Planned lessonMID-033-L07

Demo: a cascading failure, then the fix

On This Lesson 3 topics

This lesson is planned. The outline below lists the topics it will cover. The full lesson has not been published yet.

In this lesson

break checkout with a slow payments, then contain it. Prepares MID-033-LAB1.

Draft outline details

Put Toxiproxy between orders and payments; run a load test on checkout and on GET /products.
Add 5 s latency to the proxy: checkout hangs and product listing also slows as the pool fills.
Add a 500 ms read timeout on the payments client; checkout fails fast but still hammers payments.
Add a circuit breaker and a bulkhead for payments; repeat: failures are fast, product listing stays healthy.
Planned mistake: configure the breaker to count 400 responses as failures; it opens on validation errors. Fix: record only timeouts and 5xx.
Remove the latency and watch the breaker go half-open, then closed.

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