A retail site wants to use a rolling procedure to release updated code across its multiple servers. The team plans to replace sections of servers one batch at a time and confirm reliability before moving on. Which deployment method best meets this requirement?
Deploy separate instances paralleling the current setup, then switch traffic after checks
Upgrade sets of servers in increments, verify each set, then continue until complete
Release the new version to a small fraction of traffic, then ramp up session handling
Install the updated feature on the servers in a single pass to keep them consistent
Incrementally upgrading subsets of servers and verifying each batch minimizes disruption. This strategy ensures that if issues arise, only a segment of the environment is affected, allowing a quick rollback. Other methods, such as standing up a duplicate environment (often referred to as a blue-green strategy), switching everything at once, or testing code on a small population first (often referred to as canary), do not align with the plan of modifying existing servers in carefully staged steps.
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