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From "Yiqun Lin (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-11350) Document the missing settings relevant to DataNode disk IO statistics
Date Thu, 19 Jan 2017 11:44:26 GMT

     [ https://issues.apache.org/jira/browse/HDFS-11350?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Yiqun Lin updated HDFS-11350:
-----------------------------
    Status: Patch Available  (was: Open)

Attach a initial patch. Kindly review.

> 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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