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From "Sandy Ryza (JIRA)" <j...@apache.org>
Subject [jira] [Created] (YARN-807) When querying apps by queue, iterating over all apps is inefficient and limiting
Date Thu, 13 Jun 2013 18:17:20 GMT
Sandy Ryza created YARN-807:
-------------------------------

             Summary: When querying apps by queue, iterating over all apps is inefficient
and limiting 
                 Key: YARN-807
                 URL: https://issues.apache.org/jira/browse/YARN-807
             Project: Hadoop YARN
          Issue Type: Bug
    Affects Versions: 2.0.4-alpha
            Reporter: Sandy Ryza
            Assignee: Sandy Ryza


The question "which apps are in queue x" can be asked via the RM REST APIs, through the ClientRMService,
and through the command line.  In all these cases, the question is answered by scanning through
every RMApp and filtering by the app's queue name.

All schedulers maintain a mapping of queues to applications.  I think it would make more sense
to ask the schedulers which applications are in a given queue. This is what was done in MR1.
This would also have the advantage of allowing a parent queue to return all the applications
on leaf queues under it, and allow queue name aliases, as in the way that "root.default" and
"default" refer to the same queue in the fair scheduler.



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