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From "Mingliang Liu (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-13946) Document how HDFS updates timestamps in the FS spec; compare with object stores
Date Tue, 07 Mar 2017 23:46:38 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-13946?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Mingliang Liu updated HADOOP-13946:
    Attachment: Screen Shot 2017-03-07 at 3.44.43 PM.png

Chris' comment makes sense to me. I slightly changed the v4 patch and uploaded the v5 one
for addressing that. Specially, the "*but" was changed to "but" removing the "*". I think
we can live without that. For wasb:// linking problem I used ` to wrap it as code as `wasb://`.
Also fixed typo "artificially".

Preview from my screenshot [#Screen Shot 2017-03-07 at 3.44.43 PM.png].

I'm assuming the v5 patch inherits all the +1s on v4 patch; will commit in 3 days if no objections.

> 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
>         Attachments: HADOOP-13946-001.patch, HADOOP-13946-002.patch, HADOOP-13946-003.patch,
HADOOP-13946-004.patch, HADOOP-13946-005.patch, Screen Shot 2017-03-07 at 3.44.43 PM.png
> 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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