steveloughran commented on pull request #2675:
URL: https://github.com/apache/hadoop/pull/2675#issuecomment-780659540


   Latest PR moves the prepareRequest() callback of the active span into the 
AWS SDK.
   
   HEAD^ does it in the request factory construction -that's still supported, 
but if we can keep the AWS SDK wiring -that will be better
   * guarantee of being invoked on all S3 operations, even those done in the 
client during startup
   * means we get audit/log of calls like doesBucketExistV2 without us 
reimplementing them 
   * means we can simplify the work I've just done regarding  marking 
operations as OnceRaw and walking up/down the callstack
   
   But: this does mean we need to solve the problem of endpoints and regions


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