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From "Aihua Xu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-9116) Capacity Scheduler: add the default maximum-allocation-mb and maximum-allocation-vcores for the queues
Date Fri, 04 Jan 2019 17:34:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-9116?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16734369#comment-16734369
] 

Aihua Xu commented on YARN-9116:
--------------------------------

[~cheersyang] That was my initial idea (see YARN-9055) that we can override the parent setting,
but it introduces incompatibility since it's always assumed that the child queue can't have
larger settings than the parents. Some clients such as spark will check the top settings and
fail immediately if the resource request can't be satisfied.

> Capacity Scheduler: add the default maximum-allocation-mb and maximum-allocation-vcores
for the queues
> ------------------------------------------------------------------------------------------------------
>
>                 Key: YARN-9116
>                 URL: https://issues.apache.org/jira/browse/YARN-9116
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: capacity scheduler
>    Affects Versions: 2.7.0
>            Reporter: Aihua Xu
>            Assignee: Aihua Xu
>            Priority: Major
>         Attachments: YARN-9116.1.patch
>
>
> YARN-1582 adds the support of maximum-allocation-mb configuration per queue which is
targeting to support larger container features on dedicated queues (larger maximum-allocation-mb/maximum-allocation-vcores
for such queue) . While to achieve larger container configuration, we need to increase the
global maximum-allocation-mb/maximum-allocation-vcores (e.g. 120G/256) and then override those
configurations with desired values on the queues since queue configuration can't be larger
than cluster configuration. There are many queues in the system and if we forget to configure
such values when adding a new queue, then such queue gets default 120G/256 which typically
is not what we want.  
> We can come up with a queue-default configuration (set to normal queue configuration
like 16G/8), so the leaf queues gets such values by default.



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