[I] [Bug] Empty consumer groups can be created but cannot be consumed [rocketmq]

[via GitHub]

hexueyuan opened a new issue, #9044:
URL: https://github.com/apache/rocketmq/issues/9044

   ### Before Creating the Bug Report
   
   - [X] I found a bug, not just asking a question, which should be created in 
[GitHub Discussions](https://github.com/apache/rocketmq/discussions).
   
   - [X] I have searched the [GitHub 
Issues](https://github.com/apache/rocketmq/issues) and [GitHub 
Discussions](https://github.com/apache/rocketmq/discussions)  of this 
repository and believe that this is not a duplicate.
   
   - [X] I have confirmed that this bug belongs to the current repository, not 
other repositories of RocketMQ.
   
   
   ### Runtime platform environment
   
   CentOS 8
   
   ### RocketMQ version
   
   4.9.8 and 5.3.1
   
   ### JDK Version
   
   1.8.0
   
   ### Describe the Bug
   
   Create blank consumer group with mqadmin:
   
![461561c3be8b46f7516246645a81c1af](https://github.com/user-attachments/assets/777ace62-22c0-41a2-a049-9dcf0a60ead8)
   
   Broker subGroup config:
   
![22ca37e527b5826f66e8c8b8c42509c1](https://github.com/user-attachments/assets/b0964513-dc81-403c-8786-7024c888585f)
   
   Use benchmark tools to consume it but failed:
   
![a7d06d4309fb392b581f86890e6ba048](https://github.com/user-attachments/assets/695d2d0d-03b6-49a2-85a9-6e4e2c58495a)
   
   
   ### Steps to Reproduce
   
   In any version, use mqadmin to create empty consume group.
   
   ### What Did You Expect to See?
   
   Broker should forbidden to create empty consumer group.
   
   ### What Did You See Instead?
   
   Create empty consumer group success.
   
   ### Additional Context
   
   _No response_


-- 
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.

To unsubscribe, e-mail: commits-unsubscr...@rocketmq.apache.org.apache.org

For queries about this service, please contact Infrastructure at:
us...@infra.apache.org