How to ensure that multiple different consumer systems receive the same message from Kafka?

For multiple different consumer systems to receive the same message from Kafka, it is necessary to use different consumer groups. In Kafka, messages are published to topics, and each topic can be read by multiple consumer groups independently.

Each consumer group receives a copy of each message from the topic. Within a group, messages are distributed among its members, but between different groups — each receives all messages.

Example:

• System A — consumer group groupA
• System B — consumer group groupB

Both systems will receive all messages from the topic because they have different consumer group IDs.

Thus, to ensure delivery of a single message to multiple systems, each system must have its own unique consumer group ID.