Hadoop QA commented on YARN-596:

{color:red}-1 overall{color}.  Here are the results of testing the latest 
  against trunk revision .

    {color:red}-1 patch{color}.  The patch command could not apply the patch.

Console output: https://builds.apache.org/job/PreCommit-YARN-Build/3806//console

This message is automatically generated.

> In fair scheduler, intra-application container priorities affect 
> inter-application preemption decisions
> -------------------------------------------------------------------------------------------------------
>                 Key: YARN-596
>                 URL: https://issues.apache.org/jira/browse/YARN-596
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: scheduler
>    Affects Versions: 2.0.3-alpha
>            Reporter: Sandy Ryza
>            Assignee: Sandy Ryza
>         Attachments: YARN-596.patch, YARN-596.patch, YARN-596.patch, 
> YARN-596.patch, YARN-596.patch, YARN-596.patch, YARN-596.patch
> In the fair scheduler, containers are chosen for preemption in the following 
> way:
> All containers for all apps that are in queues that are over their fair share 
> are put in a list.
> The list is sorted in order of the priority that the container was requested 
> in.
> This means that an application can shield itself from preemption by 
> requesting it's containers at higher priorities, which doesn't really make 
> sense.
> Also, an application that is not over its fair share, but that is in a queue 
> that is over it's fair share is just as likely to have containers preempted 
> as an application that is over its fair share.

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