[jira] [Commented] (YARN-7619) Max AM Resource value in Capacity Scheduler UI has to be refreshed for every user

["Jason Lowe (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/YARN-7619?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16596922#comment-16596922 ] 

Jason Lowe commented on YARN-7619:
----------------------------------

The branch-2.8 version of this patch unfortunately affected the 2.8 REST API when it modified the ResourceInfo DAO class.  See YARN-8730 for details.

> Max AM Resource value in Capacity Scheduler UI has to be refreshed for every user
> ---------------------------------------------------------------------------------
>
>                 Key: YARN-7619
>                 URL: https://issues.apache.org/jira/browse/YARN-7619
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: capacity scheduler, yarn
>    Affects Versions: 2.9.0, 3.0.0-beta1, 2.8.2, 3.1.0
>            Reporter: Eric Payne
>            Assignee: Eric Payne
>            Priority: Major
>             Fix For: 3.1.0, 2.10.0, 2.9.1, 3.0.1, 2.8.4
>
>         Attachments: Max AM Resources is Different for Each User.png, YARN-7619.001.patch, YARN-7619.002.patch, YARN-7619.003.patch, YARN-7619.004.branch-2.8.patch, YARN-7619.004.branch-3.0.patch, YARN-7619.004.patch, YARN-7619.005.branch-2.8.patch, YARN-7619.005.branch-3.0.patch, YARN-7619.005.patch
>
>
> YARN-7245 addressed the problem that the {{Max AM Resource}} in the capacity scheduler UI used to contain the queue-level AM limit instead of the user-level AM limit. It fixed this by using the user-specific AM limit that is calculated in {{LeafQueue#activateApplications}}, stored in each user's {{LeafQueue#User}} object, and retrieved via {{UserInfo#getResourceUsageInfo}}.
> The problem is that this user-specific AM limit depends on the activity of other users and other applications in a queue, and it is only calculated and updated when a user's application is activated. So, when {{CapacitySchedulerPage}} retrieves the user-specific AM limit, it is a stale value unless an application was recently activated for a particular user.



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