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https://issues.apache.org/jira/browse/YARN-9925?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16973462#comment-16973462
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Manikandan R commented on YARN-9925:
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+1 for the patch. Can we stress the point through more examples?
Instead of
{quote}Currently, CapacityScheduler does not allow two queues with same name.
For example, root.a.a1 and root.b.a1 are not allowed as both have same name a1
irrespective of the hierarchy
{quote}
Can we have something like this as it also covers the duplicate queue name at
parent level?
{quote}Currently, CapacityScheduler does not allow two queues with same name
irrespective of hierarchy or position. For example, root.a.a1 and root.b.a1 are
not allowed. root.a.b.c and root.a.d.b.e
{quote}
Also, I am not really sure whether existing users (who wants to upgrade to this
version) would be going through the doc changes. Would it be helpful if we can
convey this point either somewhere in release notes or upgrade notes as caveat?
> CapacitySchedulerQueueManager allows unsupported Queue hierarchy
> ----------------------------------------------------------------
>
> Key: YARN-9925
> URL: https://issues.apache.org/jira/browse/YARN-9925
> Project: Hadoop YARN
> Issue Type: Bug
> Components: capacityscheduler
> Affects Versions: 3.3.0
> Reporter: Prabhu Joseph
> Assignee: Prabhu Joseph
> Priority: Major
> Attachments: YARN-9925-001.patch, YARN-9925-002.patch,
> YARN-9925-003.patch, YARN-9925-004.patch
>
>
> CapacitySchedulerQueueManager allows unsupported Queue hierarchy. When
> creating a queue with same name as an existing parent queue name - it has to
> fail with below.
> {code:java}
> Caused by: java.io.IOException: A is moved from:root.A to:root.B.A after
> refresh, which is not allowed.Caused by: java.io.IOException: A is moved
> from:root.A to:root.B.A after refresh, which is not allowed. at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacitySchedulerQueueManager.validateQueueHierarchy(CapacitySchedulerQueueManager.java:335)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacitySchedulerQueueManager.reinitializeQueues(CapacitySchedulerQueueManager.java:180)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.reinitializeQueues(CapacityScheduler.java:762)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.reinitialize(CapacityScheduler.java:473)
> ... 70 more
> {code}
> In Some cases, the error is not thrown while creating the queue but thrown at
> submission of job "Failed to submit application_1571677375269_0002 to YARN :
> Application application_1571677375269_0002 submitted by user : systest to
> non-leaf queue : B"
> Below scenarios are allowed but it should not
> {code:java}
> It allows root.A.A1.B when root.B.B1 already exists.
>
> 1. Add root.A
> 2. Add root.A.A1
> 3. Add root.B
> 4. Add root.B.B1
> 5. Allows Add of root.A.A1.B
> It allows two root queues:
>
> 1. Add root.A
> 2. Add root.B
> 3. Add root.A.A1
> 4. Allows Add of root.A.A1.root
>
> {code}
> Below scenario is handled properly:
> {code:java}
> It does not allow root.B.A when root.A.A1 already exists.
>
> 1. Add root.A
> 2. Add root.B
> 3. Add root.A.A1
> 4. Does not Allow Add of root.B.A
> {code}
> This error handling has to be consistent in all scenarios.
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