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From "Naganarasimha G R (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-3390) RMTimelineCollector should have the context info of each app
Date Thu, 02 Apr 2015 18:25:55 GMT

    [ https://issues.apache.org/jira/browse/YARN-3390?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14393095#comment-14393095

Naganarasimha G R commented on YARN-3390:

Hi [~zjshen], [~djp] & [~sjlee0]
{{TimelineCollector.getTimelineEntityContext()}} interface will not be suitable for the RMTimelineCollector
as it will be posting/putting entities for multiple apps, appattempts and containers. Hence
was initially planning to modify this method to take a {{TimelineEntity.Identifier}} as a
parameter and @ RMTimelineCollector planning to hold a  map of {{TimelineEntity.Identifier
to AppId}} and another Map to hold {{AppId to TimelineEntityContext}} (required as context
is created per app when appCreatedEvent occurs). 
But one more conflict which i can see is AppLevelTimelineCollector is specific for a app,
so invoking {{getTimelineEntityContext}} in {{getTimelineEntityContext(TimelineEntities ,Ugi)}}
is fine because all the entities which are posted can be assumed to have same context as they
belong to a single app but in a general case (like RMTimelineCollector) its not guaranteed
that all TimelineEntities belong to same app(i.e. TimelineEntities might have diff context).
so would it be better to change the interface of {{TimelineCollector.putEntities)}} to accept
the {{TimelineEntityContext}} as parameter and remove {{TimelineCollector.getTimelineEntityContext()}}
method from interface ? please share your opinion...

> RMTimelineCollector should have the context info of each app
> ------------------------------------------------------------
>                 Key: YARN-3390
>                 URL: https://issues.apache.org/jira/browse/YARN-3390
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: timelineserver
>            Reporter: Zhijie Shen
>            Assignee: Zhijie Shen
> RMTimelineCollector should have the context info of each app whose entity  has been put

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