Is it necessary to create a consumer group if there is only one consumer?

If you have only one consumer, creating a consumer group is not necessary. A consumer group in Kafka is designed for scaling consumption and load balancing among multiple consumers.

When there is only one consumer, it can simply subscribe directly to the topic without a group. However, if scaling or offset management functionality is planned in the future, creating a consumer group will be useful.

Summary:

• One consumer — no group needed.
• Planning to scale or need offset control — use a consumer group.