Sunil G commented on YARN-4143:

Yes [~adhoot]. I am also not getting any other way other than this Event 
handling. Because RMAppAttempt need to update such information to Schedulers 
(common), and either an Event or an API is only a clean way here.

I do not have any objection here for existing way what is done in the  patch. 
Thought of bringing up all possible options here and weigh in the  best. 

> Optimize the check for AMContainer allocation needed by blacklisting and 
> ContainerType
> --------------------------------------------------------------------------------------
>                 Key: YARN-4143
>                 URL: https://issues.apache.org/jira/browse/YARN-4143
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Anubhav Dhoot
>            Assignee: Anubhav Dhoot
>         Attachments: YARN-4143.001.patch
> In YARN-2005 there are checks made to determine if the allocation is for an 
> AM container. This happens in every allocate call and should be optimized 
> away since it changes only once per SchedulerApplicationAttempt

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