cadonna commented on PR #15188:
URL: https://github.com/apache/kafka/pull/15188#issuecomment-1918874061

   > - This feature is not yet implemented on the broker, so 
t[here](https://github.com/apache/kafka/blob/055ff2b831193f5935f9efc2f7809f853f63de5f/clients/src/main/java/org/apache/kafka/clients/consumer/internals/HeartbeatRequestManager.java#L537)
 are a few areas that may need alignment. Would maybe make sense to wait for 
some progress in the broker and then give this another push.
   > - This PR attempts to ensure that the new regex is included in the 
subscription state and that's definitely needed. But then we're missing the 
other half of the story: we should make sure that the regex is passed-on to the 
broker on the next heartbeat request (see HeartbeatRequestManager here)
   
   I do not understand why we want to wait. We should make progress as much as 
possible even if the broker code is not there yet. In the worst case, we would 
get an error back from the broker until the broker-side is implemented. But 
that would be fine in my opinion. 


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