We use the KafkaTemplate class which wraps a Producer and provides high-level operations to send data to Kafka topics. (Step-by-step) So if you’re a Spring Kafka beginner, you’ll love this guide. Our KafkaProducer bean defined above is merely a wrapper around the KafkaTemplate class. The idempotent producer strengthens Kafka's delivery semantics from at least once to exactly once delivery. Since there is only one leader broker for that partition, both message will be written to different offsets. This can be used for custom partitioning. The KafkaTemplate class is available in org.springframework.kafka.core package and implements the KafkaOperations interface. 3.2. This class provides high-level thread-safe operations, such as sending data to the provided topic, which is exactly what we do in our send method. It's up to the developer what to use. Let’s get started. You can see KafkaTemplate provide many additional ways of sending data to Kafka topics because of various send methods while some calls are the same as Kafka API and are simply forwarded from KafkaTemplate to KafkaProducer. Syntax of the flush method is as follows − public void flush() KafkaProducer class provides partitionFor method, which helps in getting the partition metadata for a given topic. In particular producer retries will no longer introduce duplicates. Both asynchronous and synchronous methods are provided, with the async methods returning a Future. Kafka Tutorial: Writing a Kafka Producer in Java. From Kafka 0.11, the KafkaProducer supports two additional modes: the idempotent producer and the transactional producer. Consumer Setup Yes, KafkaTemplate is designed to be thread-safe. In this tutorial, we are going to create simple Java example that creates a Kafka producer. I’m really excited to announce a major new feature in Apache Kafka v0.10: Kafka’s Streams API.The Streams API, available as a Java library that is part of the official Kafka project, is the easiest way to write mission-critical, real-time applications and microservices with all the benefits of Kafka’s server-side cluster technology. If you look at its source code, you see the following member variable declarations:. Kafka producer clients may write on the same topic and on the same partiton but this is not a problem to kafka servers. You create a new replicated Kafka topic called my-example-topic, then you create a Kafka producer that uses this topic to send records.You will send records with the Kafka producer. KafkaProducer class provides a flush method to ensure all previously sent messages have been actually completed. Reactor is a highly optimized reactive library for building efficient, non-blocking applications on the JVM based on the Reactive Streams Specification.Reactor based applications can sustain very high throughput message rates and operate with a very low memory footprint, making it suitable for building efficient event-driven applications using the microservices architecture. Spring Kafka Consumer Producer Example 10 minute read In this post, you’re going to learn how to create a Spring Kafka Hello World example that uses Spring Boot and Maven. Let’s start by sending messages. The KafkaOperations interface contains the different overloaded versions of the send() method. Same topic and on the same topic and on the same topic and the! Semantics from at least once to exactly once delivery different offsets are provided, with the methods. The KafkaOperations interface contains the different overloaded versions of the send ( ) method: a. 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