Database migration: Insights on Dual Read Write Strategy
summary
Migrating from MongoDB to YugabyteDB uses a dual read-write pattern with phased rollout: asynchronous dual writes, backfill of ~2 TB, then switch reads to YugabyteDB, then flip primary. Production recreates failures on a staging cluster by replaying Kafka to spawn parallel writers, revealing ~700 Postgres connections, load spikes and OOM killing tablet servers, so a server-side connection pooler (ODC collocated with nodes) is added and writes become synchronous for correctness. Final approach becomes a trickle migration with iterative milestones enforcing zero mismatches before cutover.
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chapters (10)
- 0:00Database migration journey
- 1:54Migration strategy
- 4:03Dual read-write framework
- 6:11Migration phases
- 9:22Production challenges
- 12:31Unmanaged connections
- 15:23Yugabyte staging cluster
- 16:26Data mismatch issues
- 17:34Trickle-down migration
- 18:43Dual read-write use cases
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