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https://issues.apache.org/jira/browse/HADOOP-1298?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12527221
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Chris Douglas commented on HADOOP-1298:
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A directory is 'navigable' iff its executable bit is set. A good example is a 
bin directory in a user's home. They might not want people to list the contents 
of their home directory, but they want to share binaries they've built in 
/home/foouser/bin. They can set /home/foouser to 0711 and /home/foouser/bin to 
0755 to effect this. In HDFS, this might be a common directory 
"/foo/bar/upload" with different users/groups able to list the contents of a 
subset of known subdirectories, but they would be prevented from listing the 
contents of /foo/bar/upload.

> 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_2007-09-06b.patch, 1298_2007-09-07g.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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