tomscut commented on pull request #3547:
URL: https://github.com/apache/hadoop/pull/3547#issuecomment-943459371


   > In the results of jenkins, there are some exceptions, such as: 
TestHDFSFileSystemContract TestLeaseRecovery TestFileTruncate 
TestBlockTokenWithDFSStriped TestViewDistributedFileSystemWithMountLinks After 
analysis, it does not seem to have much connection with the code I submitted.
   > 
   > @tomscut @prasad-acit , would you like to spend some time to help review 
this pr. Thank you very much.
   
   Hi @jianghuazhu , sorry for the late reply. 
   
   IMO, there's nothing wrong with this hint.
   
   Because when you specify the remote namenode with ```-fs```, if you do not 
set ```dfs.namenode.fs-limits.min-block-size=16``` (because default 
```BLOCK_SIZE = 16```), the default value of 
```dfs.namenode.fs-limits.min-block-size``` on remote namenode will be 
1024*1024 -> 1048576, and which will causes the following exception.
   
   
![nn-benchmark](https://user-images.githubusercontent.com/55134131/137347018-10729da7-141d-488e-b0db-635f1cf12065.jpg)
   


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