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Sticky sessions.

also: sticky session · session affinity · server affinity

The load balancer sends all of one user's requests to the same server, so session data can stay in that server's memory.

the two-minute refresher

The balancer hashes a cookie or IP to pick the server.
Simple and fast: sessions live in local memory.
A server crash logs its users out, and load gets uneven.
Scaling out or draining a server breaks affinity: prefer a shared session store.

Where the course teaches it

W01 · Day 5Session Store Designlearn it →W01 · Day 5Session Store Designrevisit →

Related concepts

Stateless service
Load balancer
Session store