at the correct level is picked for processing the data. The atomic level by which the facts may be defined is known as the grain or granularity of the table.

For example, let’s consider a retail sales dataset for a retail store chain operating in different countries. A customer could buy several products in a single sale and the same customer could buy higher quantities of the same product within the same sale. We can have a table that contains region information that can be linked to sales and product tables.

So, while selecting a grain, it is beneficial to have the fact table populated with the most atomic grain. This allows us to be as granular as we want with the information we query. If we define the grain at the sales transaction level, we can query individual sales transactions and get information such as the amount per sale, payment method, and so on. However, we won’t be able to get the product information in a particular sale. To mitigate this, let’s say we define the grain at the product in a sales transaction level. We can query product-related information along with sales information.

These different levels of pre-computation help us avoid heavy computations at query time. For example, if a user is querying for sales_amount at the region level, it might be far easier to select the data from the table that contains the sales_amount and region columns.

As we can see, data marts are helpful for working with datasets related to a specific context or a business line. However, a centralized data warehouse is beneficial when our analysis needs data to be aggregated from a variety of sources across the organization to extract actionable intelligence from the dataset.

A fresh approach to data warehousing came with the introduction of data vaults. This is a hybrid approach that incorporates the best-normalized model and a denormalized star schema. This approach to data modeling can be quite helpful when working with multi-source systems or data sources that have constantly changing relationships. This makes it easier to ingest data from multiple sources. Also, because of the way the data is modeled, data vaults make it easier to audit and track data.

Data transformation is a requirement for the data to be loaded into a data warehouse. This creates entry barriers and lags in delivering value to customers. Generally, organizations have multiple sources of data and they must be imported into a data warehouse to make business decisions or even to know if it adds value. Later, if the user discovers that combining the data from certain sources is not delivering the value that was initially expected, then this results in time and resources being wasted. Also, it is not always possible to forecast the analytical requirements in a world where businesses have to constantly evolve to stay relevant. What happens if a business user needs historical data that isn’t available in the data warehouse? Around 2015, data lakes were created to solve these problems.

Data lakes

A data lake can be defined as a centralized repository that allows you to store all structured and unstructured data at any scale. With today’s hyper scalers providing cheap and durable storage, it is now possible for organizations to store all of their data in the cloud without significant cost implications. Data lakes are broken down into layers or zones.

In the first layer of the data lake, data is generally stored as-is. This reduces the entry barrier and enables organizations to move all of their data to the “lake” without significantly increasing development or maintenance costs. Because the first layer of the data lake is an as-is copy of the data, organizations can use an automated configuration-based pipeline to create newer sources.

Organizations usually pick a replication tool such as AWS Data Migration Service (AWS DMS) to bring the data into the data lake. While AWS DMS involves taking care of the replication infrastructure, it is mostly a hands-off mechanism for hydrating the lake. Organizations may also use a push mechanism to FTP to transfer the files to an AWS Simple Storage Service (S3)-based data lake using AWS Transfer Family.

Data from the first layer is compressed and partitioned, and audited columns are added during data preparation so that they can be used by downstream systems more effectively. Having all the data in the data lake enables data analysts to do the initial discovery to find out the value of combining data from various sources. If the value is discovered, then necessary transformations are applied in an ETL pipeline so that the target is hydrated with newer data periodically or through a streaming arrangement. These automated transformations are then loaded into the final layer of a data lake and used for user consumption.

Data lakehouse

Challenged by the newer demands to derive value from the vast and ever-increasing unstructured data, it became important to come up with a new arrangement that does not try to force unstructured data into the strict models of a data warehouse. The data lakehouse blurs the lines between data lakes and data warehouses by enabling the atomicity, consistency, isolation, and durability (ACID) properties on the data in the data lake and enabling multiple processes to concurrently read and write data.

With this, transformed data in open formats such as Apache Parquet can be consumed for feature engineering and machine learning (ML) workloads and can also be used for analytics.

Data mesh

While cheap, durable storage helped in storing vast volumes of data, this data had to be secured properly. Since data from a vast variety of sources is stored in the lake, it becomes difficult to define the ownership and management of this data. This requirement resulted in a paradigm of serving data as a product and setting the ownership of the product. This thought process led to the creation of the data mesh.

Data meshes ensure that data lakes don’t become another monolith that the organization’s IT teams now have to manage. This decentralization leads to the democratization of data, which fuels innovation without hindering access to the data. Although data is decentralized and offered as a service, the permission model that’s applied to create a data lake ensures interoperability to reduce the barriers to accessing data products for users that have the right permissions.

