Exploring the effect of Topology Aware Hints on network traffic in Amazon Elastic Kubernetes Service

Kubernetes is introducing Topology Aware Hint, a feature that biases traffic routing based on origin within an AZ, in order to optimize latency and reduce inter-AZ data transfer costs for workloads running on Amazon EKS clusters. The feature sets a zone label on endpoint objects and instructs the kube-proxy to filter endpoints based on zone hints, routing traffic to the specified AZ for better performance while still providing the benefit of resiliency with multiaz architecture.