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From "Yufei Gu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-4866) FairScheduler: AMs can consume all vcores leading to a livelock when using FAIR policy
Date Thu, 26 May 2016 06:43:12 GMT

    [ https://issues.apache.org/jira/browse/YARN-4866?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15301626#comment-15301626
] 

Yufei Gu commented on YARN-4866:
--------------------------------

Thanks a lot for the review and commit, [~kasha]. 

> FairScheduler: AMs can consume all vcores leading to a livelock when using FAIR policy
> --------------------------------------------------------------------------------------
>
>                 Key: YARN-4866
>                 URL: https://issues.apache.org/jira/browse/YARN-4866
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: fairscheduler
>    Affects Versions: 2.8.0
>            Reporter: Karthik Kambatla
>            Assignee: Yufei Gu
>             Fix For: 2.9.0
>
>         Attachments: YARN-4866.001.patch, YARN-4866.002.patch, YARN-4866.003.patch, YARN-4866.004.patch,
YARN-4866.005.patch, YARN-4866.006.patch, YARN-4866.007.patch, YARN-4866.008.patch, YARN-4866.009.patch
>
>
> The maxAMShare uses the queue's policy for enforcing limits. When using FAIR policy,
this considers only memory. If there are fewer vcores on the cluster, the AMs can end up taking
all the vcores leading to a livelock. 



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