How to identify auto-created groups
The Groups page in the ApsaraMQ for Kafka console may show consumer groups that you did not manually create. The Kafka cluster auto-creates these groups when certain features or client behaviors register a new group.id.
Check the Auto Creation column on the Groups page:
No -- You manually created this group through the console.
Yes -- The Kafka cluster auto-created this group. See the following section for specific causes.
Why consumer groups are auto-created
Consumer groups are auto-created in the following scenarios:
Flexible group creation is enabled
If you enabled the flexible group creation feature, groups are automatically created in the ApsaraMQ for Kafka cluster and displayed on the Groups page.
Offset commits in Assign mode
Even without flexible group creation, consumer groups can appear if your application uses the Assign mode and commits offsets. The corresponding groups are created in the Kafka cluster and displayed on the Groups page.
Note: If your application uses Assign mode but does not commit offsets, no extra consumer groups are created.