chickenchickenlove opened a new pull request, #24023:
URL: https://github.com/apache/kafka/pull/24023

   Fixes KAFKA-20909.
   
   Bump the consumer group epoch when a member's rack ID changes to trigger 
target assignment recomputation.
   
   | Previous rack ID | Requested rack ID | Applied rack ID | Epoch bump |
   |---|---|---|---|
   | null | null | null | no |
   | null | "rack-a" | "rack-a" | yes (+1) |
   | "rack-a" | null | "rack-a" | no |
   | "rack-a" | "rack-a" | "rack-a" | no |
   | "rack-a" | "rack-b" | "rack-b" | yes (+1) |


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