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https://issues.apache.org/jira/browse/YARN-3446?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15098617#comment-15098617
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zhihai xu commented on YARN-3446:
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[~kasha], thanks for the review and committing the patch!
> 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
> Fix For: 2.9.0
>
> Attachments: YARN-3446.000.patch, YARN-3446.001.patch,
> YARN-3446.002.patch, YARN-3446.003.patch, YARN-3446.004.patch,
> YARN-3446.005.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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