Migrate Data Formats: Step-by-Step Production Guide
Migrate production data between formats: plan the migration, run a dual-write period, validate output, and cut over without downtime or data loss.
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Tags: data, migration, engineering
Migrate Data Formats: Step-by-Step Guide for Production Data Migrations Production data migrations fail for predictable reasons: the schema audit happens too late, there's no validation step before cutover, and there's no tested rollback path. This guide is a complete playbook — from auditing your existing format through running a dual-write period to cutting over cleanly. Every step has working code. --- The Migration Lifecycle A format migration has six phases. Skipping any one of them is how you end up doing emergency rollbacks on a Friday night. Audit — Understand exactly what you have Transform — Write and test the conversion script Validate — Run on a sample, measure error rate Dual-write — New format alongside old during transition Cutover — Switch readers to new format Rollback…
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