Semantic pattern · Fan-in queue / bottleneck

Fan-in Queue & Ingress Bottleneck Analysis

Multiple ingress traffic sources converge on a bounded 5-slot queue buffer before processing by a constrained worker service.

Fan-in Queue and Bottleneck Analysis Interactive step-by-step demonstration of fan-in request ingress, queue buffering, rate-limiting, and worker service processing. INGRESS SOURCES Web Client App Rate: 4 req/sec (Steady) Mobile Native API Rate: 3 req/sec (Steady) Payment Webhooks Rate: 8 req/sec (Spike) Legacy ERP Batch Rate: 12 req/sec (Spike) Central Ingress Queue Buffer Capacity: 5 slots (Bounded FIFO) Slot 1: req_web_8019 [GET /api] Slot 2: req_mob_4412 [POST /auth] DEPTH 2/5 Slot 3: req_pay_9920 [WEBHOOK] Slot 4: req_erp_1044 [BATCH] Slot 5: req_erp_1045 [FULL] FULL 5/5 WARN 429 Rate Limiter & Overflow Sink Status: 429 Backpressure (19 req/sec Shed) Constrained Worker Service Instance: Worker-Node-01 Service Capacity: 8 req/sec max Status: PROCESSING [FIFO] Downstream Database & Core API Result: 200 OK Admitted Traffic Stream (8 req/sec) System State: Controlled Equilibrium Worker Protected · Backpressure Active
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