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Scale LineLesson

Horizontal scaling with a stateless tier

Grow by adding identical servers — it works once they hold no state, you keep one spare, and the shared database keeps up.

10 minEasyStation: Horizontal scaling with a stateless tier

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  1. Split app and database tiers
  2. Load balancer
  3. Horizontal scaling with a stateless tier
  4. Cache-aside
  5. Launch day
Scale Line — where this lesson sits

What you'll be able to do

  1. 1Explain why session state must leave the app servers before scaling out.
  2. 2Predict how many servers a target load needs, given per-server capacity and headroom.
  3. 3Spot when adding app servers stops helping because a shared dependency is saturated.

Inside the lesson

steps
7
questions
7
simulation
1

You guess first, then run the system and see if you were right.

More on the Scale Line

  1. Latency & percentilesOpen8 min
  2. Server capacity & scaling upFree with an account10 min
  3. Split app and database tiersFree with an account10 min
  4. Load balancerFree with an account10 min
  5. Cache-asideFree with an account10 min
  6. Object storage for user filesMembers10 min
  7. A CDN for the files everyone wantsMembers12 min
  8. Read replicas for a read-heavy appMembers11 min