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https://issues.apache.org/jira/browse/YARN-4719?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15176248#comment-15176248
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Karthik Kambatla commented on YARN-4719:
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[~rkanter] - this code touches the adaptive max allocation you have worked on. 
Mind taking a look to make sure I didn't screw up any of that. 

> Add a helper library to maintain node state and allows common queries
> ---------------------------------------------------------------------
>
>                 Key: YARN-4719
>                 URL: https://issues.apache.org/jira/browse/YARN-4719
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: scheduler
>    Affects Versions: 2.8.0
>            Reporter: Karthik Kambatla
>            Assignee: Karthik Kambatla
>         Attachments: yarn-4719-1.patch, yarn-4719-2.patch, yarn-4719-3.patch
>
>
> The scheduler could use a helper library to maintain node state and allowing 
> matching/sorting queries. Several reasons for this:
> # Today, a lot of the node state management is done separately in each 
> scheduler. Having a single library will take us that much closer to reducing 
> duplication among schedulers.
> # Adding a filtering/matching API would simplify node labels and locality 
> significantly. 
> # An API that returns a sorted list for a custom comparator would help 
> YARN-1011 where we want to sort by allocation and utilization for 
> continuous/asynchronous and opportunistic scheduling respectively. 



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