Jian He commented on YARN-4470:

My concern on this is that a lot of complexity is added into app/attempt state 
machine, which is already very complex. 
IIUC, all you need is a way to have the client be able to restart AM with a new 
YARN-261 already adds the ability to kill and restart current attempt, we can 
leverage that code path and provide a new AppSubmissionContext to the app

> Application Master in-place upgrade
> -----------------------------------
>                 Key: YARN-4470
>                 URL: https://issues.apache.org/jira/browse/YARN-4470
>             Project: Hadoop YARN
>          Issue Type: New Feature
>          Components: resourcemanager
>            Reporter: Giovanni Matteo Fumarola
>            Assignee: Giovanni Matteo Fumarola
>         Attachments: AM in-place upgrade design. rev1.pdf
> It would be nice if clients could ask for an AM in-place upgrade.
> It will give to YARN the possibility to upgrade the AM, without losing the 
> work
> done within its containers. This allows to deploy bug-fixes and new versions 
> of the AM incurring in long service downtimes.

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