Wangda Tan commented on YARN-4024:

[~zhiguohong], I noticed YARN-4001 after filed YARN-4024, since we have some 
discussions on YARN-4024 already. I suggest to close YARN-4001 and feel free to 
assign this one to you.

> 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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