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Home > Data > Data Processing > Apache Kafka Quick Start Guide
Apache Kafka Quick Start Guide
Apache Kafka Quick Start Guide

Apache Kafka Quick Start Guide: Leverage Apache Kafka 2.0 to simplify real-time data processing for distributed applications

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Apache Kafka Quick Start Guide

Message Validation

Chapter 1, Configuring Kafka, focused on how to set up a Kafka cluster and run a command-line producer and a consumer. Having the event producer, we now have to process those events.

Before going into detail, let's present our case study. We need to model the systems of Monedero, a fictional company whose core business is cryptocurrency exchange. Monedero wants to base its IT infrastructure on an enterprise service bus (ESB) built with Apache Kafka. The Monedero IT department wants to unify the service backbone across the organization. Monedero also has worldwide, web-based, and mobile-app-based clients, so a real-time response is fundamental.

Online customers worldwide browse the Monedero website to exchange their cryptocurrencies. There are a lot of use cases that customers can perform in Monedero, but this example is focused on the part of the exchange...

Enterprise service bus in a nutshell

Event processing consists of taking one or more events from an event stream and applying actions over those events. In general, in an enterprise service bus, there are commodity services; the most common are the following:

  • Data transformation
  • Event handling
  • Protocol conversion
  • Data mapping

Message processing in the majority of cases involves the following:

  • Message structure validation against a message schema
  • Given an event stream, filtering the messages from the stream
  • Message enrichment with additional data
  • Message aggregation (composition) from two or more message to produce a new message

This chapter is about event validation. The chapters that follow are about composition and enrichment.

Event modeling

The first step in event modeling is to express the event in English in the following form:

Subject-verb-direct object

For this example, we are modeling the event customer consults the ETH price:

  • The subject in this sentence is customer, a noun in nominative case. The subject is the entity performing the action.
  • The verb in this sentence is consults; it describes the action performed by the subject.
  • The direct object in this sentence is ETH price. The object is the entity in which the action is being done.

We can represent our message in several message formats (covered in other sections of this book):

  • JavaScript Object Notation (JSON)
  • Apache Avro
  • Apache Thrift
  • Protocol Buffers

JSON is easily read and written by both humans and machines. For example, we could chose binary as the representation, but it has a rigid format and it was not designed for humans to...

Setting up the project

This time, we are going to build our project with Gradle. The first step is to download and install Gradle from http://www.gradle.org/downloads.

Gradle only requires a Java JDK (version 7 or higher).

macOS users can install Gradle with the brew command, as follows:

$ brew update && brew install gradle

The output is something like the following:

==> Downloading https://services.gradle.org/distributions/gradle-4.10.2-all.zip
==> Downloading from https://downloads.gradle.org/distributions/gradle-4.10.2-al
######################################################################## 100.0%
  /usr/local/Cellar/gradle/4.10.2: 203 files, 83.7MB, built in 59 seconds

Linux users can install Gradle with the apt-get command, as follows:

$ apt-get install gradle

Unix users can install with sdkman, a tool for managing parallel versions of most Unix-based systems...

Reading from Kafka

Now that we have our project skeleton, let's recall the project requirements for the stream processing engine. Remember that our event customer consults ETH price occurs outside Monedero and that these messages may not be well formed, that is, they may have defects. The first step in our pipeline is to validate that the input events have the correct data and the correct structure. Our project will be called ProcessingEngine.

The ProcessingEngine specification shall create a pipeline application that does the following:

  • Reads each message from a Kafka topic called input-messages
  • Validates each message, sending any invalid event to a specific Kafka topic called invalid-messages
  • Writes the correct messages in a Kafka topic called valid-messages

These steps are detailed in Figure 2.1, the first sketch for the pipeline processing engine:

Figure 2.1: The processing...

Writing to Kafka

Our Reader invokes the process() method; this method belonging to the Producer class. As with the consumer interface, the producer interface encapsulates all of the common behavior of the Kafka producers. The two producers in this chapter implement this producer interface.

