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CKA study material · question 579 of 1000

An etcd cluster has lost quorum and cannot elect a leader. What is the effect on the Kubernetes cluster?

  1. Reads fail but writes are queued until a leader returns
  2. Existing Pods are evicted to protect data consistency
  3. No change to cluster state is accepted, so no new Pod can be scheduled
  4. The API server switches to its in-memory cache and continues normally
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Answer: C. No change to cluster state is accepted, so no new Pod can be scheduled

An unstable etcd means no leader, and without a leader the cluster cannot make any change to its current state — which is why nothing new can be scheduled.

Source: Operating etcd clusters for Kubernetes (Kubernetes) — Prerequisites

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