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https://issues.apache.org/jira/browse/YARN-3215?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wangda Tan updated YARN-3215:
-----------------------------
    Description: 
In existing CapacityScheduler, when computing headroom of an application, it 
will only consider "non-labeled" nodes of this application.

But it is possible the application is asking for labeled resources, so 
headroom-by-label (like 5G resource available under node-label=red) is required 
to get better resource allocation and avoid deadlocks such as MAPREDUCE-5928.

This JIRA could involve both API changes (such as adding a 
label-to-available-resource map in AllocateResponse) and also internal changes 
in CapacityScheduler.

> Respect labels in CapacityScheduler when computing headroom
> -----------------------------------------------------------
>
>                 Key: YARN-3215
>                 URL: https://issues.apache.org/jira/browse/YARN-3215
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: capacityscheduler
>            Reporter: Wangda Tan
>            Assignee: Wangda Tan
>
> In existing CapacityScheduler, when computing headroom of an application, it 
> will only consider "non-labeled" nodes of this application.
> But it is possible the application is asking for labeled resources, so 
> headroom-by-label (like 5G resource available under node-label=red) is 
> required to get better resource allocation and avoid deadlocks such as 
> MAPREDUCE-5928.
> This JIRA could involve both API changes (such as adding a 
> label-to-available-resource map in AllocateResponse) and also internal 
> changes in CapacityScheduler.



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