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From "Luke Lu (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-7144) Expose JMX with something like JMXProxyServlet
Date Tue, 15 Feb 2011 17:50:05 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7144?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12994898#comment-12994898
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Luke Lu commented on HADOOP-7144:
---------------------------------

jmx is not just metrics, as the name implies, it's a management interface that can handle
metrics, events and other meta info (like software version etc.) and we're still not sure
whether we should expose the write/update interface (for changing configs dynamically etc.)

I'd propose that we deprecate/remove the old /metrics servlet (which needs to be ported to
the new metrics system anyway) once /jmx is in place.

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