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https://issues.apache.org/jira/browse/YARN-10124?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17040271#comment-17040271
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Prabhu Joseph commented on YARN-10124:
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Below are the observations after testing the patch with setting a parent queue
to 0% capacity.
1. Leaf queues under the parent queue which is set with 0% capacity won't
accept any new apps. The already running apps will get resources based on the
queue max capacity.
2. When there is a used resource in the queue, then it is above its hard limit
0%.
2. The used resources is preemptible when the other queue has demand and under
the configured capacity, cluster is full.
3. Root queue cannot be set to 0%, it will be always 100%.
> Remove restriction of ParentQueue capacity zero when childCapacities > 0
> ------------------------------------------------------------------------
>
> Key: YARN-10124
> URL: https://issues.apache.org/jira/browse/YARN-10124
> Project: Hadoop YARN
> Issue Type: Bug
> Components: capacity scheduler
> Affects Versions: 3.3.0
> Reporter: Prabhu Joseph
> Assignee: Prabhu Joseph
> Priority: Major
> Attachments: YARN-10124-001.patch
>
>
> ParentQueue capacity cannot be set to 0 when child capacities > 0. To disable
> a parent queue temporarily, user can only STOP the queue but the capacity of
> the queue cannot be used for other queues. Allowing 0 capacity for parent
> queue will allow user to use the capacity for other queues and also to retain
> the child queue capacity values. (else user has to set all child queue
> capacities to 0)
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