What is the Kubernetes API server’s resource versioning (resourceVersion) and how does it prevent concurrent modification issues?

Question

Kubernetes Fundamentals — Hard

What is the Kubernetes API server’s resource versioning (resourceVersion) and how does it prevent concurrent modification issues?

Accepted Answer

The Kubernetes API server's resourceVersion is a crucial mechanism for preventing concurrent modification issues. It represents a specific state of an object as an opaque string, or etcd revision. By including the current resourceVersion in updates, the API server can reject changes if the resource has been modified since the client last read it. This ensures optimistic concurrency control.