There are two types of queues: parent queues and leaf queues.

Parent queues enable the management of resources across organizations and sub- organizations. They can contain more parent queues or leaf queues. They do not themselves accept any application submissions directly.

Leaf queues are the queues that live under a parent queue and accept applications. Leaf queues do not have any child queues, and therefore do not have any configuration property that ends with ".queues".

There is a top-level parent root queue that does not belong to any organization, but instead represents the cluster itself.

Using parent and leaf queues, administrators can specify capacity allocations for various organizations and sub-organizations.