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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