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From "Masatake Iwasaki (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-12561) Add documentation about metrics system
Date Sat, 07 Nov 2015 16:18:11 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-12561?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14995270#comment-14995270
] 

Masatake Iwasaki commented on HADOOP-12561:
-------------------------------------------

I don't meant to duplicate existing resources. I would like to add information I felt hard
to find while working on HADOOP-12511, such as how metrics name is defined, what the tag is,
possible values, allowed data types and characters, how entries in hadoop-metrics2.properties
works... I would like overview of metrics classes too. It would works as where-to-see for
existing javadocs.

> Add documentation about metrics system
> --------------------------------------
>
>                 Key: HADOOP-12561
>                 URL: https://issues.apache.org/jira/browse/HADOOP-12561
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: documentation
>            Reporter: Masatake Iwasaki
>            Assignee: Masatake Iwasaki
>
> Though there is [reference of metric items|https://hadoop.apache.org/docs/r2.7.1/hadoop-project-dist/hadoop-common/Metrics.html],
we have no documentation about metrics system and configuration. Adding concise documentation
about metrics system would help users, admins and developers.



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