Mmastodon WorldImmigration first seen 17 h ago, last 38 min ago, peak #10
Shadow mode deployment urged as default software practice
Original: 🆕 Shadow mode as a default, not a luxury Run the new implementation beside the old on real traffic, with every side effe
Software engineer Richard Cooper argues that shadow mode — running a new implementation alongside the old one on real traffic with side effects suppressed — should be a standard practice rather than an optional extra. In a new article, he contends that contract tests can verify data shapes but only shadow mode proves actual behaviour, and he is calling on teams to adopt it by default when shipping risky changes.
Why now: The release of a new article advocating a change to common engineering deployment practices has sparked discussion among developers.
Richard Coopershadow modecontract testing
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Evidence
- 🆕 Shadow mode as a default, not a luxury Run the new implementation beside the old on real traffic, with every side effect suppressed. Contract tests prove the shape; shadow mode proves behaviour. Read it → https:// rj-cooper.co.uk/posts/shadow-m ode-as-a-default-not-a-luxury/… · RichardCooper@infosec.exchange · 4
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