LiuGuH commented on PR #5888:
URL: https://github.com/apache/hadoop/pull/5888#issuecomment-1651228974

   > Good improvement. Not think carefully but my first feeling, IBR - FBR 
mis-order could trigger some issues, such as miss some block report? One case, 
a. generate full block report, b. received one replica named `r` and send IBR, 
c. send full block report; And NameNode process FBF and IBR as the above order, 
then NameNode will consider that this DataNode does not include replica `r`, 
right?
   > 
   > Thanks.
   
   In the NamenodeRpcServer side,the ibr and fbr will both into 
BlockManager.BlockReportProcessingThread queue .  I think the order of ibr and 
fbr cannot guarantee in the previous hadoop version.
   
   
![image](https://github.com/apache/hadoop/assets/6347715/53b107a4-9bfb-4ef6-8789-6c77ff687071)
   blockreport will be processed with one after one. But the ibrs order is not  
guaranteed.
   


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