steveloughran commented on pull request #2977:
URL: https://github.com/apache/hadoop/pull/2977#issuecomment-839020783


   could i trouble @aw-was-here qnd @lmccay for a review of this? it's going 
near security issues on a file with significant scope for damage if I get it 
wrong.
   
   key issue: in secure configs the fallback for undefined env cars stops 
working. this fix ensures that the fallback is resolved; all env vars and 
system properties are treated as undefined. the env. fallback then happens 
automatically. 


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