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https://issues.apache.org/jira/browse/YARN-2494?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14152078#comment-14152078
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Craig Welch commented on YARN-2494:
-----------------------------------

Not to dither about names - but "Collection" is still not terribly clear to me 
(overly generic), I was thinking previously about "Cluster" as the 
differentiator, so:

addToClusterNodeLabels(), removeFromClusterNodeLabels(), addLabelsToNode() and 
removeLabelsFromNode(). 

I think this conveys the different notions of what the operations are applying 
to in a pretty clear way.  Thoughts?

> [YARN-796] Node label manager API and storage implementations
> -------------------------------------------------------------
>
>                 Key: YARN-2494
>                 URL: https://issues.apache.org/jira/browse/YARN-2494
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: resourcemanager
>            Reporter: Wangda Tan
>            Assignee: Wangda Tan
>         Attachments: YARN-2494.patch, YARN-2494.patch, YARN-2494.patch, 
> YARN-2494.patch, YARN-2494.patch, YARN-2494.patch
>
>
> This JIRA includes APIs and storage implementations of node label manager,
> NodeLabelManager is an abstract class used to manage labels of nodes in the 
> cluster, it has APIs to query/modify
> - Nodes according to given label
> - Labels according to given hostname
> - Add/remove labels
> - Set labels of nodes in the cluster
> - Persist/recover changes of labels/labels-on-nodes to/from storage
> And it has two implementations to store modifications
> - Memory based storage: It will not persist changes, so all labels will be 
> lost when RM restart
> - FileSystem based storage: It will persist/recover to/from FileSystem (like 
> HDFS), and all labels and labels-on-nodes will be recovered upon RM restart



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