MatrixHB commented on PR #4121:
URL: https://github.com/apache/rocketmq/pull/4121#issuecomment-1090075723

   > Adding the perm check for ordinary topic, the client will get exceptions 
and cannot failover during the matadata discovery time, which is up to 30 
seconds.
   > 
   > For ordinary topics, the original design expects the client to discover 
the new topic route and send only to the writable brokers, which introduces no 
exceptions and makes the wipe-perm process more smoothly.
   
   Thanks, this change is not so elegant actually. Maybe updating the client 
version is enough to solve this problem. Next time we meet this trouble we can 
discuss this again. 
   


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