Capacity Planning and Flow Control
summary
Alibaba lays out a four‑stage capacity plan: traffic estimation, single‑machine stress testing, system‑wide Full-link Pressure Test, and runtime flow control. Single‑machine methods include simulated requests, real‑request replication, and request redirection; the pressure test runs a control node plus thousands of workers with a lightweight CSS engine to hit >10 million req/s and peaks like 180,000 req/s, uses data masking and shader isolation for writes, finds hundreds of hidden failures (700+ in one 2013 run), and combines control rules with response‑time formulas to prevent cascading collapse.
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