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https://issues.apache.org/jira/browse/YARN-2505?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14195499#comment-14195499
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Wangda Tan commented on YARN-2505:
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bq. As I understand it it is possible to run more than one nodemanager on a 
host and in that case they are distinguished by the port they listen on, so 
there is also a practical/functional reason why the port needs to be retained 
in the id. Additionally, the node id is well established as the host:port combo 
throughout, it's good to keep that consistent.
I see, I don't have strong opinion about if we should return host or host:0 
when port=0 to user. But I still prefer to support host or host:0 when user 
input hosts. :)

> Support get/add/remove/change labels in RM REST API
> ---------------------------------------------------
>
>                 Key: YARN-2505
>                 URL: https://issues.apache.org/jira/browse/YARN-2505
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: resourcemanager
>            Reporter: Wangda Tan
>            Assignee: Craig Welch
>         Attachments: YARN-2505.1.patch, YARN-2505.11.patch, 
> YARN-2505.12.patch, YARN-2505.13.patch, YARN-2505.14.patch, 
> YARN-2505.15.patch, YARN-2505.3.patch, YARN-2505.4.patch, YARN-2505.5.patch, 
> YARN-2505.6.patch, YARN-2505.7.patch, YARN-2505.8.patch, YARN-2505.9.patch, 
> YARN-2505.9.patch, YARN-2505.patch
>
>




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