Github user steveloughran commented on the issue:
https://github.com/apache/spark/pull/14731
The Hadoop FS Spec has now been updated to declare exactly what HDFS does
w.r.t timestamps, and warn that what other filesystems and object stores do are
implementation and installation specific features:
[filesystem.md](https://github.com/apache/hadoop/blob/trunk/hadoop-common-project/hadoop-common/src/site/markdown/filesystem/introduction.md)
That is the associated documentation update with this one; some of the
content there was originally here, but moved over to the hadoop docs for the
HDFS team to take the blame for when it changes.
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