Rolling, Blue-Green, or Canary?
Compare rolling, blue-green and canary deployments. Which would you pick for a payments API, and what makes each one fail?
Practical scenario
A payments API deploys by rolling restart at 10am with a manual dashboard watch. The last bad release served every customer for eleven minutes before anyone noticed, and the rollback took another nine.
What it tests
Answer it out loud first. The guide below stays closed until you ask for it, on purpose.
- Whether the candidate knows the resource and rollback profile of each strategy
- Whether they connect the choice to blast radius and detection time
- Whether they know database migrations constrain all three
Reading a strong answer is not the same as producing one. Commit to what you would say, then compare.