What to do if one partition cannot have more consumers?

If you have a single partition and cannot increase the number of consumers (for example, in Kafka), then parallel consumption scaling is not possible, as one consumer per partition is a broker limitation.

What can be done:

• Optimize message processing within the consumer to increase throughput (for example, use batching, parallel processing within a single consumer).
• Reconsider the producer logic and partitioning, possibly increase the number of partitions if possible.
• If changing the number of partitions is not possible, consider alternative architectural solutions, such as using multiple topics or other load distribution mechanisms.

Overall, the limitation to a single partition significantly restricts horizontal scaling of consumers.