We Ditched RabbitMQ for Kafka 4.0 and Cut Our Message Processing Latency by 55%

The provided code snippets and descriptions outline a comprehensive strategy for migrating from RabbitMQ to Kafka, focusing on minimizing downtime through dual-writes. Here's an analysis of the key components:

1. Kafka Producer Implementation

The Kafka4Producer class is designed to send messages to a Kafka topic (order-events-v2). It uses Spring Boot annotations for dependency injection and configuration properties.

java
 
1@Service
2public class Kafka4Producer {
3    private final Logger logger = LoggerFactory.getLogger(Kafka4Producer.class);
4    
5    // RabbitMQ connection setup (not used in this migration phase)
6    // ...
7    
8    // Kafka producer setup
9    private final KafkaProducer<String, String> kafkaProducer;
10    private static final String KAFKA_TOPIC = "order-events-v2";
11    
12    @Autowired
13    public Kafka4Producer(@Value("${kafka.bootstrap-servers}") String bootstrapServers) {
14        Properties props = new Properties();
15        props.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapServers);
16        props.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class.getName());
17        props.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, StringSerializer.class.getName());
18
19        kafka
20
21[Read the full article at DEV Community](https://dev.to/johalputt/we-ditched-rabbitmq-for-kafka-40-and-cut-our-message-processing-latency-by-55-4ej0)
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