Zero downtime migrations at Petabyte scale

8 days ago

PlanetScale enables zero-downtime migrations for petabyte-scale databases.
Traditional database migrations involve risks like downtime, data loss, and version incompatibilities.
PlanetScale's migration process includes taking a non-locking snapshot, continuous replication, and verification steps.
The process allows for testing with production traffic and reversing migrations if needed.
Key steps include data snapshotting, replication, VDiff verification, and transparent traffic cutover.
PlanetScale uses Vitess and VReplication for efficient, fault-tolerant migrations.
The system supports sharding during migration to handle large-scale databases effectively.
Migrations can be reversed, providing flexibility and reducing risk.
The article provides a detailed technical breakdown of the migration process.

Hasty Briefsbeta