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https://issues.apache.org/jira/browse/HDFS-9229?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14967575#comment-14967575
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Haohui Mai commented on HDFS-9229:
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The metric needs to live in a different place instead of {{NameNodeMXBean}}.
All other metrics in the interface do not involve I/O and are polled frequently.
This metric requires an unbound I/O time which can break many monitoring
applications.
> Expose size of NameNode directory as a metric
> ---------------------------------------------
>
> Key: HDFS-9229
> URL: https://issues.apache.org/jira/browse/HDFS-9229
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: namenode
> Affects Versions: 2.7.1
> Reporter: Zhe Zhang
> Assignee: Surendra Singh Lilhore
> Priority: Minor
> Attachments: HDFS-9229.001.patch, HDFS-9229.002.patch,
> HDFS-9229.003.patch
>
>
> Useful for admins in reserving / managing NN local file system space. Also
> useful when transferring NN backups.
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