Junping Du commented on YARN-3401:

We also need to make sure compatibility between old version application and new 
version timeline service. Typically, it won't be the case. But just put here as 
a reminder.

> [Data Model] users should not be able to create a generic TimelineEntity and 
> associate arbitrary type
> -----------------------------------------------------------------------------------------------------
>                 Key: YARN-3401
>                 URL: https://issues.apache.org/jira/browse/YARN-3401
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: timelineserver
>            Reporter: Sangjin Lee
>            Assignee: Naganarasimha G R
> IIUC it is possible for users to create a generic TimelineEntity and set an 
> arbitrary entity type. For example, for a YARN app, the right entity API is 
> ApplicationEntity. However, today nothing stops users from instantiating a 
> base TimelineEntity class and set the application type on it. This presents a 
> problem in handling these YARN system entities in the storage layer for 
> example.
> We need to ensure that the API allows only the right type of the class to be 
> created for a given entity type.

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