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https://issues.apache.org/jira/browse/YARN-4001?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wangda Tan resolved YARN-4001.
------------------------------
    Resolution: Duplicate

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

> normalizeHostName takes too much of execution time
> --------------------------------------------------
>
>                 Key: YARN-4001
>                 URL: https://issues.apache.org/jira/browse/YARN-4001
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: nodemanager, resourcemanager
>            Reporter: Hong Zhiguo
>            Assignee: Hong Zhiguo
>            Priority: Minor
>
> For each NodeHeartbeatRequest, NetUtils.normalizeHostName is called under a 
> lock.  I did profiling for a very large cluster and found out 
> NetUtils.normalizeHostName takes most execution time of 
> ResourceTrackerService.nodeHeartbeat(...).
> We'd better have an option to use raw IP (plus port) as the Node identity to 
> scale for large clusters.



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