Jeff Zhang commented on YARN-1743:

[~leftnoteasy] Upload a new patch 
* Change the annotation type to be Class
* Add more java doc to explain the usage of the 2 annotations
* The patch only use the annotation on ApplicationEventType, for the other 
events we can create following up jira on that.

> Decorate event transitions and the event-types with their behaviour
> -------------------------------------------------------------------
>                 Key: YARN-1743
>                 URL: https://issues.apache.org/jira/browse/YARN-1743
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Vinod Kumar Vavilapalli
>            Assignee: Jeff Zhang
>              Labels: documentation
>         Attachments: NodeManager.gv, NodeManager.pdf, YARN-1743-2.patch, 
> YARN-1743.patch
> Helps to annotate the transitions with (start-state, end-state) pair and the 
> events with (source, destination) pair.
> Not just readability, we may also use them to generate the event diagrams 
> across components.
> Not a blocker for 0.23, but let's see.

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