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https://issues.apache.org/jira/browse/HADOOP-13946?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15814660#comment-15814660
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Steve Loughran commented on HADOOP-13946:
-----------------------------------------
thanks
> Document how HDFS updates timestamps in the FS spec; compare with object
> stores
> -------------------------------------------------------------------------------
>
> Key: HADOOP-13946
> URL: https://issues.apache.org/jira/browse/HADOOP-13946
> Project: Hadoop Common
> Issue Type: Improvement
> Components: documentation, fs
> Affects Versions: 2.7.3
> Reporter: Steve Loughran
> Assignee: Steve Loughran
> Priority: Minor
> Fix For: 2.8.0, 3.0.0-alpha2
>
> Attachments: HADOOP-13946-001.patch, HADOOP-13946-002.patch
>
>
> SPARK-17159 shows that the behavior of when HDFS updates timestamps isn't
> well documented. Document these in the FS spec.
> I'm not going to add tests for this, as it is so very dependent on FS
> implementations, as in "POSIX filesystems may behave differently from HDFS".
> If someone knows what happens there, their contribution is welcome.
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