Parallelizing User Migrations Safely at Scale
Parallelizing User Migrations Safely at Scale

Parallelizing User Migrations Safely at Scale

Author
Shiv Bade
Tags
parallelism
migrations
scalability
Published
January 6, 2016
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At high volumes, user migrations need to be parallel — but safe.
Key issues: - Avoiding race conditions and overloading partitions - Coordinating steps across services - Respecting dependencies and consistency
Techniques: - Partition-level concurrency caps - Leases with TTL to avoid duplicate execution - Rate-limited task queues and failure queues
Diagrams helped explain coordination strategies to teams.