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https://issues.apache.org/jira/browse/HADOOP-7144?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12994899#comment-12994899
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Allen Wittenauer commented on HADOOP-7144:
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Did .21 ship with /metrics? If not, there is no need to deprecate it. We can
just remove it.
> 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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