Steve Loughran commented on HADOOP-13625:

This would be a good little part of the FS spec, something completely ignored 
by the docs as it is.

Presumably rename(self, self) doesn' t update the modtime of the parent?

> Document FileSystem actions that trigger update of modification time.
> ---------------------------------------------------------------------
>                 Key: HADOOP-13625
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13625
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: fs
>            Reporter: Chris Nauroth
> Hadoop users and developers of Hadoop-compatible file systems have sometimes 
> asked questions about which file system actions trigger an update of the 
> path's modification time.  This issue proposes to document which actions do 
> and do not update modification time, so that the information is easy to find 
> without reading HDFS code or manually testing individual cases.

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