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Traffic Splitting Vocabulary

5 questions · Progressive Delivery Language

1. A team configures their service mesh: "Route 90% of traffic to v1 and 10% to v2 using weighted routing." What is the correct term for this traffic splitting strategy?

Header-based routing Weighted round-robin routing User-cohort routing

2. An engineer says: "Internal testers can access the new version by adding the header X-Canary: true to their requests." What routing strategy is this?

Cookie-based routing Header-based routing IP-based routing

3. A team implements a "shadow traffic" setup for their new payment processing service. What does shadow traffic (also called traffic mirroring) mean?

Traffic from shadow users (internal employees) is routed to the new service for testing before external users are affected Real production requests are duplicated and sent to the new service in parallel — the new service processes them but its responses are discarded, affecting no real users Requests that fail on the new service are automatically shadowed back to the stable service to prevent user impact

4. A team runs an A/B test via traffic splitting: 50% of users see button variant A, 50% see variant B. What is the critical requirement for valid A/B test traffic splitting?

Equal traffic split — A/B tests are only valid if exactly 50% of users see each variant Consistent user assignment — the same user must always see the same variant across all their sessions, so that results are not contaminated by a single user experiencing both variants Geographic isolation — variant A and variant B must be deployed in different regions to prevent interference

5. An engineer describes a "dark launch" for a new recommendation engine. What distinguishes a dark launch from a standard canary deployment?

A dark launch deploys the new code at midnight to minimise user impact during the initial rollout In a dark launch, the new service runs and processes real requests in the background but its output is not shown to users — the system serves the existing results while secretly testing the new engine's output and performance A dark launch is a canary deployment restricted to users with dark mode enabled in their preferences

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