How to re-read a message from Kafka?

There are several approaches to re-reading messages from Kafka:

1. Reset the consumer offset. If you are using the Kafka Consumer API, you can manually set the offset to the desired position, such as the beginning or a specific value. This allows you to re-read messages from that offset.

Example in Java:

consumer.seek(new TopicPartition("topicName", partition), offset);

2. Use a consumer group with a different groupId. Create a new consumer with a unique groupId — it will read messages from the beginning or from the last saved offset for that group.

3. Use the kafka-consumer-groups.sh command to reset the offset:

kafka-consumer-groups.sh --bootstrap-server localhost:9092 --group my-group --topic my-topic --reset-offsets --to-earliest --execute

4. Use the auto.offset.reset = earliest mode when starting a new consumer.

Important: Re-reading messages may lead to duplicate processing, so idempotency of message processing should be considered.