Robert Kanter commented on YARN-3041:

An event in the current ATS is state transitions.  For example, all of the 
stuff that goes into a jhist file (JOB_FAILED, JOB_INFO_CHANGED, etc).  See 
MAPREDUCE-5933 where I updated the MR AM to post events to the ATS for specific 

The difficulty in explicitly defining the states is that these are AM states, 
so they are framework-specific; while the ATS is YARN, so we can't do that.  
e.g. The ATS shouldn't know what a MAP_ATTEMPT_STARTED event is.

> create the ATS entity/event API
> -------------------------------
>                 Key: YARN-3041
>                 URL: https://issues.apache.org/jira/browse/YARN-3041
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: timelineserver
>            Reporter: Sangjin Lee
>            Assignee: Robert Kanter
>         Attachments: YARN-3041.preliminary.001.patch
> Per design in YARN-2928, create the ATS entity and events API.
> Also, as part of this JIRA, create YARN system entities (e.g. cluster, user, 
> flow, flow run, YARN app, ...).

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