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https://issues.apache.org/jira/browse/YARN-5051?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15273825#comment-15273825
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tangshangwen commented on YARN-5051:
------------------------------------
when the nodemanager start will trigger the AddNodeTransition, the node in the
NEW state, will not reduce the value of DecommisionedNMs value.
{code:title=RMNodeImpl.java|borderStyle=solid}
Rpublic static class AddNodeTransition implements
SingleArcTransition<RMNodeImpl, RMNodeEvent> {
@Override
public void transition(RMNodeImpl rmNode, RMNodeEvent event) {
// Inform the scheduler
RMNodeStartedEvent startEvent = (RMNodeStartedEvent) event;
List<NMContainerStatus> containers = null;
String host = rmNode.nodeId.getHost();
if (rmNode.context.getInactiveRMNodes().containsKey(host)) {
// Old node rejoining
RMNode previouRMNode = rmNode.context.getInactiveRMNodes().get(host);
rmNode.context.getInactiveRMNodes().remove(host);
rmNode.updateMetricsForRejoinedNode(previouRMNode.getState());
} else {
ClusterMetrics.getMetrics().incrNumActiveNodes();
{code}
> The RM can't update the Decommissioned Nodes Metric
> ---------------------------------------------------
>
> Key: YARN-5051
> URL: https://issues.apache.org/jira/browse/YARN-5051
> Project: Hadoop YARN
> Issue Type: Bug
> Components: resourcemanager
> Affects Versions: 2.7.1
> Reporter: tangshangwen
> Assignee: tangshangwen
> Attachments: rm.png
>
>
> When the RM restart，the RM will refuse the Decommission NodeManager register,
> and I put the NM host removed from exclude_mapred_host file, execute the
> command
> {noformat}
> yarn rmadmin -refreshNodes
> {noformat}
> start nodemanager , the decommissioned nodes num can not update
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