How is a canary different from shipping 100 percent of traffic at once?
PICTURE THIS: A REST CALL
Simple meaning
A full cutover exposes every user to unknown regressions immediately.
WHY — Canary Deploy instead of guessing?
Why interviewers care about Canary Deploy:
people who only read docs from people who shipped.
and tied to MLOps work.
Name the idea, why it exists, then one short example.
End with when you use it and one common pitfall.
STEPS — What happens step by step?
Before you speak the answer, walk the interviewer through these steps:
- 1A full cutover exposes
every user to unknown regressions immediately.
- 2A canary limits blast
radius and gives a live signal under real load.
- 3ML canaries also need
quality metrics, not only HTTP 500 rates.
- 4Give an example
One tiny concrete case you can say aloud.
- 5Common mistake
What juniors usually get wrong.
- 6Close
When you pick this over the alternative.
EXAMPLE — See it in action
Here's a short line you can speak, broken into clear beats:
Note: Adapt this scaffold to your own project — keep it under 60–90 seconds.
Key takeaway
A full cutover exposes every user to unknown regressions immediately. A canary limits blast radius and gives a live signal under real load.