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https://issues.apache.org/jira/browse/HDFS-506?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12756807#action_12756807
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Tsz Wo (Nicholas), SZE commented on HDFS-506:
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> So we now have (essentially) two patches that may make the situation better. 
> Would someone explain to me why either HADOOP-4603 or this one isn't getting 
> committed? 

The patch in HADOOP-4603 only add an absolute path to whoami.  How does it make 
the situation is better?

On the other hand, if someone put their whoami in a different path, say 
/usr/bin/whoami.  The patch will breaks their systems.

> Incorrect UserName at Solaris because it has no "whoami" command by default
> ---------------------------------------------------------------------------
>
>                 Key: HDFS-506
>                 URL: https://issues.apache.org/jira/browse/HDFS-506
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: documentation
>    Affects Versions: 0.20.1
>         Environment: OS: SunOS 5.10
>            Reporter: Urko Benito
>         Attachments: PermissionChecker.java.diff, Shell.java.diff, 
> test-hadoop-security.tar.gz, UnixUserGroupInformation.java.diff
>
>   Original Estimate: 24h
>  Remaining Estimate: 24h
>
> Solaris enviroment has no __whoami__ command, so the __getUnixUserName()__ at 
> UnixUserGroupInformation class fails because it's calling to 
> Shell.USER_NAME_COMMAND which is defines as "whoami".
> So it launched an Exception and set the default "DrWho" username ignoring all 
> the FileSystem permissions.

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