Book Image

Building Big Data Pipelines with Apache Beam

By : Jan Lukavský
Book Image

Building Big Data Pipelines with Apache Beam

By: Jan Lukavský

Overview of this book

Apache Beam is an open source unified programming model for implementing and executing data processing pipelines, including Extract, Transform, and Load (ETL), batch, and stream processing. This book will help you to confidently build data processing pipelines with Apache Beam. You’ll start with an overview of Apache Beam and understand how to use it to implement basic pipelines. You’ll also learn how to test and run the pipelines efficiently. As you progress, you’ll explore how to structure your code for reusability and also use various Domain Specific Languages (DSLs). Later chapters will show you how to use schemas and query your data using (streaming) SQL. Finally, you’ll understand advanced Apache Beam concepts, such as implementing your own I/O connectors. By the end of this book, you’ll have gained a deep understanding of the Apache Beam model and be able to apply it to solve problems.

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Table of Contents (13 chapters)
Preface
Preface
Who this book is for
What this book covers
To get the most out of this book
Download the example code files
Download the color images
Conventions used
Get in touch
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1
Section 1 Apache Beam: Essentials
Section 1 Apache Beam: Essentials
Free Chapter
2
Chapter 1: Introduction to Data Processing with Apache Beam
Chapter 1: Introduction to Data Processing with Apache Beam
Technical requirements
Why Apache Beam?
Writing your first pipeline
Running our pipeline against streaming data
Exploring the key properties of unbounded data
Measuring event time progress inside data streams
Assigning data to windows
Unifying batch and streaming data processing
Summary
3
Chapter 2: Implementing, Testing, and Deploying Basic Pipelines
Chapter 2: Implementing, Testing, and Deploying Basic Pipelines
Technical requirements
Setting up the environment for this book
Task 1 – Calculating the K most frequent words in a stream of lines of text
Task 2 – Calculating the maximal length of a word in a stream
Specifying the PCollection Coder object and the TypeDescriptor object
Understanding default triggers, on time, and closing behavior
Introducing the primitive PTransform object – Combine
Task 3 – Calculating the average length of words in a stream
Task 4 – Calculating the average length of words in a stream with fixed lookback
Ensuring pipeline upgradability
Task 5 – Calculating performance statistics for a sport activity tracking application
Introducing the primitive PTransform object – GroupByKey
Introducing the primitive PTransform object – Partition
Summary
4
Chapter 3: Implementing Pipelines Using Stateful Processing
Chapter 3: Implementing Pipelines Using Stateful Processing
Technical requirements
Task 6 – Using an external service for data augmentation
Introducing the primitive PTransform object – stateless ParDo
Task 7 – Batching queries to an external RPC service
Task 8 – Batching queries to an external RPC service with defined batch sizes
Introducing the primitive PTransform object – stateful ParDo
Using side outputs
Defining droppable data in Beam
Task 9 – Separating droppable data from the rest of the data processing
Task 10 – Separating droppable data from the rest of the data processing, part 2
Using side inputs
Summary
5
Section 2 Apache Beam: Toward Improving Usability
Section 2 Apache Beam: Toward Improving Usability
6
Chapter 4: Structuring Code for Reusability
Chapter 4: Structuring Code for Reusability
Technical requirements
Explaining PTransform expansion
Task 11 – Enhancing SportTracker by runner motivation using side inputs
Introducing composite transform – CoGroupByKey
Task 12 – enhancing SportTracker by runner motivation using CoGroupByKey
Introducing the Join library DSL
Stream-to-stream joins explained
Task 13 – Writing a reusable PTransform – StreamingInnerJoin
Table-stream duality
Summary
7
Chapter 5: Using SQL for Pipeline Implementation
Chapter 5: Using SQL for Pipeline Implementation
Technical requirements
Understanding schemas
Implementing our first streaming pipeline using SQL
Task 14 – Implementing SQLMaxWordLength
Task 15 – Implementing SchemaSportTracker
Task 16 – Implementing SQLSportTrackerMotivation
Further development of Apache Beam SQL
Summary
8
Chapter 6: Using Your Preferred Language with Portability
Chapter 6: Using Your Preferred Language with Portability
Technical requirements
Introducing the portability layer
Implementing our first pipelines in the Python SDK
Task 17 – Implementing MaxWordLength in the Python SDK
Python SDK type hints and coders
Task 18 – Implementing SportTracker in the Python SDK
Task 19 – Implementing RPCParDo in the Python SDK
Task 20 – Implementing SportTrackerMotivation in the Python SDK
Using the DataFrame API
Interactive programming using InteractiveRunner
Introducing and using cross-language pipelines
Summary
9
Section 3 Apache Beam: Advanced Concepts
Section 3 Apache Beam: Advanced Concepts
10
Chapter 7: Extending Apache Beam's I/O Connectors
Chapter 7: Extending Apache Beam's I/O Connectors
Technical requirements
Defining splittable DoFn as a unification for bounded and unbounded sources
Task 21 – Implementing our own splittable DoFn – a streaming file source
Task 22 – A non-I/O application of splittable DoFn – PiSampler
The legacy Source API and the Read transform
Writing a custom data sink
Summary
11
Chapter 8: Understanding How Runners Execute Pipelines
Chapter 8: Understanding How Runners Execute Pipelines
Describing the anatomy of an Apache Beam runner
Explaining the differences between classic and portable runners
Understanding how a runner handles state
Exploring the Apache Beam capability matrix
Understanding windowing semantics in depth
Debugging pipelines and using Apache Beam metrics for observability
Summary
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12
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Task 1 – Calculating the K most frequent words in a stream of lines of text

In the previous chapter, we wrote a very basic pipeline that computed a simple (but surprisingly frequently used) functionality. The pipeline computed the number of occurrences of a word in a text document. We then transformed this to a data stream of lines, which was generated by a TestStream utility.

In the first task of this chapter, we want to extend this simple pipeline to be able to calculate and output only the K most frequent words in a stream of lines. So, let's first define the problem.

Defining the problem

Given an input data stream of lines of text, calculate the K most frequent words within a fixed time window of T seconds.

There are many practical applications for solving this problem. For example, if we had a store, we might want to compute daily statistics to find the products with the maximum profit. However, we have chosen the example of counting words in a text stream...

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