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https://issues.apache.org/jira/browse/YARN-4001?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14654144#comment-14654144
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Lei Guo commented on YARN-4001:
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[~zhiguohong], can you share some number about the execution time in your
profiling?
> 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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