steveloughran commented on PR #8453:
URL: https://github.com/apache/hadoop/pull/8453#issuecomment-4303851245

   @pan3793 +1 for retiring jenkins tests GHA can do
   
   @cnauroth this can be backported. It's just the defaults, We'd log as 
incompatible and say you can change back.
   
   It only affects the shared secrets between running services (mr AM and 
workers, for example), and then it is static...the AM doesn't verify it can 
recreate it, just that it got the same back.
   
   only one I am worried about is HDFS and rolling upgrades. Does a change to 
keylength/algorithm for new shared secrets cause problems?


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