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https://issues.apache.org/jira/browse/YARN-796?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14387310#comment-14387310
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Jian Fang commented on YARN-796:
--------------------------------

I took a look at ApplicationSubmissionContext.amContainerLabelExpression and am 
not sure if I understand the logic correctly. Seems the 
amContainerLabelExpression was only set in RMWebServices, not the RPC client. 
How would this value be populated for a regular mapreduce job then?

Furthermore, as a hadoop service provider, people may want a mechanism to hook 
in a global label expression for all MR jobs. For example, in EC2, we don't 
want to launch AMs on any spot instances. It is not a good idea to ask 
individual users to configure this from their own job clients. Instead, it is 
preferable to configure this within hadoop itself by the hadoop platform 
provider.

> Allow for (admin) labels on nodes and resource-requests
> -------------------------------------------------------
>
>                 Key: YARN-796
>                 URL: https://issues.apache.org/jira/browse/YARN-796
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>    Affects Versions: 2.4.1
>            Reporter: Arun C Murthy
>            Assignee: Wangda Tan
>         Attachments: LabelBasedScheduling.pdf, 
> Node-labels-Requirements-Design-doc-V1.pdf, 
> Node-labels-Requirements-Design-doc-V2.pdf, 
> Non-exclusive-Node-Partition-Design.pdf, YARN-796-Diagram.pdf, 
> YARN-796.node-label.consolidate.1.patch, 
> YARN-796.node-label.consolidate.10.patch, 
> YARN-796.node-label.consolidate.11.patch, 
> YARN-796.node-label.consolidate.12.patch, 
> YARN-796.node-label.consolidate.13.patch, 
> YARN-796.node-label.consolidate.14.patch, 
> YARN-796.node-label.consolidate.2.patch, 
> YARN-796.node-label.consolidate.3.patch, 
> YARN-796.node-label.consolidate.4.patch, 
> YARN-796.node-label.consolidate.5.patch, 
> YARN-796.node-label.consolidate.6.patch, 
> YARN-796.node-label.consolidate.7.patch, 
> YARN-796.node-label.consolidate.8.patch, YARN-796.node-label.demo.patch.1, 
> YARN-796.patch, YARN-796.patch4
>
>
> It will be useful for admins to specify labels for nodes. Examples of labels 
> are OS, processor architecture etc.
> We should expose these labels and allow applications to specify labels on 
> resource-requests.
> Obviously we need to support admin operations on adding/removing node labels.



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