What difficulties have you encountered when implementing and using Kafka in projects?

When implementing Kafka in Node.js projects, I often encountered the following challenges:

• Broker setup and management: Properly configuring the Kafka cluster can be difficult for beginners.
• Error handling and retries: It's important to handle failures during message sending and receiving to prevent data loss.
• Performance management: Load balancing and tuning parameters such as batch size and delays to ensure optimal performance.
• Message serialization/deserialization: Choosing the format (e.g., JSON, Avro) and correctly processing data.
• Integration with Node.js: Using libraries like kafkajs or node-rdkafka requires understanding their APIs and asynchronous programming features.

For example, when using kafkajs, it's crucial to handle error events properly and control the lifecycle of the producer and consumer.