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From "Karthik Kambatla (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 04:48:12 GMT

    [ https://issues.apache.org/jira/browse/YARN-4866?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15301521#comment-15301521
] 

Karthik Kambatla commented on YARN-4866:
----------------------------------------

+1. Checking this in. 

> 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
>         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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