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From "Sangjin Lee (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-5561) [Atsv2] : Support for ability to retrieve apps/app-attempt/containers and entities via REST
Date Wed, 12 Oct 2016 18:48:20 GMT

    [ https://issues.apache.org/jira/browse/YARN-5561?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15569553#comment-15569553
] 

Sangjin Lee commented on YARN-5561:
-----------------------------------

I recognize the pain point you're mentioning in terms of wanting the data in the form of {{ApplicationAttemptReport}}
or {{ContainerReport}}. That said, adding a new daemon should not be done lightly. I am in
the opinion that the bar above which a new component is added to the system should be high.
I'm not sure if this meets that bar.

Also, please note that what's contained in the current REST output would likely to be a *superset*
of {{*Report}}; in other words, there are things in the entity API that are not in the {{*Report}}.
Things like the uid and the currently discussed entity id prefix come to mind. So we cannot
simply replace the return type, or things will be crippled.

As we briefly discussed during the call the other day, what we need is a translation layer
that can create a Report object out of the timeline entity. If we implement such a translation
layer, would it satisfy this? That way, the client gets the full timeline entity information,
and it can convert it into a report object fairly easily without writing much code.

> [Atsv2] : Support for ability to retrieve apps/app-attempt/containers and entities via
REST
> -------------------------------------------------------------------------------------------
>
>                 Key: YARN-5561
>                 URL: https://issues.apache.org/jira/browse/YARN-5561
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: timelinereader
>            Reporter: Rohith Sharma K S
>            Assignee: Rohith Sharma K S
>         Attachments: 0001-YARN-5561.YARN-5355.patch, YARN-5561.02.patch, YARN-5561.03.patch,
YARN-5561.patch, YARN-5561.v0.patch
>
>
> ATSv2 model lacks retrieval of {{list-of-all-apps}}, {{list-of-all-app-attempts}} and
{{list-of-all-containers-per-attempt}} via REST API's. And also it is required to know about
all the entities in an applications.
> It is pretty much highly required these URLs for Web  UI.
> New REST URL would be 
> # GET {{/ws/v2/timeline/apps}}
> # GET {{/ws/v2/timeline/apps/\{app-id\}/appattempts}}.
> # GET {{/ws/v2/timeline/apps/\{app-id\}/appattempts/\{attempt-id\}/containers}}
> # GET {{/ws/v2/timeline/apps/\{app id\}/entities}} should display list of entities that
can be queried.  



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