Daniel Templeton commented on YARN-4494:

Thanks for filing the JIRA, [~hex108]. One reason why the app recovery is 
synchronous is that asynchronous recovery can cause the RM to tell a client 
that a job doesn't exist, when it really just hasn't been recovered yet, which 
is an issue even with completed jobs.  How are you planning to handle that?

> 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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