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https://issues.apache.org/jira/browse/HADOOP-2398?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12553501
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Sanjay Radia commented on HADOOP-2398:
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The JMX part merely reads the same stats that are given to Simon.
JMX reads the stats only when a client calls the JMX MBeans' get method.
Hence no additional overhead.
> Additional Instrumentation for NameNode, RPC Layer and JMX support
> -------------------------------------------------------------------
>
> Key: HADOOP-2398
> URL: https://issues.apache.org/jira/browse/HADOOP-2398
> Project: Hadoop
> Issue Type: New Feature
> Components: dfs
> Reporter: Sanjay Radia
> Assignee: Sanjay Radia
> Fix For: 0.16.0
>
> Attachments: metricsPatch6.txt, ScreenShotNameNodeStats.png,
> ScreenShotRPCStats.png
>
>
> Additional Instrumentation is needed for name node and its rpc layer.
> Furthermore the instrumentation should be
> visible via JMX, Java's standard monitoring tool.
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