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From "Rohith Sharma K S (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-5751) Support UNIT for TimelineMetric
Date Thu, 20 Oct 2016 04:34:59 GMT

    [ https://issues.apache.org/jira/browse/YARN-5751?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15590763#comment-15590763

Rohith Sharma K S commented on YARN-5751:

Thanks Varun and Sangjin Lee for your thoughts. 

Definitely I agree that metric name itself can be self descriptive. Of course once the contract
between writer and reader has been set then there will no problem. But some Web UI would like
to read *as-is* from entity and display units which will give more clarity. 

May be thinking ahead of user upgrade or any other user cases(not known as far today), let
say Tez v1.0 is using ATSv2 where in elapsed time has been published as seconds. And probably,
in Tez1.5 they would like to change from seconds to minutes. Such cases, reader module(Web
UI) need not worry about reading new field and they would display *directly units*

I will downgrade priority and lets discuss more on use cases. 

> Support UNIT for TimelineMetric
> -------------------------------
>                 Key: YARN-5751
>                 URL: https://issues.apache.org/jira/browse/YARN-5751
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: ATSv2
>            Reporter: Rohith Sharma K S
>            Assignee: Rohith Sharma K S
>            Priority: Critical
> ATSv2 allows users to write its metrics using TimelineMetric. But, there is no field
to tell what is the UNIT of published metric. This is very difficult when metrics are read.

> I propose to add UNIT for TimelineMetric so that once user can use this field to tell
what is the unit of published metric.  May be this can be optional for few kind or metrics
where unit is not required say CPU. But definitely there should be a way to set units while
publishing the entities. 

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