Chapter Assessment: Consensus and Distributed Locks

This is the chapter review for Consensus and Distributed Locks. The bank holds twenty questions and each attempt draws ten, so repeating it gives you different coverage. Only a few questions ask how a protocol works. Most ask whether you need one, because the recurring mistake here is reaching for consensus when a lease, a transaction or a partition would have been enough. Two numbers are worth remembering outright: the request and storage limits of a widely used coordination store, and why clusters are sized at three or five rather than four or six