steveloughran commented on pull request #2307:
URL: https://github.com/apache/hadoop/pull/2307#issuecomment-695032321


   BTW, #2168 is calling out for reviewers. This defines a standard option for 
setting seek policy, and another for file length (you can skip the HEAD check 
then,see). And it sets distcp and other download operations (including YARN) to 
always do sequential.
   
   For ABFS, that tells the stream that one big GET with as much prefetch as 
you can do is going to be best


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