[jira] [Commented] (HADOOP-7144) Expose JMX with something like JMXProxyServlet

["Robert Joseph Evans (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-7144?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13041866#comment-13041866 ] 

Robert Joseph Evans commented on HADOOP-7144:
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It is there because that is what tomcat is doing inside their JMXProxy Servlet which I modified, and didn't take the time to understand all of the possible exceptions that could be thrown in each of the cases to clean it up.

Part of the reason for ignoring the exceptions is because JMX can execute arbitrary code inside the JMXBeans, which could throw all kinds of exceptions.  Ideally we would like the code to be robust so that if some beans are causing issues that we can still output data for the rest of the beans.  But I will look at what it takes to clean up the exception handling.

> 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
>            Assignee: Robert Joseph Evans
>              Labels: jmx
>             Fix For: 0.23.0
>
>         Attachments: HADOOP-7411-0.20.20X-V1.patch, HADOOP-7411-trunk-V1.patch, HADOOP-7411-trunk-alpha.patch, jmx.json
>
>
> 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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