Sharding, Replication, and Hot Partitions

Consistency, Latency, and Availability Trade-offs

Hard practice on choosing consistency models, latency budgets, availability goals, and user-visible correctness.

SLOs, Error Budgets, and Incident Readiness

Hard practice on SLI/SLO design, alert quality, error budgets, incident response, runbooks, and reliability governance.

Leader Election, Clocks, and Coordination

Hard practice on distributed coordination, leases, fencing tokens, clock issues, ordering, and leader-election failure modes.

Distributed Transactions, Sagas, and Idempotency

Hard practice on multi-service workflows, sagas, compensation, outbox patterns, idempotent consumers, and reconciliation.

Cost, Complexity, and Operational Trade-offs

Hard practice on choosing practical designs under cost, team maturity, operational risk, and maintainability constraints.

Replication, Quorums, and Consensus

Hard practice on replica sets, quorum reads/writes, consensus, leader-based replication, lag, and distributed correctness.

Graceful Degradation and Load Shedding

Hard practice on preserving critical journeys during overload, optional dependency failure, load shedding, bulkheads, and fallbacks.

Object Storage, Search, and Analytical Stores

Hard practice on blob storage, search indexes, warehouses, lake-style storage, data pipelines, and derived-store consistency.