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https://issues.apache.org/jira/browse/YARN-4677?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16499699#comment-16499699
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Wilfred Spiegelenburg commented on YARN-4677:
---------------------------------------------
Attached a new version of the branch-2 patch which fixes the comments so we can
get the fix checked in and finalised.
> RMNodeResourceUpdateEvent update from scheduler can lead to race condition
> --------------------------------------------------------------------------
>
> Key: YARN-4677
> URL: https://issues.apache.org/jira/browse/YARN-4677
> Project: Hadoop YARN
> Issue Type: Sub-task
> Components: graceful, resourcemanager, scheduler
> Affects Versions: 2.7.1
> Reporter: Brook Zhou
> Assignee: Wilfred Spiegelenburg
> Priority: Major
> Attachments: YARN-4677-branch-2.001.patch,
> YARN-4677-branch-2.002.patch, YARN-4677-branch-2.003.patch, YARN-4677.01.patch
>
>
> When a node is in decommissioning state, there is time window between
> completedContainer() and RMNodeResourceUpdateEvent get handled in
> scheduler.nodeUpdate (YARN-3223).
> So if a scheduling effort happens within this window, the new container could
> still get allocated on this node. Even worse case is if scheduling effort
> happen after RMNodeResourceUpdateEvent sent out but before it is propagated
> to SchedulerNode - then the total resource is lower than used resource and
> available resource is a negative value.
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