Sunil G created YARN-2693:

             Summary: Priority Label Manager in RM to manage priority labels
                 Key: YARN-2693
             Project: Hadoop YARN
          Issue Type: Sub-task
          Components: resourcemanager
            Reporter: Sunil G
            Assignee: Sunil G

Focus of this JIRA to have a centralized service to handle priority labels.

Support operations such as
* Add/Delete priority label to a specified queue
* Manage integer mapping associated with each priority label
* Support managing default priority label of a given queue
* ACL support in queue level for priority label
* Expose interface to RM to validate priority label

Storage for this labels will be done in FileSystem and in Memory similar to 

* FileSystem Based : persistent across RM restart
* Memory Based: non-persistent across RM restart

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