Wangda Tan created YARN-3132:

             Summary: RMNodeLabelsManager should remove node from node-to-label 
mapping when node becomes deactivated
                 Key: YARN-3132
             Project: Hadoop YARN
          Issue Type: Sub-task
            Reporter: Wangda Tan
            Assignee: Wangda Tan

Using an example to explain:
1) Admin specify host1 has label=x
2) node=host1:123 registered
3) Get node-to-label mapping, return host1/host1:123
4) node=host1:123 unregistered
5) Get node-to-label mapping, still returns host1:123

Probably we should remove host1:123 when it becomes deactivated and no directly 
label assigned to it (directly assign means admin specify host1:123 has x 
instead of host1 has 123).

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