Kubernetes v1.32: QueueingHint Brings a New Possibility to Optimize Pod Scheduling

Kubernetes v1.32: QueueingHint Brings a New Possibility to Optimize Pod Scheduling Scheduling queue Scheduling framework and plugins Improvements to retrying Pod scheduling with QueuingHint QueueingHint's history and what's new in v1.32 Getting involved How can I learn more? The Kubernetes scheduler is the core component that selects the nodes on which new Pods run. The scheduler processes these new Pods one by one. Therefore, the larger your clusters, the more important the throughput of the scheduler becomes. Over the years, Kubernetes SIG Scheduling has improved the throughput of the scheduler in multiple enhancements. This blog post describes a major improvement to the scheduler in Kubernetes v1.32: a scheduling context element named QueueingHint. This page provides background knowledge of the scheduler and explains how QueueingHint improves scheduling throughput. The scheduler stores all unscheduled Pods in an internal component called the scheduling queue. The scheduling queue consists of the following data structures: ActiveQ : holds newly created Pods or Pods that are ready to be retried for scheduling. BackoffQ : holds Pods that are ready to be retried but are waiting for a backoff period to end. The backoff period depends on the number of unsuccessful scheduling attempts performed by the scheduler on that Pod. Unschedulable Pod Pool : holds Pods that the scheduler won't attempt to schedule for one of the following reasons: The scheduler previously attempted and was unable to schedule the Pods. Since that attempt, the cluster hasn't changed in a way that could make those Pods schedulable.