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https://issues.apache.org/jira/browse/HDFS-11194?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15747513#comment-15747513
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Kai Zheng commented on HDFS-11194:
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For the trade-off, would it be good to put such new metrics into off-heap? We
have lots of discussions like this but it's hard for existing inode things so
blocked. Maybe it's good for new memory consuming data structures in NameNode.
> Maintain aggregated peer performance metrics on NameNode
> --------------------------------------------------------
>
> Key: HDFS-11194
> URL: https://issues.apache.org/jira/browse/HDFS-11194
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Affects Versions: 2.8.0
> Reporter: Xiaobing Zhou
> Assignee: Xiaobing Zhou
>
> The metrics collected in HDFS-10917 should be reported to and aggregated on
> NameNode as part of heart beat messages. This will make is easy to expose it
> through JMX to users who are interested in them.
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