Is it possible to ensure sequential message output from Kafka so that they are in the same order as they were written to the Topic?

Kafka guarantees message order only within a single partition of a topic. If you want to ensure sequential output of messages in the same order they were written, you need to:

• Use one partition for all messages to preserve order.
• Consume messages from this partition sequentially with a single consumer.

If the topic has multiple partitions, message order between them is not guaranteed, as each partition is processed independently.

Example of producer configuration for sending to a single partition:

ProducerRecord<String, String> record = new ProducerRecord<>("topic", 0, key, value);
producer.send(record);

Here, partition 0 is explicitly specified so that all messages go to one partition and the order is maintained.