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https://issues.apache.org/jira/browse/YARN-4597?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15569200#comment-15569200
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Arun Suresh commented on YARN-4597:
-----------------------------------

What i meant was, the current patch does not need synchronized collections ( 
unlike the {{QueuingContainerManager}} ), since it runs on the same thread as 
the ContainerManager's AsyncDispatcher.
I will update the patch with using a linkedblockingqueue shortly.

> Add SCHEDULE to NM container lifecycle
> --------------------------------------
>
>                 Key: YARN-4597
>                 URL: https://issues.apache.org/jira/browse/YARN-4597
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: nodemanager
>            Reporter: Chris Douglas
>            Assignee: Arun Suresh
>         Attachments: YARN-4597.001.patch, YARN-4597.002.patch
>
>
> Currently, the NM immediately launches containers after resource 
> localization. Several features could be more cleanly implemented if the NM 
> included a separate stage for reserving resources.



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