Expose JMX with something like JMXProxyServlet 
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                 Key: HADOOP-7144
                 URL: https://issues.apache.org/jira/browse/HADOOP-7144
             Project: Hadoop Common
          Issue Type: New Feature
            Reporter: Luke Lu
             Fix For: 0.23.0


Much of the Hadoop metrics and status info is available via JMX, especially 
since 0.20.100, and 0.22+ (HDFS-1318, HADOOP-6728 etc.) For operations staff 
not familiar JMX setup, especially JMX with SSL and firewall tunnelling, the 
usage can be daunting. Using a JMXProxyServlet (a la Tomcat) to translate JMX 
attributes into JSON output would make a lot of non-Java admins happy.

We could probably use Tomcat's JMXProxyServlet code directly, if it's already 
output some standard format (JSON or XML etc.) The code is simple enough to 
port over and can probably integrate with the common HttpServer as one of the 
default servelet (maybe /jmx) for the pluggable security.

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