qianye1001 commented on PR #10565:
URL: https://github.com/apache/rocketmq/pull/10565#issuecomment-4852130108

   I don't think we should enable retry topic V2 by default in this PR yet.
   
   Keeping `retrieveMessageFromPopRetryTopicV1=true` only proves that the new 
version can still read existing V1 retry topics. It does not fully validate a 
graceful upgrade path from V1 to V2, especially for rolling upgrades or 
mixed-version / mixed-config clusters where some brokers may still produce or 
consume retry messages using the V1 naming rule while others switch to V2.
   
   Before changing the default, we should have explicit upgrade compatibility 
verification covering the V1 -> V2 transition, or keep `enableRetryTopicV2` 
disabled by default and make the migration opt-in/documented.


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