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https://issues.apache.org/jira/browse/YARN-4779?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wangda Tan updated YARN-4779:
-----------------------------
    Attachment: YARN-4779.4.patch

Attached ver.4 patch.

> Fix AM container allocation logic in SLS
> ----------------------------------------
>
>                 Key: YARN-4779
>                 URL: https://issues.apache.org/jira/browse/YARN-4779
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Wangda Tan
>            Assignee: Wangda Tan
>         Attachments: YARN-4779.1.patch, YARN-4779.2.patch, YARN-4779.3.patch, 
> YARN-4779.4.patch
>
>
> Currently, SLS uses unmanaged AM for simulated map-reduce applications. And 
> first allocated container for each app is considered to be the master 
> container.
> This could be problematic when preemption happens. CapacityScheduler preempt 
> AM container at lowest priority, but the simulated AM container isn't 
> recognized by scheduler -- it is a normal container from scheduler's 
> perspective.
> This JIRA tries to fix this logic: do the real AM allocation instead of using 
> unmanaged AM.



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