In Hadoop YARN's Capacity Scheduler, the yarn.scheduler.capacity..maximum-capacity parameter is used to define a hard limit on the percentage of cluster resources a specific queue can utilize. This prevents a single queue from monopolizing the entire cluster, even when resources are idle. For a queue named QueueA under the root queue, the correct parameter is yarn.scheduler.capacity.root.QueueA.maximum-capacity. This ensures that QueueA's resource consumption does not exceed the configured percentage of its parent's (root's) capacity, providing elasticity while maintaining control over resource allocation.

A. yarn.scheduler.capacity.root.QueueA.user-limit-factor controls the maximum resources a single user can acquire within the queue, not the total limit for the queue itself.

B. yarn.scheduler.capacity.root.QueueA.minimum-user-limit-percent sets a guaranteed minimum resource percentage for each user, ensuring fairness among users, not the queue's maximum cap.

C. yarn.scheduler.capacity.root.QueueA.state is an administrative parameter used to set the queue's operational state to either RUNNING or STOPPED, not to configure resource limits.

1. Apache Hadoop 3.3.6 Documentation, YARN Resource Management and Scheduler, Capacity Scheduler.

Reference: In the section "Queue Properties," the parameter yarn.scheduler.capacity..maximum-capacity is described as: "The maximum capacity of the queue... It’s a hard limit that prevents a single queue from using a disproportionate amount of cluster resources." This directly supports the correct answer D. The same section also defines user-limit-factor, minimum-user-limit-percent, and state, confirming their different purposes.

Location: Apache Hadoop Official Documentation -> YARN -> Capacity Scheduler -> Configuration -> Queue Properties.

2. Huawei FusionInsight HD 6.5.1 Product Documentation, Administrator Guide, YARN Configuration.

Reference: The guide details YARN service configuration parameters. Under the Capacity Scheduler settings, yarn.scheduler.capacity.root..maximum-capacity is specified as the parameter to set the "Maximum queue capacity (%)." This aligns with the official Apache Hadoop documentation and confirms its use in the Huawei ecosystem.

Location: Huawei Support -> FusionInsight HD -> Product Documentation -> Administrator Guide -> Appendix -> YARN Configuration Parameters. (Specific document ID: 31188851, Section: "Capacity Scheduler").