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https://issues.apache.org/jira/browse/YARN-6264?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15903923#comment-15903923
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Yufei Gu commented on YARN-6264:
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Hi [~DjvuLee], changed the description to answer your question.
> 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
>
>
> 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 preemption happens and assign a new
> container to AM.
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