In a file called Producer.java, located in the src/main/java/monedero directory, copy the content of Listing 2.6:

package monedero;
import java.util.Properties;
import org.apache.kafka.clients.producer.KafkaProducer;
import org.apache.kafka.clients.producer.ProducerRecord;
public interface Producer {
  void process(String message);                                 //1
  static void write(KafkaProducer<String, String> producer,
                    String topic, String message) {             //2
    ProducerRecord<String, String> pr = new ProducerRecord<>(topic, message);
    producer...

Running the processing engine

The ProcessingEngine class coordinates the Reader and Writer classes. It contains the main method to coordinate them. Create a new file called ProcessingEngine.java in the src/main/java/monedero/ directory and copy therein the code in Listing 2.8.

The following is the content of Listing 2.8, ProcessingEngine.java:

package monedero;
public class ProcessingEngine {
  public static void main(String[] args) {
    String servers = args[0];
    String groupId = args[1];
    String sourceTopic = args[2];
    String targetTopic = args[3];
    Reader reader = new Reader(servers, groupId, sourceTopic);
    Writer writer = new Writer(servers, targetTopic);
    reader.run(writer);
  }
}
Listing 2.8: ProcessingEngine.java

ProcessingEngine receives four arguments from the command line:

  • args[0] servers, the host and port of the Kafka broker
  • args[1] groupId, the consumer group...

Coding a validator in Java

The Writer class implements the producer interface. The idea is to modify that Writer and build a validation class with minimum effort. The Validator process is as follows:

  • Read the Kafka messages from the input-messages topic
  • Validate the messages, sending defective messages to the invalid-messages topic
  • Write the well-formed messages to valid-messages topic

At the moment, for this example, the definition of a valid message is a message t0 which the following applies:

  • It is in JSON format
  • It contains the four required fields: event, customer, currency, and timestamp

If these conditions are not met, a new error message in JSON format is generated, sending it to the invalid-messages Kafka topic. The schema of this error message is very simple:

{"error": "Failure description" }

The first step is create a new Validator.java file...

Running the validation

At the moment, the ProcessingEngine class coordinates the Reader and Writer classes. It contains the main method to coordinate them. We have to edit the ProcessingEngine class located in the src/main/java/monedero/ directory and change Writer with Validator, as in Listing 2.10.

The following is the content of Listing 2.10, ProcessingEngine.java:

package monedero;
public class ProcessingEngine {
  public static void main(String[] args) {
    String servers = args[0];
    String groupId = args[1];
    String inputTopic = args[2];
    String validTopic = args[3];
    String invalidTopic = args[4];
    Reader reader = new Reader(servers, groupId, inputTopic);
    Validator validator = new Validator(servers, validTopic, invalidTopic);
    reader.run(validator);
  }
}
Listing 2.10: ProcessingEngine.java

ProcessingEngine receives five arguments from the command line:

  • args...

Summary

In this chapter we learned how to model the messages in JSON format and how to set up a Kafka project with Gradle.

Also, we learned how to write to and read from Kafka with a Java client, how to run the processing engine, how to code a validator in Java, and how to run the message validation.

In Chapter 3, Message Enrichment, the architecture of this chapter will be redesigned to incorporate message enrichment.

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Key benefits

  • Solve practical large data and processing challenges with Kafka
  • Tackle data processing challenges like late events, windowing, and watermarking
  • Understand real-time streaming applications processing using Schema registry, Kafka connect, Kafka streams, and KSQL

Description

Apache Kafka is a great open source platform for handling your real-time data pipeline to ensure high-speed filtering and pattern matching on the ?y. In this book, you will learn how to use Apache Kafka for efficient processing of distributed applications and will get familiar with solving everyday problems in fast data and processing pipelines. This book focuses on programming rather than the configuration management of Kafka clusters or DevOps. It starts off with the installation and setting up the development environment, before quickly moving on to performing fundamental messaging operations such as validation and enrichment. Here you will learn about message composition with pure Kafka API and Kafka Streams. You will look into the transformation of messages in different formats, such asext, binary, XML, JSON, and AVRO. Next, you will learn how to expose the schemas contained in Kafka with the Schema Registry. You will then learn how to work with all relevant connectors with Kafka Connect. While working with Kafka Streams, you will perform various interesting operations on streams, such as windowing, joins, and aggregations. Finally, through KSQL, you will learn how to retrieve, insert, modify, and delete data streams, and how to manipulate watermarks and windows.

