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https://issues.apache.org/jira/browse/YARN-4148?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15813168#comment-15813168
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Junping Du commented on YARN-4148:
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Yes, I agree that the two test failures are not related to the patch. Thanks
[~jlowe] for reminding me. Committing it now.
> 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-4148.002.patch,
> YARN-4148.003.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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