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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1138) Modification times are being overwritten when FSImage loads
Date Tue, 11 May 2010 02:19:30 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1138?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12866022#action_12866022
] 

dhruba borthakur commented on HDFS-1138:
----------------------------------------

The behaviour you describe is clearly a bug. can somebody please review this one?

> Modification times are being overwritten when FSImage loads
> -----------------------------------------------------------
>
>                 Key: HDFS-1138
>                 URL: https://issues.apache.org/jira/browse/HDFS-1138
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Dmytro Molkov
>            Assignee: Dmytro Molkov
>         Attachments: HDFS-1138
>
>
> A very easy way to spot the bug is to do a second restart in TestRestartDFS and check
that the modification time on root is the same as it was before the second restart.
> The problem is modifying time of the parent if the modification time of the child is
greater than parent's in addToParent.
> So if you have /DIR/File then on creation of a file modification time of the DIR will
be set, but on cluster restart, or when secondary is checkpointing and reading the image it
will add DIR to "/" and write the new modification time for "/" which is the modification
time of DIR.
> This is clearly a bug. I will attach a patch with one more parameter being passed from
the loadFSImage that says to not propagate the time.

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