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From "Sangjin Lee (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-4238) createdTime and modifiedTime is not reported while publishing entities to ATSv2
Date Fri, 18 Dec 2015 22:55:46 GMT

    [ https://issues.apache.org/jira/browse/YARN-4238?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15064910#comment-15064910
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Sangjin Lee commented on YARN-4238:
-----------------------------------

Thanks [~varun_saxena] for the summary, and [~Naganarasimha] for bringing up the matter.

To elaborate on a couple of points, although the modified time was introduced early in the
data model, I don't think we had things like queries based on the modified time in mind. It
was suggested more for the usefulness in terms of troubleshooting ("when was the entity last
written to?"), but not much more. One analogy may be the often-present modified timestamp
columns in SQL tables.

Other than that, I'm generally agreeing with Varun's summary. At minimum, the modified timestamp
should not be set by clients. And we should probably drop the modified time from the schema
in general. We can leave it in the data model, but I'm still not 100% sure if we even need
to bother with that. I'd like to hear your thoughts.

> createdTime and modifiedTime is not reported while publishing entities to ATSv2
> -------------------------------------------------------------------------------
>
>                 Key: YARN-4238
>                 URL: https://issues.apache.org/jira/browse/YARN-4238
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: timelineserver
>    Affects Versions: YARN-2928
>            Reporter: Varun Saxena
>            Assignee: Varun Saxena
>              Labels: yarn-2928-1st-milestone
>         Attachments: YARN-4238-YARN-2928.01.patch, YARN-4238-feature-YARN-2928.002.patch,
YARN-4238-feature-YARN-2928.003.patch, YARN-4238-feature-YARN-2928.02.patch
>
>
> While publishing entities from RM and elsewhere we are not sending created time. For
instance, created time in TimelineServiceV2Publisher class and for other entities in other
such similar classes is not updated. We can easily update created time when sending application
created event. Likewise for modification time on every write.



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