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From "Karthik Kambatla (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-6264) AM not launched when a single vcore is available on the cluster
Date Fri, 10 Mar 2017 07:11:04 GMT

    [ https://issues.apache.org/jira/browse/YARN-6264?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15904595#comment-15904595
] 

Karthik Kambatla commented on YARN-6264:
----------------------------------------

+1. Committing this.

> 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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