Architecture Case Study: logistics

Global Logistics State

"Your fleet operates in dead zones. Drivers lose connection, updates get lost, and your operations center is always working with stale data. When trucks reconnect, data conflicts corrupt your inventory counts and delivery ETAs."

CONSTRAINT: Offline-First Sync (50k Nodes)

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Technical Implementation

Event Sourcing with CRDT merge strategy. Each edge device maintains a local event log. Events are immutable facts (GPS_UPDATE, STATUS_CHANGE, DELIVERY_COMPLETE). On reconnect, logs merge using Last-Write-Wins with Vector Clocks for causal ordering. The global state is a materialized view of all merged events.

ADR: DECISION: Event Sourcing + CRDTs over traditional CRUD sync. RATIONALE: CRUD sync creates write conflicts when offline devices reconnect simultaneously. Event Sourcing treats conflicts as features—divergent histories merge deterministically. CRDTs guarantee eventual consistency without manual conflict resolution.