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Building Blocks5

Distributed Patterns4

Consistent Hashing
Replication, Quorums and Consensus
Reliability Patterns — Timeouts, Retries, Circuit Breakers
Microservices Communication and Observability

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Building Blocks5

Distributed Patterns4

Consistent Hashing
Replication, Quorums and Consensus
Reliability Patterns — Timeouts, Retries, Circuit Breakers
Microservices Communication and Observability

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Replication, Quorums and Consensus

How multiple copies of the same data stay (mostly) in agreement, what a quorum actually buys you, and how a cluster picks a leader without a coin flip.

12 min readUpdated 2026-09-03system-designdistributed-systemsconsensusreplication