How to Reset Kafka Consumer Group Offset

how_to_reset_kafka_consumer_group_offset.md

Kafka 0.11.0.0 (Confluent 3.3.0) added support to manipulate offsets for a consumer group via cli kafka-consumer-groups command.

1. List the topics to which the group is subscribed

kafka-consumer-groups --bootstrap-server <kafkahost:port> --group <group_id> --describe

Note the values under "CURRENT-OFFSET" and "LOG-END-OFFSET". "CURRENT-OFFSET" is the offset where this consumer group is currently at in each of the partitions.

2. Reset the consumer offset for a topic (preview)

kafka-consumer-groups --bootstrap-server <kafkahost:port> --group <group_id> --topic <topic_name> --reset-offsets --to-earliest

This will print the expected result of the reset, but not actually run it.

3. Reset the consumer offset for a topic (execute)

kafka-consumer-groups --bootstrap-server <kafkahost:port> --group <group_id> --topic <topic_name> --reset-offsets --to-earliest --execute

This will execute the reset and reset the consumer group offset for the specified topic back to 0.

4. Repeat 1 to check if the reset is successful

Note

• The consumer group must have no running instance when performing the reset. Otherwise the reset will be rejected.
• There are many other resetting options, run kafka-consumer-groups for details
  • --shift-by <positive_or_negative_integer>
  • --to-current
  • --to-latest
  • --to-offset <offset_integer>
  • --to-datetime <datetime_string>
  • --by-duration <duration_string>
• The command also provides an option to reset offsets for all topics the consumer group subscribes to: --all-topics

I actually do not remember, sorry...

Apparently my latests and my earliests offsets have the same values, and are equal to LOG-END-OFFSET. I can not manage to go back to the beginning of the messages.

@dkurzaj that is because your topic doesn't contain messages, and the offset can only be reset to the first message present in the topic at max