Github user heary-cao commented on the issue:
https://github.com/apache/spark/pull/19693
@cloud-fan @jerryshao @jiangxb1987 thank you for review it.
`Whether shuffle write time should include the file open/close time is
debatable` I agree with you @jerryshao . Because review spark code, see the
realization of this controversy, But this PR hope to unify.
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