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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 19:44:58 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7144?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12994959#comment-12994959
] 

Luke Lu commented on HADOOP-7144:
---------------------------------

All metrics are published via JMX via HADOOP-6728. Metrics doesn't support status, event and
a lot meta information that are not time-series, which is a good thing by design. I'm not
proposing deprecating metrics system per se (in fact HADOOP-6728 enhanced it in a major way),
but the /metrics servlet.

> 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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