[jira] [Commented] (YARN-4677) RMNodeResourceUpdateEvent update from scheduler can lead to race condition

["Greg Phillips (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/YARN-4677?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16464361#comment-16464361 ] 

Greg Phillips commented on YARN-4677:
-------------------------------------

[~wilfreds] - The provided branch-2 patch passes unit testing, and doesn't appear to generate any additional warnings.

> 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-4677.01.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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