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Description

Organizations these days have gravitated toward services such as AWS Glue that undertake undifferentiated heavy lifting and provide serverless Spark, enabling you to create and manage data lakes in a serverless fashion. This guide shows you how AWS Glue can be used to solve real-world problems along with helping you learn about data processing, data integration, and building data lakes. Beginning with AWS Glue basics, this book teaches you how to perform various aspects of data analysis such as ad hoc queries, data visualization, and real-time analysis using this service. It also provides a walk-through of CI/CD for AWS Glue and how to shift left on quality using automated regression tests. You’ll find out how data security aspects such as access control, encryption, auditing, and networking are implemented, as well as getting to grips with useful techniques such as picking the right file format, compression, partitioning, and bucketing. As you advance, you’ll discover AWS Glue features such as crawlers, Lake Formation, governed tables, lineage, DataBrew, Glue Studio, and custom connectors. The concluding chapters help you to understand various performance tuning, troubleshooting, and monitoring options. By the end of this AWS book, you’ll be able to create, manage, troubleshoot, and deploy ETL pipelines using AWS Glue.

Who is this book for?

ETL developers, data engineers, and data analysts

What you will learn

  • Apply various AWS Glue features to manage and create data lakes
  • Use Glue DataBrew and Glue Studio for data preparation
  • Optimize data layout in cloud storage to accelerate analytics workloads
  • Manage metadata including database, table, and schema definitions
  • Secure your data during access control, encryption, auditing, and networking
  • Monitor AWS Glue jobs to detect delays and loss of data
  • Integrate Spark ML and SageMaker with AWS Glue to create machine learning models
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Table of Contents

19 Chapters
Section 1 – Introduction, Concepts, and the Basics of AWS Glue Chevron down icon Chevron up icon
Chapter 1: Data Management – Introduction and Concepts Chevron down icon Chevron up icon
Chapter 2: Introduction to Important AWS Glue Features Chevron down icon Chevron up icon
Chapter 3: Data Ingestion Chevron down icon Chevron up icon
Section 2 – Data Preparation, Management, and Security Chevron down icon Chevron up icon
Chapter 4: Data Preparation Chevron down icon Chevron up icon
Chapter 5: Data Layouts Chevron down icon Chevron up icon
Chapter 6: Data Management Chevron down icon Chevron up icon
Chapter 7: Metadata Management Chevron down icon Chevron up icon
Chapter 8: Data Security Chevron down icon Chevron up icon
Chapter 9: Data Sharing Chevron down icon Chevron up icon
Chapter 10: Data Pipeline Management Chevron down icon Chevron up icon
Section 3 – Tuning, Monitoring, Data Lake Common Scenarios, and Interesting Edge Cases Chevron down icon Chevron up icon
Chapter 11: Monitoring Chevron down icon Chevron up icon
Chapter 12: Tuning, Debugging, and Troubleshooting Chevron down icon Chevron up icon
Chapter 13: Data Analysis Chevron down icon Chevron up icon
Chapter 14: Machine Learning Integration Chevron down icon Chevron up icon
Chapter 15: Architecting Data Lakes for Real-World Scenarios and Edge Cases Chevron down icon Chevron up icon
Other Books You May Enjoy Chevron down icon Chevron up icon

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carey chin May 30, 2023
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I am echoing hopefully ; newbie;The book is very useful for passing "AWS Certified Data Analytics - Specialty Certification".
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Amber Runnels Aug 30, 2022
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Serverless ETL and Analytics with AWS Glue is the most thorough and helpful guide for working the Glue service. It explains the foundations of data lakes, data formats, and ETL as well Glue best practice. The book is filled with hard to find code samples for performing many operations with Glue to accelerate your adoption. It also features information on Glue's integration with other technology stacks including the much sought after Hudi and Delta Lake. I would recommend this to anyone working with AWS Glue.
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pallavi Nov 08, 2022
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As a new user on learning AWS glue, this is good book to start with. It has covered detailed topics around glue, understanding basics, workflow orchestration, performance aspects, data prep, data security. Also real word examples covering edge cases.
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Monjumi Aug 30, 2022
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With the ever growing need to adopt serverless processing tools and frameworks for ETL workloads and with the immense capabilities that AWS Glue offers in this space, a comprehensive book on Glue was the need of the hour.I enjoyed reading all the sections of this book and I am quite impressed with the level of details captured in each section. To build an effective and scalable ETL strategy on the cloud which would cater to the current and future business needs, the analysts, data engineers and developers should pay attention to these details. The section that drew my attention the most was "Section-5 Data Layout" which highlights some of the key techniques that are often missed because of more emphasis on short-term technical and business goals. These techniques are in fact important considerations to make, to get the best insights out of the data in an efficient manner.One thing that could be a good addition is to include a segment summarizing some of the design patterns and anti-patterns while using AWS Glue. This could be a list of simple DOs' and DONT's which will allow readers to bookmark it for quick access without having to navigate to individual sections. Overall, it is a must read for every data enthusiast. Kudos to the authors!
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Lezhi Qu Sep 07, 2022
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This book is a thorough and in-depth guide on building a data platform for scalable analysis using AWS Glue. It not only covers the rich features of AWS Glue, such as Marketplace Connections, Notebooks, GlueETL, Crawlers, etc. But more importantly, it provides practical guidance on architecting a scalable data platform with Glue. It guides you from core technical concepts to reference architectures to implementation best practices and code snippets. Whether a beginner on data analysis or a tenured solutions architect, you can get lots of value reading this book.
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Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela