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https://issues.apache.org/jira/browse/YARN-10506?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17264855#comment-17264855
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Gergely Pollak commented on YARN-10506:
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Hi [~gandras] [~wangda],
*1) How we deal with "create" flag of ApplicationPlacementContext?* **
I don't think we need this flag at all. The CapacityScheduler has the
information where can be dynamic queues created, it is supplied via the
configuration option {{queue-path.auto-queue-creation-v2.enabled}}
and
{{queue-path.auto-queue-creation.enabled }}
So at any point the CS will be aware if a supplied queue path is creatable.
Mapping rules will return a path based on their configuration, but I don't
think the placement rule should be overriding the CS configuration. This can
cause some undesired issues, and we really don't get anything with it. It will
be a little more inconvenient for the user since they have to configure the
mapping rules AND the CS queues properly, but it doesn't look like a big deal.
On the other hand there are multiple places in the code which check if a queue
can be created and all these places use the queue hierarchy to determine
whether a queue is a managed parent, or not, however if the Mapping Rules are
allowed to circumvent this, it might lead to unforeseen inconsistencies. (As a
matter of fact the CSMappingPlacementRule currently uses the information from
CS to determine if a queue can be created or not, so it wouldn't set any of
these flags differently then CS is configured anyway)
So I would say let's omit the creation flags from the
ApoplicationPlacementContext, let the CSMappingPlacementRule rely on the
information provided by the CS about queue creation eligibility, and let it
pass back a "regular" ApplicationPlacementContext with the desired queue path,
then the CS will be able to create it if the configuration allows. This is a
much easier and stable solution, while we don't really put extra administration
overhead to the user, and also can be easily extended in the future.
As I see circumventing protections are never a good idea even if we are talking
about internal interfaces, and these flags would exactly do that, they would
force the CS to create queues which are against it's configuration.
> Update queue creation logic to use weight mode and allow the flexible
> static/dynamic creation
> ---------------------------------------------------------------------------------------------
>
> Key: YARN-10506
> URL: https://issues.apache.org/jira/browse/YARN-10506
> Project: Hadoop YARN
> Issue Type: Sub-task
> Reporter: Benjamin Teke
> Assignee: Andras Gyori
> Priority: Major
> Attachments: YARN-10506-006-10504-010.patch,
> YARN-10506-007-10504-010.patch, YARN-10506-008.patch, YARN-10506-010.patch,
> YARN-10506-012.patch, YARN-10506.001.patch, YARN-10506.002.patch,
> YARN-10506.003.patch, YARN-10506.004.patch, YARN-10506.005.patch,
> YARN-10506.006-combined.patch, YARN-10506.006.patch, YARN-10506.007.patch,
> YARN-10506.009.patch, YARN-10506.011.patch
>
>
> The queue creation logic should be updated to use weight mode and support the
> flexible creation.
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