steveloughran commented on issue #1229: HADOOP-16490. Improve S3Guard handling 
of FNFEs in copy
URL: https://github.com/apache/hadoop/pull/1229#issuecomment-520236749
 
 
   Proposed changes to this PR then
   
   * enum to control which probes to make
   * tests to verify that `create()` codepath doesn't do HEAD path when 
overwrite=true (different asserts for s3guard/s3guard auth)
   * not in scope for the initial PR: expanding to mkdir and other stat ops;  
keeping them separate PRs with their own tests makes the changes more 
incremental.

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