Who is this book for?

This book is for developers who want to quickly master the practical concepts behind Apache Kafka. The audience need not have come across Apache Kafka previously; however, a familiarity of Java or any JVM language will be helpful in understanding the code in this book.

What you will learn

  • How to validate data with Kafka
  • Add information to existing data ?ows
  • Generate new information through message composition
  • Perform data validation and versioning with the Schema Registry
  • How to perform message Serialization and Deserialization
  • How to perform message Serialization and Deserialization
  • Process data streams with Kafka Streams
  • Understand the duality between tables and streams with KSQL
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Publication date : Dec 27, 2018
Length: 186 pages
Edition : 1st
Language : English
ISBN-13 : 9781788997829
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Category :
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Languages :
Java
Concepts :
Data Processing
Tools :
Kafka

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Publication date : Dec 27, 2018
Length: 186 pages
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Language : English
ISBN-13 : 9781788997829
Vendor :
Apache
Category :
Data
Languages :
Java
Concepts :
Data Processing
Tools :
Kafka

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Table of Contents

9 Chapters
Configuring Kafka Chevron down icon Chevron up icon
Configuring Kafka
Kafka in a nutshell
Kafka installation
Running Kafka
Running Confluent Platform
Running Kafka brokers
Running Kafka topics
A command-line message producer
A command-line message consumer
Using kafkacat
Summary
Message Validation Chevron down icon Chevron up icon
Message Validation
Enterprise service bus in a nutshell
Event modeling
Setting up the project
Reading from Kafka
Writing to Kafka
Running the processing engine
Coding a validator in Java
Running the validation
Summary
Message Enrichment Chevron down icon Chevron up icon
Message Enrichment
Extracting the geographic location
Enriching the messages
Extracting the currency price
Enriching with currency price
Running the engine
Extracting the weather data
Summary
Serialization Chevron down icon Chevron up icon
Serialization
Kioto, a Kafka IoT company
Project setup
The constants
HealthCheck message
Java PlainProducer
Running the PlainProducer
Java plain consumer
Java PlainProcessor
Running the PlainProcessor
Custom serializer
Java CustomProducer
Running the CustomProducer
Custom deserializer
Java custom consumer
Java custom processor
Running the custom processor
Summary
Schema Registry Chevron down icon Chevron up icon
Schema Registry
Avro in a nutshell
Defining the schema
Starting the Schema Registry
Using the Schema Registry
Java AvroProducer
Running the AvroProducer
Java AvroConsumer
Java AvroProcessor
Running the AvroProcessor
Summary
Kafka Streams Chevron down icon Chevron up icon
Kafka Streams
Kafka Streams in a nutshell
Project setup
Java PlainStreamsProcessor
Running the PlainStreamsProcessor
Scaling out with Kafka Streams
Java CustomStreamsProcessor
Running the CustomStreamsProcessor
Java AvroStreamsProcessor
Running the AvroStreamsProcessor
Late event processing
Basic scenario
Late event generation
Running the EventProducer
Kafka Streams processor
Running the Streams processor
Stream processor analysis
Summary
KSQL Chevron down icon Chevron up icon
KSQL
KSQL in a nutshell
Running KSQL
Using the KSQL CLI
Processing data with KSQL
Writing to a topic
Summary
Kafka Connect Chevron down icon Chevron up icon
Kafka Connect
Kafka Connect in a nutshell
Project setup
Spark Streaming processor
Reading Kafka from Spark
Data conversion
Data processing
Writing to Kafka from Spark
Running the SparkProcessor
Summary
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Customer reviews

Rating distribution
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(2 Ratings)
5 star 50%
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Edgar Apr 02, 2019
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This books helps you to quickly learn the basics of Apache Kafka.
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Hessam Mar 02, 2019
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The examples in this book cannot be used in real world scenarios. Also its chapters about Kafka features are so shallow. Overall, you are not going to get much from reading it.
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About the author

