adoroszlai commented on pull request #2231:
URL: https://github.com/apache/ozone/pull/2231#issuecomment-836857022


   @dineshchitlangia Thanks for taking a look.
   
   > How does it make the upgrade easier?  My understanding is that since this 
is a warning it should cause any failures/error/process termination.
   
   Correct, it's only a warning, does not cause any failure.
   
   We deprecated the `HADOOP_*` variables in favor of `OZONE_*` ones mainly to 
be able to define different values for a co-existing Hadoop + Ozone 
installation.  In an existing Ozone install where one doesn't need that 
flexibility, we can live with `HADOOP_*`, but the warning printed for each CLI 
command may be annoying anyway.  The ability to suppress the warning makes 
upgrade easier because otherwise you would have to rename all the other 
variables just to get rid of the warning.


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