How is the message processing confirmation mechanism implemented in Kafka?

In Apache Kafka, message processing acknowledgment is done through the offset commit mechanism.

Process:

1. The consumer receives a message from the topic.
2. After successful processing of the message, the consumer commits the offset of that message.
3. Kafka stores information about the last committed offset for each consumer group.

In Go, using a Kafka client (such as sarama or confluent-kafka-go), acknowledgment can be automatic or manual:

• Automatic commit — the client periodically sends information about the last processed offset.
• Manual commit — the developer explicitly calls the commit method after processing the message, providing more control and reliability.

Example with sarama (manual commit):

consumer, _ := sarama.NewConsumerGroup(brokers, groupID, config)
// In the message handler after processing:
session.MarkMessage(message, "") // marks the message as processed
// After processing is complete, call Commit()