Siddharth Seth commented on YARN-4207:

[~rhaase] - thanks for taking this up.
Along with the change to FinalApplicationStatus, a change is also required to 
the proto definition (yarn_protos.proto). There'll be a set of converter 
methods which translate between the proto and FinalApplicationStatus which will 
also need to be changed.

Other than that, I believe adding this additional value is a safe change.

> Add a non-judgemental YARN app completion status
> ------------------------------------------------
>                 Key: YARN-4207
>                 URL: https://issues.apache.org/jira/browse/YARN-4207
>             Project: Hadoop YARN
>          Issue Type: Improvement
>            Reporter: Sergey Shelukhin
>              Labels: trivial
>         Attachments: YARN-4207.patch
> For certain applications, it doesn't make sense to have SUCCEEDED or FAILED 
> end state. For example, Tez sessions may include multiple DAGs, some of which 
> have succeeded and some have failed; there's no clear status for the session 
> both logically and from user perspective (users are confused either way). 
> There needs to be a status not implying success or failure, such as 
> "done"/"ended"/"finished".

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