steveloughran commented on PR #7830:
URL: https://github.com/apache/hadoop/pull/7830#issuecomment-3137107212

   Latest commit will read old versions. What it doesn't do is track which 
version it received, so if it ever has to save that DT again it'll return a new 
one.
   
   I don't know if it that is an issue in the use case of
   
   hadoop 3.4.x app launched into cluster with 3.5.x servers; the DT list will 
now be safely parsed by the yarn RM, but if the list is saved again (and we do 
that for passing RM to container Credentials, don't we?) then the new version 
is saved. So if a container is now launched with a 3.4.x hadoop-aws module, it 
wouldn't be able to unmarshall the data.
   
   fix'd be to remember and use when saving, -but I need to be sure it is worth 
the effort first


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