Szilard Nemeth commented on YARN-8468:

Hey [~bsteinbach]!
Thanks for the updated patch.
LGTM, +1 (non-binding)

> Limit container sizes per queue in FairScheduler
> ------------------------------------------------
>                 Key: YARN-8468
>                 URL: https://issues.apache.org/jira/browse/YARN-8468
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: resourcemanager
>    Affects Versions: 3.1.0
>            Reporter: Antal Bálint Steinbach
>            Assignee: Antal Bálint Steinbach
>            Priority: Critical
>              Labels: patch
>         Attachments: YARN-8468.000.patch, YARN-8468.001.patch, 
> YARN-8468.002.patch, YARN-8468.003.patch
> When using any scheduler, you can use "yarn.scheduler.maximum-allocation-mb" 
> to limit the overall size of a container. This applies globally to all 
> containers and cannot be limited by queue or and is not scheduler dependent.
> The goal of this ticket is to allow this value to be set on a per queue basis.
> The use case: User has two pools, one for ad hoc jobs and one for enterprise 
> apps. User wants to limit ad hoc jobs to small containers but allow 
> enterprise apps to request as many resources as needed. Setting 
> yarn.scheduler.maximum-allocation-mb sets a default value for maximum 
> container size for all queues and setting maximum resources per queue with 
> “maxContainerResources” queue config value.
> Suggested solution:
> All the infrastructure is already in the code. We need to do the following:
>  * add the setting to the queue properties for all queue types (parent and 
> leaf), this will cover dynamically created queues.
>  * if we set it on the root we override the scheduler setting and we should 
> not allow that.
>  * make sure that queue resource cap can not be larger than scheduler max 
> resource cap in the config.
>  * implement getMaximumResourceCapability(String queueName) in the 
> FairScheduler
>  * implement getMaximumResourceCapability() in both FSParentQueue and 
> FSLeafQueue as follows
>  * expose the setting in the queue information in the RM web UI.
>  * expose the setting in the metrics etc for the queue.
>  * write JUnit tests.
>  * update the scheduler documentation.

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