Karthik Kambatla commented on YARN-3643:

Since setting max-completed-applications to 0 keeps only running applications 
in the store, YARN-2962 is not as critical and can wait until 3.0.0. Do you 

> Provide a way to store only running applications in the state store
> -------------------------------------------------------------------
>                 Key: YARN-3643
>                 URL: https://issues.apache.org/jira/browse/YARN-3643
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: resourcemanager
>    Affects Versions: 2.7.0
>            Reporter: Karthik Kambatla
>            Assignee: Varun Saxena
> Today, we have a config that determines the number of applications that can 
> be stored in the state-store. Since there is no easy way to figure out the 
> maximum number of running applications at any point in time, users are forced 
> to use a conservative estimate. Our default ends up being even more 
> conservative.
> It would be nice to allow storing all running applications with a 
> conservative upper bound for it. This should allow for shorter recovery times 
> in most deployments. 

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