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From "Arpit Agarwal (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11722) Change Datanode file IO profiling sampling to percentage
Date Mon, 01 May 2017 15:41:04 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11722?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15990976#comment-15990976
] 

Arpit Agarwal commented on HDFS-11722:
--------------------------------------

Also can you please update {{hadoop-common-project/hadoop-common/src/site/markdown/Metrics.md}}
which still refers to sampling fraction:
{code}
Per-volume metrics contain Datanode Volume IO related statistics. Per-volume
metrics are off by default. They can be enabled by setting `dfs.datanode
.fileio.profiling.sampling.fraction` to a fraction between 0.0 and 1.0.
{code}

> Change Datanode file IO profiling sampling to percentage
> --------------------------------------------------------
>
>                 Key: HDFS-11722
>                 URL: https://issues.apache.org/jira/browse/HDFS-11722
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: hdfs
>            Reporter: Hanisha Koneru
>            Assignee: Hanisha Koneru
>         Attachments: HDFS-11722.001.patch
>
>
> Datanode disk IO profiling sampling is controlled by the setting _dfs.datanode.fileio.profiling.sampling.fraction_.
Instead of fraction, we can a percentage value to make it easier to set.



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