⏱ 5 min read Order State Machine An order progresses through a defined set of states with controlled transitions: CART → PLACED → PAYMENT_PENDING […] Read article

⏱ 5 min read Fixed Window Counter and Its Problem The simplest rate limiter increments a counter per time window and resets it at Read article

⏱ 5 min read The Tolerant Reader Pattern The tolerant reader pattern (Martin Fowler, 2011) describes how a service should consume data from external Read article

⏱ 5 min read Compatibility Definitions Schema evolution is the ability to change a data schema over time without breaking producers and consumers that Read article

⏱ 5 min read The Bulkhead Analogy A ship's hull is divided into watertight compartments (bulkheads). If one compartment floods, the others remain dry Read article

⏱ 5 min read Why Retry Policies Matter Transient failures — network blips, momentary overload, upstream restarts — are normal in distributed systems. A Read article

⏱ 5 min read What Is an Idempotency Service? An idempotency service ensures that duplicate requests — caused by client retries, network timeouts, or Read article

⏱ 10 min read The Write Scaling Bottleneck In a standard primary-replica setup, all writes go through a single primary database. The primary's write Read article

⏱ 9 min read Read Scaling Overview Read scaling addresses the most common bottleneck in production systems: reads vastly outnumber writes (often 10:1 to Read article

⏱ 9 min read What Are CRDTs? A Conflict-free Replicated Data Type (CRDT) is a data structure with a mathematically defined merge operation that Read article

⏱ 9 min read What Is Multi-Master Replication? In multi-master replication, all nodes are primaries — every node accepts both reads and writes simultaneously. Read article

⏱ 9 min read What Is Active-Passive Architecture? In an active-passive architecture, a single primary node handles all incoming traffic — reads and writes. Read article

⏱ 9 min read What Is Active-Active Architecture? In an active-active architecture, multiple regions (or data centers) simultaneously accept writes and serve reads. Every Read article

⏱ 9 min read Single-Leader Model In leader-follower (primary-replica) replication, all writes are routed to a single designated leader. The leader applies writes to Read article

⏱ 9 min read CAS Semantics Compare-and-swap (CAS) is a single atomic operation: compare the current value at a memory location with an expected Read article