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https://issues.apache.org/jira/browse/HADOOP-1298?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12515449
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Christophe Taton commented on HADOOP-1298:
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About EMPTY_BLOCKS_ARRAY and EMPTY_CHILDREN_MAP, it is effectively a 
programming style. However the change eases reasoning about INode, children and 
blocks as there is no need to check null values anymore (then it is also a very 
small optimization...). But to my mind, this makes the code much easier to 
write, read and understand. I remove it if you don't like it?


> 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
>             Fix For: 0.15.0
>
>         Attachments: fsdirectory-cleanup-20070725-1351.patch, 
> hadoop-dev-20070720-1633.patch.gz, hadoop-dev-20070724-0020.patch.gz, 
> hadoop-dev-20070724-2349.patch.gz, 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.patch17, 
> hadoop-user-munncha.patch4, hadoop-user-munncha.patch5, 
> hadoop-user-munncha.patch6, hadoop-user-munncha.patch7, 
> hadoop-user-munncha.patch8, hadoop-user-munncha.patch9, 
> hdfs-access-control.patch.gz
>
>
> 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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