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https://issues.apache.org/jira/browse/YARN-10496?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17235683#comment-17235683
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Wangda Tan commented on YARN-10496:
-----------------------------------
Worked with [~bteke] for a design doc, see the linked doc. Would like to see
more comments from the community:
cc: [~epayne], [~jhung], [~tangzhankun], [~bilwa_st]
> [Umbrella] Support Flexible Auto Queue Creation in Capacity Scheduler
> ---------------------------------------------------------------------
>
> Key: YARN-10496
> URL: https://issues.apache.org/jira/browse/YARN-10496
> Project: Hadoop YARN
> Issue Type: New Feature
> Components: capacity scheduler
> Reporter: Wangda Tan
> Priority: Major
>
> CapacityScheduler today doesn’t support an auto queue creation which is
> flexible enough. The current constraints:
> * Only leaf queues can be auto-created
> * A parent can only have either static queues or dynamic ones. This causes
> multiple constraints. For example:
> * It isn’t possible to have a VIP user like Alice with a static queue
> root.user.alice with 50% capacity while the other user queues (under
> root.user) are created dynamically and they share the remaining 50% of
> resources.
>
> * In comparison, FairScheduler allows the following scenarios, Capacity
> Scheduler doesn’t:
> ** This implies that there is no possibility to have both dynamically
> created and static queues at the same time under root
> * A new queue needs to be created under an existing parent, while the parent
> already has static queues
> * Nested queue mapping policy, like in the following example:
> |<rule name="nestedUserQueue" create=”true”>
> <rule name="primaryGroup" create="true" />
> </rule>|
> * Here two levels of queues may need to be created
> If an application belongs to user _alice_ (who has the primary_group of
> _engineering_), the scheduler checks whether _root.engineering_ exists, if it
> doesn’t, it’ll be created. Then scheduler checks whether
> _root.engineering.alice_ exists, and creates it if it doesn't.
>
> When we try to move users from FairScheduler to CapacityScheduler, we face
> feature gaps which blocks users migrate from FS to CS.
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