ayushtkn commented on PR #5689:
URL: https://github.com/apache/hadoop/pull/5689#issuecomment-1569931307

   yep, it is like that, lot of discussions and tickets around this, example: 
[HDFS-13505](https://issues.apache.org/jira/browse/HDFS-13505), this is also 
marked as incompatible and was pushed only to trunk. This comment also says the 
same thing 
(https://issues.apache.org/jira/browse/HDFS-13505?focusedCommentId=16854777&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-16854777)
   
   may be the reason is like if someone had a use case like he explicitly 
wanted the conf to be "delete" for whatever reasons and the default value was 
also "delete", he didn't configure it considering the default value, now if you 
change it to "keep", that guy who explicitly wanted the value to be delete, he 
has to change and have to configure it to "delete" to preserve his old 
behaviour.
   
   Not against this change, just telling the generic stuff around config 
defaults, what I have read or know about the compat :-) 


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