Wangda Tan commented on YARN-4024:

[~zhiguohong], thanks for update, patch generally looks good, could you take a 
look at findbugs warning? 
bq. FindBugs    module:hadoop-yarn-server-resourcemanager
Sometimes it shows 0 findbugs when you click at the findbugs report link, but 
it has some bugs. You can go to yarn-resourcemanager project to run "mvn clean 

> 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
>            Reporter: Wangda Tan
>            Assignee: Hong Zhiguo
>         Attachments: YARN-4024-draft-v2.patch, YARN-4024-draft-v3.patch, 
> YARN-4024-draft.patch, YARN-4024-v4.patch, YARN-4024-v5.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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