Delivering Messages at the scale of the World Cup
Blog post from Firebase
Firebase Cloud Messaging’s experience supporting the 2022 World Cup illustrates how major live events can create abrupt, global notification spikes requiring extensive preparation. During the Argentina–France final, FCM delivered more than 115 billion notifications to over 400 million users and saw traffic rise from an 18 million QPS baseline to a 46 million QPS peak within seconds. Effective preparation involves forecasting traffic from historical data, provisioning redundant capacity early, locating infrastructure near traffic sources and destinations, and checking high-percentile dependency latency and availability. The account recommends isolating event traffic from regular workloads, configuring load balancers to distribute sudden bursts across nearby regions, and using layered safeguards such as server-side throttling and per-sender quotas. It also discusses choosing between vertical and horizontal scaling based on workload bottlenecks, and emphasizes realistic load testing on separate infrastructure that reproduces rapid, irregular traffic patterns rather than only sustained peak volumes.
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