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https://issues.apache.org/jira/browse/YARN-4406?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15036203#comment-15036203
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Daniel Templeton commented on YARN-4406:
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Now that I've had a chance to look at the web UI code, I see that my theory was
close, but not quite. The number of decommissioned nodes is taken from
{{ClusterMetrics.getMetrics().getDecomissionedNMs()}}, which is just the count
of nodes in the excludes list. The list of decommissioned nodes comes from
{{ResourceManager.getRMContext().getInactiveRMNodes()}}, which contains only
nodes that have been decommissioned since the last restart.
> RM Web UI continues to show decommissioned nodes even after RM restart
> ----------------------------------------------------------------------
>
> Key: YARN-4406
> URL: https://issues.apache.org/jira/browse/YARN-4406
> Project: Hadoop YARN
> Issue Type: Bug
> Components: resourcemanager
> Reporter: Ray Chiang
> Priority: Minor
>
> If you start up a cluster, decommission a NodeManager, and restart the RM,
> the decommissioned node list will still show a positive number (1 in the case
> of 1 node) and if you click on the list, it will be empty.
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