005. Kafka Theory. Consumers & Consumer Groups - MarkHuntDev/my-kafka-exercises GitHub Wiki

Consumers

• Consumers read data from a topic (identified by name)
• Consumers know which broker to read from
• In case of broker failures, consumers know how to recover
• Data is read in order within each partitions

Consumer Groups

• Consumers read data in consumer groups
• Each consumer within a group reads from exclusive partitions
• If you have more consumers than partitions, some consumers will be inactive

Consumer Groups. What if too many consumers?

• If you have more consumers than partitions, some consumers will be inactive