Wangda Tan commented on YARN-2896:

I have same question as [~eepayne], beyond readability (user can know priority 
of an app is "high" instead of -1), is there any must-have reason to make 
priority to be text? 

Priority setting in other systems like 
Linux: http://www.ibm.com/developerworks/library/l-lpic1-v3-103-6/
Moab: https://computing.llnl.gov/tutorials/moab/#Priority
Slurm: https://computing.llnl.gov/linux/slurm/priority_multifactor.html
Are all using numbers, math operations can be applied on priorities, such as 
job_priority = queue_priority * user_priority.


> Server side PB changes for Priority Label Manager and Admin CLI support
> -----------------------------------------------------------------------
>                 Key: YARN-2896
>                 URL: https://issues.apache.org/jira/browse/YARN-2896
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: api, resourcemanager
>            Reporter: Sunil G
>            Assignee: Sunil G
>         Attachments: 0001-YARN-2896.patch, 0002-YARN-2896.patch, 
> 0003-YARN-2896.patch, 0004-YARN-2896.patch
> Common changes:
>  * PB support changes required for Admin APIs 
>  * PB support for File System store (Priority Label Store)

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