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From "Jason Lowe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-5290) ResourceManager can place more containers on a node than the node size allows
Date Thu, 23 Jun 2016 15:05:16 GMT

    [ https://issues.apache.org/jira/browse/YARN-5290?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15346569#comment-15346569
] 

Jason Lowe commented on YARN-5290:
----------------------------------

Thanks for the pointer, Jun!  This is a duplicate of YARN-4148.  I'll move this discussion
over there so we have it in one place.

> ResourceManager can place more containers on a node than the node size allows
> -----------------------------------------------------------------------------
>
>                 Key: YARN-5290
>                 URL: https://issues.apache.org/jira/browse/YARN-5290
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: resourcemanager
>            Reporter: Jason Lowe
>
> When the ResourceManager or an ApplicationMaster kills a container the RM scheduler instantly
thinks the container is dead and frees those resources within the scheduler bookkeeping. 
However that container can still be running on the node until the node heartbeats back into
the RM and is told to kill the container.  If the RM allocates the space associated with the
released container and gives it to an AM quickly enough, the AM can launch a new container
while the old container is still running on the NM.  That leads to a scenario where we're
technically running more resources on the node than the node advertised to the RM.



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