Ming Ma commented on YARN-4024:

Thanks for the good improvement [~leftnoteasy], [~zhiguohong], [~sunilg], 
[~adhoot]!  For cache timeout interval, should we change the semantics of -1 as 
"cache forever" and 0 as "no cache" to be more consistent with JVM setting 

> 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: Improvement
>          Components: resourcemanager
>            Reporter: Wangda Tan
>            Assignee: Hong Zhiguo
>             Fix For: 2.8.0
>         Attachments: YARN-4024-draft-v2.patch, YARN-4024-draft-v3.patch, 
> YARN-4024-draft.patch, YARN-4024-v4.patch, YARN-4024-v5.patch, 
> YARN-4024-v6.patch, YARN-4024-v7.patch
> 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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