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Date: Fri, 8 Aug 2014 07:22:12 +0000 (UTC)
From: "Sandy Ryza (JIRA)" <jira@apache.org>
To: yarn-issues@hadoop.apache.org
Message-ID: <JIRA.12652721.1371147425511.41355.1407482532600@arcas>
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Subject: [jira] [Commented] (YARN-807) When querying apps by queue,
 iterating over all apps is inefficient and limiting
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    [ https://issues.apache.org/jira/browse/YARN-807?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14090420#comment-14090420 ] 

Sandy Ryza commented on YARN-807:
---------------------------------

bq. If you think it's a bug, we can resolve it in YARN-2385. 

bq. We may need to create a Map<queue-name, app-id> in RMContext.
It's also worth considering only holding this map for completed applications, so we don't need to keep two maps for running applications.

> 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: Improvement
>    Affects Versions: 2.0.4-alpha
>            Reporter: Sandy Ryza
>            Assignee: Sandy Ryza
>             Fix For: 2.3.0
>
>         Attachments: YARN-807-1.patch, YARN-807-2.patch, YARN-807-3.patch, YARN-807-4.patch, YARN-807.patch
>
>
> 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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