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From "Gour Saha (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-4148) When killing app, RM releases app's resource before they are released by NM
Date Thu, 27 Oct 2016 22:18:58 GMT

    [ https://issues.apache.org/jira/browse/YARN-4148?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15613445#comment-15613445
] 

Gour Saha commented on YARN-4148:
---------------------------------

Hi [~jlowe] do you have any further feedback on [~hex108]'s comments? Would you be providing
a trunk patch also? 

> When killing app, RM releases app's resource before they are released by NM
> ---------------------------------------------------------------------------
>
>                 Key: YARN-4148
>                 URL: https://issues.apache.org/jira/browse/YARN-4148
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: resourcemanager
>            Reporter: Jun Gong
>            Assignee: Jason Lowe
>         Attachments: YARN-4148.001.patch, YARN-4148.wip.patch, free_in_scheduler_but_not_node_prototype-branch-2.7.patch
>
>
> When killing a app, RM scheduler releases app's resource as soon as possible, then it
might allocate these resource for new requests. But NM have not released them at that time.
> The problem was found when we supported GPU as a resource(YARN-4122).  Test environment:
a NM had 6 GPUs, app A used all 6 GPUs, app B was requesting 3 GPUs. Killed app A, then RM
released A's 6 GPUs, and allocated 3 GPUs to B. But when B tried to start container on NM,
NM found it didn't have 3 GPUs to allocate because it had not released A's GPUs.
> I think the problem also exists for CPU/Memory. It might cause OOM when memory is overused.



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