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Date: Wed, 4 Jan 2017 11:10:59 +0000 (UTC)
From: "Yiqun Lin (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Updated] (HDFS-11282) Document the missing metrics of
 DataNode Volume IO operations
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archived-at: Wed, 04 Jan 2017 11:11:01 -0000


     [ https://issues.apache.org/jira/browse/HDFS-11282?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Yiqun Lin updated HDFS-11282:
-----------------------------
    Attachment: HDFS-11282.003.patch

Thanks for the patient review, [~arpitagarwal].
{quote}
The description for the count metrics and the rate metric is the same e.g. TotalMetadataOperations and MetadataOperationRateNumOps. I am not sure that is correct.
{quote}
I looked into this, the main difference between {{MutableCounter}} and {{MutableRate}} is that the value of the former is monotonically increasing and the latter will be reset after some interval time. Others comments have been addressed in the latest patch. New patch attached, please have a review. Thanks.


> Document the missing metrics of DataNode Volume IO operations
> -------------------------------------------------------------
>
>                 Key: HDFS-11282
>                 URL: https://issues.apache.org/jira/browse/HDFS-11282
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: documentation
>    Affects Versions: 3.0.0-alpha2
>            Reporter: Yiqun Lin
>            Assignee: Yiqun Lin
>            Priority: Minor
>         Attachments: HDFS-11282.001.patch, HDFS-11282.002.patch, HDFS-11282.003.patch, metrics-rendered.png
>
>
> In HDFS-10959, it added many metrics of datanode volume io opearions. But it hasn't been documented. This JIRA addressed on this.


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