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From "Konstantin Shvachko (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-1298) adding user info to file
Date Fri, 18 May 2007 16:56:16 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1298?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12496952

Konstantin Shvachko commented on HADOOP-1298:

Sorry, don't have bandwidth to go deep in it. Dhruba is going to review this.
I have a couple of wishes:
# If possible it would be good to make the file status *_extensible_*. We will probably want
to introduce different file attributes in the future.
Creation time is going to be one of the nearest additions, and if we want to add compressed/uncompressed
flag, or the number of records
in the file, or any other attributes in the future we should be able to do that in a generic
way with minimal changes in the name-node code
and ClientProtocol, just by providing a proper interface on the client side. Particularly,
this implies that we should have more generic
*_protocol_* methods, like getStatus() and changeStatus(), rather than introducing getters
and setters for every new attribute.
# All data-structures introduced on the name-node should be very *_space efficient_*. Using
bits was a good decision. Lets take a closer
look on what should/could be optimized even further. Especially the *_defaults_*, in which
case we want almost no overhead compared to
the pre-permissions version.

> 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
>         Attachments: hadoop-user-munncha.patch, hadoop-user-munncha.patch, hadoop-user-munncha.patch,
hadoop-user-munncha.patch10, hadoop-user-munncha.patch11, hadoop-user-munncha.patch12, hadoop-user-munncha.patch13,
hadoop-user-munncha.patch14, hadoop-user-munncha.patch15, hadoop-user-munncha.patch16, hadoop-user-munncha.patch4,
hadoop-user-munncha.patch5, hadoop-user-munncha.patch6, hadoop-user-munncha.patch7, hadoop-user-munncha.patch8,
> 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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