Incorrect UserName at Solaris because it has no "whoami" command by default
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Key: HDFS-506
URL: https://issues.apache.org/jira/browse/HDFS-506
Project: Hadoop HDFS
Issue Type: Bug
Components: build
Affects Versions: 0.20.1
Environment: OS: SunOS 5.10
Reporter: Urko Benito
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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