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From "Rohith Sharma K S (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-5561) [Atsv2] : Support for ability to retrieve apps/app-attempt/containers and entities via REST
Date Thu, 13 Oct 2016 06:13:20 GMT

    [ https://issues.apache.org/jira/browse/YARN-5561?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15570985#comment-15570985

Rohith Sharma K S commented on YARN-5561:

Thanks for clarifications.. 

Though utility class is very useful for converting reports, one major concern is number of
REST calls to be invoked by user. Especially in Web, this will become 2 REST calls which decrease
the performance.

Basically, me and Li lu was thinking to embedded TimelineYARNEntityReaderWebService to timelinereader
daemon with REST path */ws/v2/applicationhistory*. These REST end points would take care of
retrieving entities from storage and convert to required YARN reports such as ApplicationAttemptReport
or ContainerReport etc. 
bq. Also, please note that what's contained in the current REST output would likely to be
a superset of *Report;
I agree that current *Report would be subset of TimelineEntity object. So , this we can solve
by defining new *Report which compatible with ATSv2 either by extending current *reports since
metrics are required. If any new fields published to ATS, then It is contract between publisher
and reader that these information fields should added in *Report. New *report class is only
wrapper over TimelineRntity object for YARN entities. And at any point of time, if user thinks
he need more informations, he can query from ATSv2 which is always open.

> [Atsv2] : Support for ability to retrieve apps/app-attempt/containers and entities via
> -------------------------------------------------------------------------------------------
>                 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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