bilaharith opened a new pull request #1969:
URL: https://github.com/apache/hadoop/pull/1969


   Each time an FS instance is created a Getacl call is made. If the call fails 
with 400 Bad request, the account is determined to be a non-HNS account.
   
   Recommendation is to create a config and be able to avoid store calls to 
determine account HNS status,
   
   If config is available, use that to determine account HNS status. If config 
is not present in core-site, default behaviour will be calling getAcl.
   
   **Driver test results using accounts in Central India**
   mvn -T 1C -Dparallel-tests=abfs -Dscale -DtestsThreadCount=8 clean verify
   
   **Account with HNS Support**
   [INFO] Tests run: 52, Failures: 0, Errors: 0, Skipped: 0
   [WARNING] Tests run: 424, Failures: 0, Errors: 0, Skipped: 66
   [WARNING] Tests run: 206, Failures: 0, Errors: 0, Skipped: 24
   
   **Account without HNS support**
   [INFO] Tests run: 52, Failures: 0, Errors: 0, Skipped: 0
   [WARNING] Tests run: 424, Failures: 0, Errors: 0, Skipped: 240
   [WARNING] Tests run: 206, Failures: 0, Errors: 0, Skipped: 24


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