spark git commit: [SPARK-21475][CORE][2ND ATTEMPT] Change to use NIO's Files API for external shuffle service

Repository: spark Updated Branches: refs/heads/master 6f68316e9 -> 93f92c0ed [SPARK-21475][CORE][2ND ATTEMPT] Change to use NIO's Files API for external shuffle service ## What changes were proposed in this pull request? This PR is the second attempt of #18684 , NIO's Files API doesn't

spark git commit: [SPARK-21475][CORE][2ND ATTEMPT] Change to use NIO's Files API for external shuffle service

Repository: spark Updated Branches: refs/heads/branch-2.3 bcfeef5a9 -> cd92913f3 [SPARK-21475][CORE][2ND ATTEMPT] Change to use NIO's Files API for external shuffle service ## What changes were proposed in this pull request? This PR is the second attempt of #18684 , NIO's Files API doesn't