Add DynamoDB zero-downtime migration tools - #163
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General-purpose zero-downtime table migration for DynamoDB using Streams, Export to S3, and conditional writes for conflict resolution. Package: tools/ddb_migration/ Components: - lambda/stream_replay.py: Stream replay with _migration_ts conflict resolution - glue/backfill_job.py: AWS Glue job for large tables (100+ GiB) - scripts/backfill.py: Standalone backfill for smaller tables - scripts/convergence_check.py: Pre-cutover verification - transform.py: Shared item transformation (customize for schema changes) - deploy.sh: One-command infrastructure setup - iam/policies.json: Least-privilege IAM templates (including cross-account) Use cases: - Migration to Global Tables with MRSC - Cross-account table migration - Key schema restructuring - Table consolidation Tested end-to-end with conflict resolution, tombstones, and MRSC strong consistency verification across 3 regions.
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Let me start by thanking you for this contribution! I'd love you had created an issue first so I could redirect you to the right place. We have a similar project i in the aws-dynamodb-examples repository. We moved the code to that repo because table migrations, in most of the cases, involve custom code, transformations, or particular requirements from customer to customer. Each migration becomes its own ecosystem with assumptions and tradeoffs that are related to each individual customer. I will review the PRs (since there are two about this now) and discuss internally with the team to decide if we move this to the Thanks! |
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General-purpose zero-downtime table migration for DynamoDB using Streams, Export to S3, and conditional writes for conflict resolution.
Package: tools/ddb_migration/
Components:
Use cases:
Tested end-to-end with conflict resolution, tombstones, and MRSC strong consistency verification across 3 regions.
Issue #, if available:
Description of changes:
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