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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11350) Document the missing settings relevant to DataNode disk IO statistics
Date Thu, 28 Sep 2017 22:12:01 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11350?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16184986#comment-16184986
] 

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}  2m  9s{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/21413/console |
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This message was automatically generated.



> 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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