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https://issues.apache.org/jira/browse/YARN-3446?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15081685#comment-15081685
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Karthik Kambatla commented on YARN-3446:
----------------------------------------

Sorry for not looking at this since the last update. Looks like the patch 
doesn't apply anymore. 

[~zxu] - mind updating the patch? I ll take a look more promptly this time. 

> FairScheduler HeadRoom calculation should exclude nodes in the blacklist.
> -------------------------------------------------------------------------
>
>                 Key: YARN-3446
>                 URL: https://issues.apache.org/jira/browse/YARN-3446
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: fairscheduler
>            Reporter: zhihai xu
>            Assignee: zhihai xu
>         Attachments: YARN-3446.000.patch, YARN-3446.001.patch, 
> YARN-3446.002.patch, YARN-3446.003.patch
>
>
> FairScheduler HeadRoom calculation should exclude nodes in the blacklist.
> MRAppMaster does not preempt the reducers because for Reducer preemption 
> calculation, headRoom is considering blacklisted nodes. This makes jobs to 
> hang forever(ResourceManager does not assign any new containers on 
> blacklisted nodes but availableResource AM get from RM includes blacklisted 
> nodes available resource).
> This issue is similar as YARN-1680 which is for Capacity Scheduler.



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