InfoQ - Database Replication - News

Cursor Uses S3 WAL to Scale Git Storage to More than 300 Pushes per Second

Leela Kumili — Wed, 30 Sep 2026 13:47:00 GMT

Cursor has introduced Continuity, a Git storage architecture that uses an S3 backed write ahead log as the source of truth. The design turns local NVMe repositories into warm caches and separates replica coordination from consistency. Cursor reports linear read scaling with up to 100 replicas and more than 300 pushes per second with S3 Express One Zone in synthetic tests.

By Leela Kumili

Uber Redesigns M3DB Sharding with Subclusters to Limit Failure Impact

Leela Kumili — Mon, 21 Sep 2026 14:37:00 GMT

Uber has redesigned shard placement in M3DB with fixed size subclusters to limit the impact of node failures, maintenance, and cluster scaling. The approach bounds shard dependencies, preserves replica isolation, and uses a greedy algorithm to select shard migrations while avoiding a separate rebalancing pass and unnecessary data movement.

By Leela Kumili