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https://issues.apache.org/jira/browse/YARN-6264?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yufei Gu updated YARN-6264:
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Attachment: YARN-6264.006.patch
> AM not launched when a single vcore is available on the cluster
> ---------------------------------------------------------------
>
> Key: YARN-6264
> URL: https://issues.apache.org/jira/browse/YARN-6264
> Project: Hadoop YARN
> Issue Type: Bug
> Components: fairscheduler
> Reporter: Yufei Gu
> Assignee: Yufei Gu
> Attachments: YARN-6264.001.patch, YARN-6264.002.patch,
> YARN-6264.003.patch, YARN-6264.004.patch, YARN-6264.005.patch,
> YARN-6264.006.patch
>
>
> In method {{canRunAppAM()}}, we will get a zero vcore if there is only one
> vcores, and the {{maxAMShare}} is between 0 and 1 because
> {{Resources#multiply}} round down double to a integer by default. This
> potentially happens frequently when assigning a container to AM just after
> preemption happens since it is more likely there is only one vcore on the
> cluster just after preemption.
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