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https://issues.apache.org/jira/browse/HDFS-11350?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17081513#comment-17081513
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Hadoop QA commented on HDFS-11350:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue}  0m  
0s{color} | {color:blue} Docker mode activated. {color} |
| {color:red}-1{color} | {color:red} patch {color} | {color:red}  0m  7s{color} 
| {color:red} HDFS-11350 does not apply to trunk. Rebase required? Wrong 
Branch? See https://wiki.apache.org/hadoop/HowToContribute for help. {color} |
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|| Subsystem || Report/Notes ||
| JIRA Issue | HDFS-11350 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12848284/HDFS-11350.001.patch |
| Console output | 
https://builds.apache.org/job/PreCommit-HDFS-Build/29118/console |
| Powered by | Apache Yetus 0.8.0   http://yetus.apache.org |


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> 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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