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https://issues.apache.org/jira/browse/HADOOP-1298?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12525593
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Raghu Angadi commented on HADOOP-1298:
--------------------------------------

'Browse Directory' results in an NPE :

Simple cluster with one datanode. Started from scratch. added one file with 
copyFromLocal. went to namenode:50070/ and clicked on the datanode link :

We page shows this :

{noformat}
HTTP ERROR: 500

java.io.IOException: java.lang.NullPointerException
        at org.apache.hadoop.dfs.NameNode.isDir(NameNode.java:437)
        at org.apache.hadoop.dfs.NameNode$12.run(NameNode.java:1070)
        at org.apache.hadoop.dfs.NameNode$12.run(NameNode.java:1068)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.security.auth.Subject.doAsPrivileged(Subject.java:517)
        at org.apache.hadoop.dfs.NameNode.doAsSubject(NameNode.java:917)
        at org.apache.hadoop.dfs.NameNode.isDir(NameNode.java:1068)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:341)
        at org.apache.hadoop.ipc.Server$Handler.run(Server.java:566)

RequestURI=/browseDirectory.jsp
{noformat}

> 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_2007-09-05g.patch, 1298_2007-09-06a.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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