Dual Write - CI/CD Glossary Definition
A dual write writes to both old and new schema at once during a migration, keeping both current until cutover.
A dual write has application code write to both the old and new schema (or store) at once during a migration, so both stay current until the cutover.
Dual writes bridge the expand and contract phases; they let a team backfill and verify the new shape before making it the source of truth.
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