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Date: Tue, 26 May 2009 13:26:45 -0700 (PDT)
From: "Rodrigo Schmidt (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Commented: (HADOOP-5620) discp can preserve modification
 times of files
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    [ https://issues.apache.org/jira/browse/HADOOP-5620?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12713232#action_12713232 ] 

Rodrigo Schmidt commented on HADOOP-5620:
-----------------------------------------

- Dhruba told me modification times of directories are not persistent, that is, on namenode restart they are set to the latest modification time amongst the files they contain.

- If we get atime inside the if, it will be the copy time (last access after copying the file) instead of the latest access time before copying, which is what we need for migration.

> discp can preserve modification times of files
> ----------------------------------------------
>
>                 Key: HADOOP-5620
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5620
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: tools/distcp
>            Reporter: dhruba borthakur
>            Assignee: Rodrigo Schmidt
>             Fix For: 0.21.0
>
>         Attachments: HADOOP-5620.patch
>
>
> It will be helpful if distcp can preserve the modification time and access time of files. This helps to archive/unarchive hdfs files.

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