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From "Ashwin Shankar (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-3176) In Fair Scheduler, child queue should inherit maxApp from its parent
Date Thu, 06 Aug 2015 20:40:05 GMT

    [ https://issues.apache.org/jira/browse/YARN-3176?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14660760#comment-14660760

Ashwin Shankar commented on YARN-3176:

Just trying to understand, what is the point of inheriting maxApp from parent when it is anyway
going to be enforced at the parent by looking at number of applications running at parent(which
includes number of applications running in child) ? just because you inherit maxApp at child,
that doesn't mean you can always run $maxApp at child, rather it depends on how many apps
are running in its siblings, which would be looked at and enforced at the parent.
Maybe if you can give an example illustrating your case, that would be helpful.
I can see that the UI needs to be fixed.

> In Fair Scheduler, child queue should inherit maxApp from its parent
> --------------------------------------------------------------------
>                 Key: YARN-3176
>                 URL: https://issues.apache.org/jira/browse/YARN-3176
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Siqi Li
>            Assignee: Siqi Li
>         Attachments: YARN-3176.v1.patch, YARN-3176.v2.patch
> if the child queue does not have a maxRunningApp limit, it will use the queueMaxAppsDefault.
This behavior is not quite right, since queueMaxAppsDefault is normally a small number, whereas
some parent queues do have maxRunningApp set to be more than the default

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