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https://issues.apache.org/jira/browse/HDFS-4169?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xiaoyu Yao resolved HDFS-4169.
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Resolution: Duplicate
Fix Version/s: 3.0.0-alpha2
Target Version/s: (was: )
> Add per-disk latency metrics to DataNode
> ----------------------------------------
>
> Key: HDFS-4169
> URL: https://issues.apache.org/jira/browse/HDFS-4169
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: datanode
> Affects Versions: 3.0.0-alpha1
> Reporter: Todd Lipcon
> Assignee: Xiaoyu Yao
> Fix For: 3.0.0-alpha2
>
>
> Currently, if one of the drives on the DataNode is slow, it's hard to
> determine what the issue is. This can happen due to a failing disk, bad
> controller, etc. It would be preferable to expose per-drive metrics/jmx with
> latency statistics about how long reads/writes are taking.
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