slfan1989 commented on PR #6444:
URL: https://github.com/apache/hadoop/pull/6444#issuecomment-1893890264

   > any specific reason to downgrade the maven version?
   
   @steveloughran Thank you for your message!  
   
   Downgrading Maven is not due to any issues encountered during compilation,  
but rather because Maven 3.6.3 is used by other operating systems and it would 
be better for us to ensure version consistency.
   
   While preparing for the 3.4.0 release, I noticed that the dev-support 
includes a variety of operating systems
   such as CentOS 7, CentOS 8, Ubuntu, Debian, Windows, and more. 
   
   These operating systems have different ways of initializing Maven, as shown 
in the following table:
   
   | Operating System | Maven version | Initialization |
   | ------------- | ------------- |------------- |
   | Centos7 | 3.6.3 | Download  |
   | Centos8 | 3.6.3 | Download  |
   | Ubuntu  | 3.6.3 | Yum  |
   | Debian  | 3.6.3 | Yum  |
   | Windows  | 3.8.6 | Download  |
   
   My personal opinion is to keep the Maven initialization method and version 
consistent. However, I would also like to hear the thoughts of other members.
   


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