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https://issues.apache.org/jira/browse/YARN-4386?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15026926#comment-15026926
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Kuhu Shukla commented on YARN-4386:
-----------------------------------

[~djp], without the patch, the decommissioned node is looked up in the list 
returned by getRMNodes() which will never have any node with 
nodestate=DECOMMISSIONED; this means that currently a decommissioned node is 
not even looked at for recommissioning since its part of inactiveNodes list and 
not the getRMNodes() list. I will continue to think of a test case for this. 
Appreciate your comments and inputs.

> refreshNodesGracefully() looks at active RMNode list for recommissioning 
> decommissioned nodes
> ---------------------------------------------------------------------------------------------
>
>                 Key: YARN-4386
>                 URL: https://issues.apache.org/jira/browse/YARN-4386
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: graceful
>    Affects Versions: 3.0.0
>            Reporter: Kuhu Shukla
>            Assignee: Kuhu Shukla
>            Priority: Minor
>         Attachments: YARN-4386-v1.patch
>
>
> In refreshNodesGracefully(), during recommissioning, the entryset from 
> getRMNodes() which has only active nodes (RUNNING, DECOMMISSIONING etc.) is 
> used for checking 'decommissioned' nodes which are present in 
> getInactiveRMNodes() map alone. 
> {code}
> for (Entry<NodeId, RMNode> entry:rmContext.getRMNodes().entrySet()) { 
> .........................
>  // Recommissioning the nodes
>         if (entry.getValue().getState() == NodeState.DECOMMISSIONING
>             || entry.getValue().getState() == NodeState.DECOMMISSIONED) {
>           this.rmContext.getDispatcher().getEventHandler()
>               .handle(new RMNodeEvent(nodeId, RMNodeEventType.RECOMMISSION));
>         }
> {code}



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