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From "Luke Lu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7144) Expose JMX with something like JMXProxyServlet
Date Tue, 14 Jun 2011 01:34:47 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7144?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13048936#comment-13048936
] 

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

bq. Should the access be per mbean property?

The initial customers for this jira are ops querying metrics mbeans, so the per mbean size
was not an issue. I agree that for things like liveNodes from the NameNodeInfo mbean, returning
all the attributes of the mbean is too wasteful for mere access of lighter-weight attributes
in the same mbean.

Let's open a separate jira to add the get=attribute-or-pattern mechanism. 

> 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: 0.20.205.0, 0.23.0
>
>         Attachments: HADOOP-7411-0.20.20X-V1.patch, HADOOP-7411-0.20.20X-V2.patch, HADOOP-7411-trunk-V1.patch,
HADOOP-7411-trunk-V2.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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