jiafu1115 commented on PR #22394:
URL: https://github.com/apache/kafka/pull/22394#issuecomment-4828079571

   <img width="1495" height="797" alt="image" 
src="https://github.com/user-attachments/assets/8ca9ccaf-cb67-4649-a8b3-f696b4f027b1";
 />
   
   Thanks for the discussion.
   refer to code and test metric in the KIP for this case. it won't change the 
existed behavior when user don't change any configure due to the default lag ms 
is 0.   the change for the default size is for user only need to change one 
configure instead of two configures for most of the cases (only set time as 
retention. also it is default configure for kafka.)
   
    if (copyLagMs == 0 || copyLagBytes == 0) {
       return true;
    }
    
   cc @kamalcph  @showuon  
    


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