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https://issues.apache.org/jira/browse/HDFS-11350?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17802521#comment-17802521
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Shilun Fan commented on HDFS-11350:
-----------------------------------
Bulk update: moved all 3.4.0 non-blocker issues, please move back if it is a
blocker. Retarget 3.5.0.
> Document the missing settings relevant to DataNode disk IO statistics
> ---------------------------------------------------------------------
>
> Key: HDFS-11350
> URL: https://issues.apache.org/jira/browse/HDFS-11350
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: documentation
> Affects Versions: 3.0.0-alpha2
> Reporter: Yiqun Lin
> Assignee: Yiqun Lin
> Priority: Minor
> Attachments: HDFS-11350.001.patch
>
>
> HDFS-11299 and HDFS-11339 introduced some new setting relevant to profiling
> hooks to expose latency statistics around DataNode disk IO. These settings
> should be intended for users but they are not documented. Totally three
> relevant settings:
> 1.dfs.datanode.enable.fileio.profiling
> 2.dfs.datanode.enable.fileio.fault.injection
> 3.dfs.datanode.fileio.profiling.sampling.fraction
> Actually, only the setting {{dfs.datanode.enable.fileio.fault.injection}}
> don't need to be documented.
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