[ https://issues.apache.org/jira/browse/YARN-6175?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Yufei Gu updated YARN-6175:
---------------------------
    Attachment: YARN-6175.002.patch

> Negative vcore for resource needed to preempt
> ---------------------------------------------
>
>                 Key: YARN-6175
>                 URL: https://issues.apache.org/jira/browse/YARN-6175
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: fairscheduler
>    Affects Versions: 2.8.0
>            Reporter: Yufei Gu
>            Assignee: Yufei Gu
>         Attachments: YARN-6175.001.patch, YARN-6175.002.patch
>
>
> Both old preemption code (2.8 and before) and new preemption code could have negative vcores while calculating resources needed to preempt.
> For old preemption, you can find following messages in RM logs:
> {code}
> Should preempt <memory:2048, vCores:-2> 
> {code}
> The related code is in method {{resourceDeficit()}}. 
> For new preemption code, there are no messages in RM logs, the related code is in method {{fairShareStarvation()}}. 
> The negative value isn't only a display issue, but also may cause missing necessary preemption. 



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