Kuaishou’s Hybrid Cloud Architecture for High‑Concurrency Live‑Ecommerce Flash Sales

Kuaishou is a short‑video app with an enormous user base, reaching 376 million daily active users and 673 million monthly active users, generating 8 billion daily interactions, and operating massive data centers to support billions of daily visits.

The most demanding technical challenge lies in its live‑streaming e‑commerce flash‑sale scenario, where a single popular influencer’s live room can generate millions of concurrent purchase requests, with order‑submission traffic peaking at over 90 times normal levels.

To meet this demand, Kuaishou employs a distributed architecture with load balancing, caching, message queues, rate‑limiting queues, and hot‑cache optimizations, while strengthening monitoring and operations to ensure stability and high availability.

Kuaishou built an elastic container cloud platform based on Docker that automatically expands and contracts container instances according to business load, enabling rapid scaling during flash‑sale peaks and cost‑effective shrinkage afterward.

The platform integrates Kuaishou’s own IDC with Alibaba Cloud in a hybrid‑cloud setup, connecting the two via dedicated lines, leveraging Alibaba Cloud’s elastic resources for “peak shaving,” and using cross‑zone fast failover and image‑repository caching to accelerate container startup.

The hybrid‑cloud scheduling system delivers capabilities such as adding up to 100 k CPU cores within 30 minutes, unified management of on‑premise and public‑cloud resources, and intelligent scheduling that prioritizes cloud resources during spikes and releases them after the event.

During a major 2023 influencer promotion, Kuashou’s elastic container cloud, combined with Alibaba Cloud, doubled order‑throughput capacity, handling up to one million requests per second with 100 % availability, demonstrating effective rapid scaling and cost efficiency.

This successful integration validates Kuaishou’s elastic container cloud for high‑peak elasticity, sets a benchmark for the live‑ecommerce industry, and provides a solid foundation for future resource‑cost optimization and rapid scaling strategies.