jolshan commented on pull request #11170:
URL: https://github.com/apache/kafka/pull/11170#issuecomment-925320746


   I was thinking a bit about this and the downgrade path and I realized that 
we never remove the topic ID from the state. I think this is ok because a 
downgrade will no longer use topic IDs in the fetch request (even if they are 
present) due to the replication path being gated on ibp. 
   
   I think we are ok with this approach but just wanted to mention. 


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