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From "Uma Maheswara Rao G (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2712) setTimes should support only for files and move the atime field down to iNodeFile.
Date Thu, 05 Jan 2012 16:29:39 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2712?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13180507#comment-13180507
] 

Uma Maheswara Rao G commented on HDFS-2712:
-------------------------------------------

I agree you, with respective to POSIX
But current implementations of DFS supports atime, mtime in iNodes. Looks long back there
was a discussion about this behaviors considering performance and other factors HADOOP-1869.
decided to not supporting the setTimes on directories.
                
> setTimes should support only for files and move the atime field down to iNodeFile.
> ----------------------------------------------------------------------------------
>
>                 Key: HDFS-2712
>                 URL: https://issues.apache.org/jira/browse/HDFS-2712
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: name-node
>    Affects Versions: 0.23.0, 0.24.0
>            Reporter: Uma Maheswara Rao G
>            Assignee: Uma Maheswara Rao G
>         Attachments: HDFS-2712.patch
>
>
> After the dicussion in HDFS-2436, unsupported behaviour for setTimes was intentional
(HADOOP-1869).
> But current INode structure hierarchy seems, it supports atime for directories also.
But as per HADOOP-1869, we are supporting only for files. To avoid the confusions, we can
move the atime fields to INodeFile as we planned to support setTimes only for files. And also
restrict the support for setTimes on directories ( which is implemented with HDFS-2436 ).

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