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https://issues.apache.org/jira/browse/YARN-9721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16901656#comment-16901656
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Zhankun Tang edited comment on YARN-9721 at 8/7/19 3:20 AM:
------------------------------------------------------------

[~yuan_zac], Thanks for raising this issue! This is very helpful in a hybrid 
elastic environment.

I'm checking this story to get a more clear understanding. BTW, which solution 
do you prefer?


was (Author: tangzhankun):
[~yuan_zac], Thanks for raising this issue! This is very helpful in a hybrid 
environment.

I'm checking this story to get a more clear understanding. BTW, which solution 
do you prefer?

> An easy method to exclude a nodemanager from the yarn cluster cleanly
> ---------------------------------------------------------------------
>
>                 Key: YARN-9721
>                 URL: https://issues.apache.org/jira/browse/YARN-9721
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Zac Zhou
>            Priority: Major
>         Attachments: decommission nodes.png
>
>
> If we want to take offline a nodemanager server, nodes.exclude-path
>  and "rmadmin -refreshNodes" command are used to decommission the server.
>  But this method cannot clean up the node clearly. Nodemanager servers are 
> still in Decommissioned Nodes as the attachment shows.
>   !decommission nodes.png!
> YARN-4311 enable a removalTimer to clean up the untracked node.
>  But the logic of isUntrackedNode method is to restrict. If include-path is 
> not used, no servers can meet the criteria. Using an include file would make 
> a potential risk in maintenance.
> If yarn cluster is installed on cloud, nodemanager servers are created and 
> deleted frequently. We need a way to exclude a nodemanager from the yarn 
> cluster cleanly. Otherwise, the map of rmContext.getInactiveRMNodes() would 
> keep growing, which would cause a memory issue of RM.



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