Sunil G commented on YARN-4413:

Hi [~templedf]
Thank you for raising this ticket.
As you mentioned, I could see that a node is moved from exclude to include list 
and performed {{-refreshNodes}}. And this caused some counts still to be 
displayed in UI. But a restart will help here to clear the metrics.

One point to note here. The way I see it, I do not think we can remove or reset 
this decommissioned count directly by only seeing the include list. There can 
be cases where we would have done {{graceful decommissioning}}, and this can 
add few nodes to decommissioned list which is not one-to-one mapped with 
exclude list.
So I feel we could look both lists upon refresh and remove/add nodes based on 
the entries in both files and from memory.

> Nodes in the includes list should not be listed as decommissioned in the UI
> ---------------------------------------------------------------------------
>                 Key: YARN-4413
>                 URL: https://issues.apache.org/jira/browse/YARN-4413
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: resourcemanager
>    Affects Versions: 2.7.1
>            Reporter: Daniel Templeton
>            Assignee: Daniel Templeton
> If I decommission a node and then move it from the excludes list back to the 
> includes list, but I don't restart the node, the node will still be listed by 
> the web UI as decomissioned until either the NM or RM is restarted.  Ideally, 
> removing the node from the excludes list and putting it back into the 
> includes list should cause the node to be reported as shutdown instead.
> CC [~kshukla]

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