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Estrada
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Raúl Estrada has been a programmer since 1996 and a Java developer since 2001. He loves all topics related to computer science. With more than 15 years of experience in high-availability and enterprise software, he has been designing and implementing architectures since 2003. His specialization is in systems integration, and he mainly participates in projects related to the financial sector. He has been an enterprise architect for BEA Systems and Oracle Inc., but he also enjoys web, mobile, and game programming. Raúl is a supporter of free software and enjoys experimenting with new technologies, frameworks, languages, and methods. Raúl is the author of other Packt Publishing titles, such as Fast Data Processing Systems with SMACK and Apache Kafka Cookbook.
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List of EU27 countries: www.gov.uk/eu-eea:

A custom duty or localized taxes may be applicable on the shipment and would be charged by the recipient country outside of the EU27 which should be paid by the customer and these duties are not included in the shipping charges been charged on the order.

How do I know my custom duty charges? Chevron down icon Chevron up icon

The amount of duty payable varies greatly depending on the imported goods, the country of origin and several other factors like the total invoice amount or dimensions like weight, and other such criteria applicable in your country.

For example:

  • If you live in Mexico, and the declared value of your ordered items is over $ 50, for you to receive a package, you will have to pay additional import tax of 19% which will be $ 9.50 to the courier service.
  • Whereas if you live in Turkey, and the declared value of your ordered items is over € 22, for you to receive a package, you will have to pay additional import tax of 18% which will be € 3.96 to the courier service.
How can I cancel my order? Chevron down icon Chevron up icon

Cancellation Policy for Published Printed Books:

You can cancel any order within 1 hour of placing the order. Simply contact customercare@packt.com with your order details or payment transaction id. If your order has already started the shipment process, we will do our best to stop it. However, if it is already on the way to you then when you receive it, you can contact us at customercare@packt.com using the returns and refund process.

Please understand that Packt Publishing cannot provide refunds or cancel any order except for the cases described in our Return Policy (i.e. Packt Publishing agrees to replace your printed book because it arrives damaged or material defect in book), Packt Publishing will not accept returns.

What is your returns and refunds policy? Chevron down icon Chevron up icon

Return Policy:

We want you to be happy with your purchase from Packtpub.com. We will not hassle you with returning print books to us. If the print book you receive from us is incorrect, damaged, doesn't work or is unacceptably late, please contact Customer Relations Team on customercare@packt.com with the order number and issue details as explained below:

  1. If you ordered (eBook, Video or Print Book) incorrectly or accidentally, please contact Customer Relations Team on customercare@packt.com within one hour of placing the order and we will replace/refund you the item cost.
  2. Sadly, if your eBook or Video file is faulty or a fault occurs during the eBook or Video being made available to you, i.e. during download then you should contact Customer Relations Team within 14 days of purchase on customercare@packt.com who will be able to resolve this issue for you.
  3. You will have a choice of replacement or refund of the problem items.(damaged, defective or incorrect)
  4. Once Customer Care Team confirms that you will be refunded, you should receive the refund within 10 to 12 working days.
  5. If you are only requesting a refund of one book from a multiple order, then we will refund you the appropriate single item.
  6. Where the items were shipped under a free shipping offer, there will be no shipping costs to refund.

On the off chance your printed book arrives damaged, with book material defect, contact our Customer Relation Team on customercare@packt.com within 14 days of receipt of the book with appropriate evidence of damage and we will work with you to secure a replacement copy, if necessary. Please note that each printed book you order from us is individually made by Packt's professional book-printing partner which is on a print-on-demand basis.

What tax is charged? Chevron down icon Chevron up icon

Currently, no tax is charged on the purchase of any print book (subject to change based on the laws and regulations). A localized VAT fee is charged only to our European and UK customers on eBooks, Video and subscriptions that they buy. GST is charged to Indian customers for eBooks and video purchases.

What payment methods can I use? Chevron down icon Chevron up icon

You can pay with the following card types:

  1. Visa Debit
  2. Visa Credit
  3. MasterCard
  4. PayPal
What is the delivery time and cost of print books? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

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