Why it matters

Shadow reduces deployment risk. Understanding shapes safe ops.

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The architecture

Route request to old + new.

Return old to user.

Log both outputs.

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Shadow deploy flowTrafficuser requestsOld versionreturned to userNew versionshadow loggedAlso called 'dark launch'; validate with real traffic before serving
Shadow.
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How it works end to end

Log both outputs.

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Cost: 2x inference.

Progressive rollout after validation.