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https://issues.apache.org/jira/browse/YARN-11079?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17719596#comment-17719596
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ASF GitHub Bot commented on YARN-11079:
---------------------------------------
szilard-nemeth closed pull request #5380: YARN-11079. Make an
AbstractParentQueue to store common ParentQueue and ManagedParentQueue
functionality
URL: https://github.com/apache/hadoop/pull/5380
> Make an AbstractParentQueue to store common ParentQueue and
> ManagedParentQueue functionality
> --------------------------------------------------------------------------------------------
>
> Key: YARN-11079
> URL: https://issues.apache.org/jira/browse/YARN-11079
> Project: Hadoop YARN
> Issue Type: Sub-task
> Components: capacity scheduler
> Reporter: Benjamin Teke
> Assignee: Susheel Gupta
> Priority: Major
> Labels: pull-request-available
>
> ParentQueue is an instantiable class which stores the necessary functionality
> of parent queues, however it is also extended by the
> AbstractManagedParentQueue, which is an abstract class for storing managed
> parent queue functionality. Since legacy AQC doesn't allow dynamic queues
> next to static ones, managed parent queues technically behave like leaf
> queues by not having any static child queues when created. This structure and
> behaviour is really error prone, as for example if someone is not completely
> aware of this and simply changes the checking order by first checking if the
> queue in question is a ParentQueue in a method like
> MappingRuleValidationContextImpl.isDynamicParent can result a completely
> wrong return value (as a ManagedParent is a dynamic parent, but currently
> it's also a ParentQueue, and ManagedParent cannot have the
> isEligibleForAutoQueueCreation as true, so the method will return false).
> {code:java}
> private boolean isDynamicParent(CSQueue queue) {
> if (queue == null) {
> return false;
> }
> if (queue instanceof ManagedParentQueue) {
> return true;
> }
> if (queue instanceof ParentQueue) {
> return ((ParentQueue)queue).isEligibleForAutoQueueCreation();
> }
> return false;
> }
> {code}
> Similarly to YARN-11024 an AbstractParentQueue class should be created to
> completely separate the managed parents from the instantiable ParentQueue
> class.
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