[GitHub] [hadoop-ozone] elek commented on pull request #1363: HDDS-3805. [OFS] Remove usage of OzoneClientAdapter interface

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elek commented on pull request #1363:
URL: https://github.com/apache/hadoop-ozone/pull/1363#issuecomment-684914342


   Thanks for the separation @smengcl, I think it's easier to discuss. 
   
   I am not sure it's the same patch what I already commented or not. I had a comment in the previous PR, where the discussion is stopped:
   
   >> I'm in favor of A. I'll attempt to remove the usage of OzoneClientAdapter in OFS altogether then.
   
   > I am fine with that approach but let me add some comments to the latest patch.
   
   >  The naming of BasicRootedOzoneFileSystem and BasicRootedOzoneFileSystemImpl is misleading. Usually the Impl postfix is used when the class implemented a well known interface. There is no such interface here. (It's more like the delegation design pattern not an implementation)
   
   >  As a test: Can you please explain what are the differences between the two classes and the responsibilities?
   
   >  If not, we don't need two classes. Just remove the Impl and remove the dedicated methods and directly call the proxy from the original methods of BasicRootedOzoneFileSystem.
   
   >  Wouldn't it be more simple?
   
   This patch seems to use `BasicRootedOzoneClientAdapterImpl` which is not an `Impl` (not an interface). Do you need a client adapter here (in the old code we need  an interface and an implementation for classpath separation but here this separation is removed.)? If yes, do you need `Impl` in the name (it doesn't implement anything)?


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