steveloughran commented on pull request #2637:
URL: https://github.com/apache/hadoop/pull/2637#issuecomment-766810458


   I was thinking about this a bit more and worrying about "maybe I should 
leave the switch in but true everywhere and only document in minimal terms"
   
   Why so? Because it is doing something unusual: renaming paths. If anyone 
ever tried to do a distcp from, say, hdfs and there were __magic paths in 
there, they'd trigger the behaviour. With a switch to turn it off for those 
operations,  at least if someone complains that we are doing bad things. 
   
   Note: given the hdfs rule that _ is the temp prefix I'm not over-worried, 
but I just think it may be good to have an emergency way to unwind


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