Rohith Sharma K S commented on YARN-4494:

+1 for the idea. It really helps faster RM service availability. We see in our 
test cluster takes around 15 or more seconds to make RM service up when state 
store has completed apps around 100K apps. 
Best way to make service up faster is configure less max-completed apps and use 
Timeline Server to store history data.

> 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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