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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