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https://issues.apache.org/jira/browse/HADOOP-13625?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15504353#comment-15504353
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Steve Loughran commented on HADOOP-13625:
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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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