Sunil G commented on YARN-4494:

Thanks [~hex108] for filing this. It will speed up the recovery.
For the specific scenario mentioned here, I feel a fast recovery is better than 
blocking the entire client call. We are not sure how much time it may take for 
recovery of completed apps. So an on-demand fast recovery looks a good option, 
provided we will  keep some cache information that these fast-recovered apps 
which are  not to be recovered again.

> Recover completed apps asynchronously
> -------------------------------------
>                 Key: YARN-4494
>                 URL: https://issues.apache.org/jira/browse/YARN-4494
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: resourcemanager
>            Reporter: Jun Gong
>            Assignee: Jun Gong
> With RM HA enabled, when recovering apps, recover completed apps 
> asynchronously.

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