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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-1298) adding user info to file
Date Wed, 05 Sep 2007 07:22:35 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1298?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12525003
] 

dhruba borthakur commented on HADOOP-1298:
------------------------------------------

I like the idea of having permissions for directories and not for files. It has a few advantages:

1. It uses much less memory usage on the namenode.
2. It has precedence: AFS has permissions only on directories (http://www.cs.unc.edu/cgi-bin/howto?howto=afs-security)
3. Most map-reduce applications deal with directories. A directory is a fileset and contains
files that store related data. All files in a directory are typically owned by the same user.
In this situation, it is sufficient to store permissions for the entire directory (rather
than per file).



> adding user info to file
> ------------------------
>
>                 Key: HADOOP-1298
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1298
>             Project: Hadoop
>          Issue Type: New Feature
>          Components: dfs, fs
>            Reporter: Kurtis Heimerl
>            Assignee: Christophe Taton
>             Fix For: 0.15.0
>
>         Attachments: 1298_2007-08-30a.patch, hadoop-user-munncha.patch17
>
>
> I'm working on adding a permissions model to hadoop's DFS. The first step is this change,
which associates user info with files. Following this I'll assoicate permissions info, then
block methods based on that user info, then authorization of the user info. 
> So, right now i've implemented adding user info to files. I'm looking for feedback before
I clean this up and make it offical. 
> I wasn't sure what release, i'm working off trunk. 

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