Steve Loughran created HADOOP-13712:
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Summary: S3A open to avoid needless HEAD on the successful
execution path
Key: HADOOP-13712
URL: https://issues.apache.org/jira/browse/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
getFileStatus()
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