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Introduction to Apache Kafka and its role in real-time data streaming

In this section, we will provide an overview of Apache Kafka and its significance in real-time data streaming. Apache Kafka is a distributed streaming platform that is designed to handle high-volume, high-velocity data streams in real-time. It provides a scalable, fault-tolerant, and durable system for building real-time data pipelines and streaming applications.

Apache Kafka’s architecture revolves around a few key concepts:

  1. Topics: Kafka organizes data streams into topics, which are divided into partitions. Each partition is an ordered, immutable sequence of records.
  2. Producers: Data is produced and sent to Kafka by producers. Producers publish records to specific topics, and Kafka ensures the records are durably stored and replicated.
  3. Consumers: Consumers subscribe to one or more topics and read records from partitions. Kafka allows multiple consumers to work in parallel, providing scalability and fault tolerance.
  4. Brokers: Kafka runs as a cluster of servers called brokers. Brokers are responsible for receiving and storing data from producers and serving it to consumers.

Apache Kafka’s key features make it an ideal choice for real-time data streaming:

  1. Scalability: Kafka is designed for horizontal scalability. It can handle high-throughput workloads by distributing data and processing across multiple brokers.
  2. Durability: Kafka provides fault-tolerant storage of data by replicating partitions across multiple brokers. This ensures that data is not lost even in the event of broker failures.
  3. Low latency: Kafka enables real-time data processing with low-latency capabilities, allowing for near-instantaneous data ingestion and processing.
  4. Stream processing: Kafka’s integration with stream processing frameworks like Kafka Streams, Apache Flink, and Apache Samza makes it a powerful platform for real-time data processing and analytics.

Code Sample:

To showcase the basics of Apache Kafka, consider the following code examples:

Kafka Producer Example (Java):

import org.apache.kafka.clients.producer.*;

import java.util.Properties;

public class KafkaProducerExample {

    public static void main(String[] args) {
        // Configure Kafka producer
        Properties props = new Properties();
        props.put("bootstrap.servers", "localhost:9092");
        props.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer");
        props.put("value.serializer", "org.apache.kafka.common.serialization.StringSerializer");

        // Create Kafka producer
        Producer<String, String> producer = new KafkaProducer<>(props);

        // Produce a sample record
        ProducerRecord<String, String> record = new ProducerRecord<>("my_topic", "my_key", "Hello, Kafka!");
        producer.send(record, (metadata, exception) -> {
            if (exception == null) {
                System.out.println("Message sent successfully. Offset: " + metadata.offset());
            } else {
                System.out.println("Failed to send message: " + exception.getMessage());

        // Close the producer

Kafka Consumer Example (Java):

import org.apache.kafka.clients.consumer.*;
import org.apache.kafka.common.TopicPartition;

import java.util.Collections;
import java.util.Properties;

public class KafkaConsumerExample {

    public static void main(String[] args) {
        // Configure Kafka consumer
        Properties props = new Properties();
        props.put("bootstrap.servers", "localhost:9092");
        props.put("key.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
        props.put("value.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
        props.put("group.id", "my_consumer_group");

        // Create Kafka consumer
        Consumer<String, String> consumer = new


        // Subscribe to a topic

        // Consume records
        while (true) {
            ConsumerRecords<String, String> records = consumer.poll(1000);
            for (ConsumerRecord<String, String> record : records) {
                System.out.println("Received message: " + record.value() + ", Offset: " + record.offset());

Reference Links:

  • Apache Kafka documentation: link
  • Introduction to Apache Kafka: link

Helpful Video:

  • “Apache Kafka Explained in 5 Minutes” by Tech Primers: link

Note: The code samples provided here are simplified examples for illustration purposes. In real-world scenarios, additional configurations, error handling, and optimizations may be required based on the specific use case and technology stack used.


In this module, we introduced Apache Kafka and its role in real-time data streaming. Kafka’s architecture, consisting of producers, brokers, topics, and consumers, provides a robust and scalable solution for handling high-volume, high-velocity data streams in real-time. Its key features, such as scalability, durability, low latency, and fault tolerance, make it a powerful platform for building real-time data pipelines and streaming applications.

Through the provided code examples, we demonstrated how to create Kafka producers and consumers using the Kafka Java API. With this knowledge, you are now equipped to start leveraging Apache Kafka’s capabilities in your own real-time data streaming projects.

About Author
Ozzie Feliciano CTO @ Felpfe Inc.

Ozzie Feliciano is a highly experienced technologist with a remarkable twenty-three years of expertise in the technology industry.

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