How LinkedIn Rebuilt Its Feed: FollowFeed Explained
Every time you open LinkedIn, your feed is built from scratch. For 400 million members, in about a tenth of a second. For years that feed ran on a search engine built for something else, until the cost stopped making sense. A team spent twenty months replacing it. The new system, FollowFeed, is five times faster, holds twenty times more data, and runs on half the servers. The trick behind all three numbers is that your feed is never stored at all. The animated version: You follow people and com…