Answer
Compare-and-swap with resourceVersion ensures linearizable writes.
Quick Answer
All writes to a single etcd key are serialized by etcd's Raft protocol. The API server includes the resourceVersion in writes — etcd rejects writes where the version doesn't match current (optimistic locking). The Raft leader serializes competing writes to the same key — only one succeeds per revision. This provides single-object write linearizability.
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