Steve Loughran created HADOOP-13712:

             Summary: S3A open to avoid needless HEAD on the successful 
execution path
                 Key: HADOOP-13712
             Project: Hadoop Common
          Issue Type: Sub-task
          Components: fs/s3
    Affects Versions: 2.7.3
            Reporter: Steve Loughran

S3A's open() operation does a {{getFileStatus()}} check to see if a file is not 
a directory before opening with a GET. That initial check will take up at least 
one HEAD request if the file is present, more if it isn't.

As the GET itself performs the existence check, it is needless. A successful 
GET of a path which doesn't end in "/" means a file was there. The only reason 
a getFileStatus call is needed is to choose which error message to display if 
the path isn't there: is it an FNFE or is it path-is-directory.

Proposed: reorder the code to do the GET; only if that fails fallback to 

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