title: In HA Kubernetes cluster with stacked etcd topology, wether the data in different etcd member are the same or not?
body: <p>We use HA Kubernetes by <a href="https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/ha-topology/#stacked-etcd-topology" rel="nofollow noreferrer">Stacked etcd topology</a>.<br />
  It says that:</p>
  <blockquote>
  <p>Each control plane node creates a local etcd member and this etcd member communicates only with the kube-apiserver of this node.</p>
  </blockquote>
  <p>1.1. So the etcd member in Stacked etcd topology <strong>will not sync</strong> data to each other?<br />
  1.2. If so, when a request arrives at LB, it will be forward to a random control plane node. If there are no data on this control plane node, how it works?</p>
  <p>2.1. If the etcd member in Stacked etcd topology <strong>will sync</strong> data to each other, how it works and what's the difference between Stacked etcd topology and <a href="https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/ha-topology/#external-etcd-topology" rel="nofollow noreferrer">External etcd topology</a>?</p>