steveloughran commented on issue #606: HADOOP-16190. S3A copyFile operation to 
include source versionID or etag in the copy request
URL: https://github.com/apache/hadoop/pull/606#issuecomment-482727455
 
 
   bq. . There we only apply constraints indicated by the 
fs.s3a.change.detection configuration whereas here you apply constraints 
regardless of that config. You probably already realize this, but just wanted 
to be sure. Still, I'm not bothered enough by the inconsistency to say you 
shouldn't go ahead with it if you like.
   
   I couldn't see way of turning not making this mandatory, and at the same 
time, why anyone wouldn't want a single copy to be of a single file, not a 
mixture of blocks. If I'd known that this problem existed and could be stopped, 
I'd had have this patch in a long time ago. I'll probably backport all the way 
to hadoop 2.8+ for that reason -which is not something I was planning for the 
input stream code. 

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