[jira] [Created] (YARN-10163) Nodes with reused IP's will incorrectly maintain old label

["Brandon Scheller (Jira)" <ji...@apache.org>]

Brandon Scheller created YARN-10163:
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             Summary: 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


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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