System Design: The Sharded Counters
Define the challenge of scaling counters in high-traffic applications, where millions of concurrent writes lead to severe lock contention. Explore why traditional counting methods fail under the heavy hitters problem. Understand the necessity of sharded counters in System Design to handle massive write throughput reliably.
Problem statement
Large-scale social platforms such as Facebook, Twitter, and YouTube process high volumes of concurrent user traffic. Users generate continuous read and write operations, including views, likes, and comments. For example, a post from an account with millions of followers can receive a very high number of likes immediately after ...