The Kafka Producer API

Introduction to Kafka producers

In Apache Kafka, producers are responsible for publishing messages (events) to Kafka topics. These messages can represent anything—from user clicks and system logs to sensor readings or financial transactions.

In Apache Kafka, producers are responsible for publishing messages (events) to Kafka topics. These messages can represent anything—from user clicks and system logs to sensor readings or financial transactions.

At a high level, sending data to Kafka using the Producer API involves just a few steps:

1. Configure the Kafka producer

2. Create a KafkaProducer instance

3. Send messages to a Kafka topic

While this sounds simple, how you send messages has a big impact on:

• Performance

• Reliability

• Latency

Kafka supports two primary producer patterns:

• Synchronous producers

• Asynchronous producers

Let’s explore both and understand when to use each.

Producer configuration basics

Before sending messages, we configure the producer using a java.util.Properties object.

Common configuration properties include:

• bootstrap.servers – Kafka broker address

• key.serializer – Converts keys to bytes

• value.serializer – Converts values to bytes

• linger.ms – Controls batching delay

These settings determine how efficiently and reliably messages are delivered to Kafka. ...