A load balancer uses sticky sessions, pinning each user to one server that keeps their session in memory. What is the main drawback?

Options

• ✗ Every request needs an extra DNS lookup
• ✓ Load can become uneven, and a server's crash logs out all of its users Correct
• ✗ Servers can no longer use TLS
• ✗ It only works with layer 4 load balancers

Why

The usual alternative is stateless servers with sessions in a shared store (such as Redis) or in a signed token, so any server can take any request and servers can be added or removed freely.

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