[jira] [Commented] (YARN-6264) AM not launched when a single vcore is available on the cluster

["Karthik Kambatla (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/YARN-6264?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15903855#comment-15903855 ] 

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

Thanks for following up on this [~yufeigu]. 

Comments on the patch:
# Let us add a comment in FSLeafQueue for why we are using the round-up version instead of the regular one. 
# There is a round-down version of the multiply which is the same as the regular one. Can we file a follow-up JIRA to get rid of it?
# In the tests, can we use assertEquals and add a message for each assert?

> 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
>
>
> In method {{canRunAppAM()}}, we should use policy related resource comparison instead of using {{Resources.fitsIn()}} to determined if the queue has enough resource for the AM. 



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