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https://issues.apache.org/jira/browse/YARN-10163?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17601205#comment-17601205
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Samrat Deb commented on YARN-10163:
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[~ykabusalah] , [~bdscheller] can i pick this up ?
> Nodes with reused IP's will incorrectly maintain old label
> ----------------------------------------------------------
>
> Key: YARN-10163
> URL: https://issues.apache.org/jira/browse/YARN-10163
> Project: Hadoop YARN
> Issue Type: Bug
> Components: resourcemanager
> Affects Versions: 2.8.5
> Reporter: Brandon Scheller
> Assignee: Yousef Abu-Salah
> Priority: Minor
>
> Take a long running cluster, where nodemanagers come and go as the number of
> instances scale up and down. This can cause an issue with Yarn nodelabels
> where an unlabeled node picks up the label of the previous node with a
> matching ip.
> In this scenario, node ip's could be reused and a new node could come up
> taking the place of a previously labeled node. If the old node was labeled,
> but the new node is not labeled, the new node will not send a node label
> update and the old nodelabel will remain. This can cause issues as the node
> now is mislabeled.
>
> The fix for this likely is to send node label updates even when a node is
> unlabeled. This will allow the resourcemanger to reset the label to empty for
> that node.
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