migration-patterns

Name: migration-patterns
Rating: 5 (2 reviews)
Author: atuljha23

Safe schema-migration patterns for systems under live traffic, including expand/contract, backfill, double-write, shadow-read, and online DDL. These patterns are used when authoring, reviewing, or sequencing a migration that cannot take a maintenance window.

2stars

Updated 2 months ago

View on GitHub ↗License: MIT

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Migration patterns

Assume: the service is running, writes are arriving, you cannot take a maintenance window. Most production migrations live here.

The universal rule

Never couple a schema change to a code change in the same deploy. They fail independently, and you need each to be reversible independently.

Expand → Migrate → Contract

The safe three-phase dance for any non-trivial change:

Expand — add the new shape alongside the old. No caller depends on it yet.
**Migr

[Description truncada. Veja o README completo no GitHub.]

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