What deployment strategy allows for the simultaneous release of two versions of an application, directing a portion of the traffic to the new version and the rest to the current version to test performance and stability before full adoption?
A/B testing
Rolling deployment
Canary deployment
Blue/green deployment
The correct answer is 'Canary deployment'. Canary deployments are used to test the performance and stability of a new software version with a subset of users before rolling it out to all users. The term is derived from the 'canary in a coal mine' concept, where small, safe exposure to potential risk is monitored before proceeding further. Blue/green and rolling deployments, while viable strategies, do not use partial traffic routing for testing purposes. Instead, they provide full version replacement either instantly or incrementally across infrastructure. A/B testing, while involving traffic splitting, refers to a method primarily used to compare variations in user experience rather than software version stability.
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