Wangda Tan commented on YARN-4024:

Thanks for sharing your thoughts, [~sunilg].
I think we can clear cache every X seconds, it will be an option like 
max-ip-caching time, and -1 will disable cache. Sounds like a plan?

> YARN RM should avoid unnecessary resolving IP when NMs doing heartbeat
> ----------------------------------------------------------------------
>                 Key: YARN-4024
>                 URL: https://issues.apache.org/jira/browse/YARN-4024
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Wangda Tan
> Currently, YARN RM NodesListManager will resolve IP address every time when 
> node doing heartbeat. When DNS server becomes slow, NM heartbeat will be 
> blocked and cannot make progress.

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