Subru Krishnan commented on YARN-4496:

+1. Thanks [~asuresh] for initiating this. To add more context, our deployments 
are fairly large with multiple secondaries which is resulting in considerable 
connection latencies based on the current failover proxy.

> Improve HA ResourceManager Failover detection on the client
> -----------------------------------------------------------
>                 Key: YARN-4496
>                 URL: https://issues.apache.org/jira/browse/YARN-4496
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: client, resourcemanager
>            Reporter: Arun Suresh
>            Assignee: Arun Suresh
> HDFS deployments can currently use the {{RequestHedgingProxyProvider}} to 
> improve Namenode failover detection in the client. It does this by 
> concurrently trying all namenodes and picks the namenode that returns the 
> fastest with a successful response as the active node.
> It would be useful to have a similar ProxyProvider for the Yarn RM (it can 
> possibly be done by converging some the class hierarchies to use the same 
> ProxyProvider)
> This would especially be useful for large YARN deployments with multiple 
> standby RMs where clients will be able to pick the active RM without having 
> to traverse a list of configured RMs. 

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