German locale makes NameNode web interface crash
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                 Key: HADOOP-2456
                 URL: https://issues.apache.org/jira/browse/HADOOP-2456
             Project: Hadoop
          Issue Type: Bug
          Components: dfs
    Affects Versions: 0.15.2
         Environment: Ubuntu Linux 7.10
            Reporter: Matthias Friedrich
            Priority: Minor


When starting the NameNode with a German locale (or some other that uses "," as 
the decimal separator), the web interface (dfshealth.jsp) crashes with a 
NumberFormatException.

To reproduce:

$ LC_ALL=de_DE bin/start-dfs.sh

Then copy some data to the store so that the percentage of used space is above 
0%. Load the web interface in your browser and you'll get a HTTP 500 error 
message.

The problem is that FsShell gives you a localized number (eg. "0,7") which 
can't be parsed by Double.parseDouble().

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