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https://issues.apache.org/jira/browse/YARN-6793?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yufei Gu resolved YARN-6793.
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Resolution: Duplicate
> Duplicated reservation in Fair Scheduler preemption
> ----------------------------------------------------
>
> Key: YARN-6793
> URL: https://issues.apache.org/jira/browse/YARN-6793
> Project: Hadoop YARN
> Issue Type: Bug
> Components: fairscheduler
> Affects Versions: 2.8.1, 3.0.0-alpha3
> Reporter: Yufei Gu
> Assignee: Yufei Gu
> Priority: Critical
>
> There is a delay between preemption happen and containers are killed. If
> resources released from nodes before container killing are not enough for the
> resource request preemption asking for, reservation happens again at that
> node.
> E.g. scheduler reserves <memory 2048, vcore 2> in node 1 for app 1 while
> preemption. It will take 15s by default to kill containers in node 1 for
> fulfill that resource requests. If <memory 1024, vcore 1> was released from
> node 1 before the killing, scheduler reserves <memory 2048, vcore 2> again in
> node 1 for app1. The second reservation may never be unreserved.
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