Tag
zero-downtime
- Feb 21, 2025 Connection Draining and In-Flight Request Handling at Cutover How an instance retires without dropping requests: deregistration order, keep-alive reuse, TCP and TLS teardown, and the timers that decide whether clients see errors. devops
- Dec 19, 2024 Blue-Green Cutover Mechanics at the Routing Layer Where the traffic switch actually happens, why DNS record changes make poor cutover levers, and what the standby fleet must be able to carry before and after the switch. devops
- Mar 12, 2024 Expand and Contract: Changing a Column While Both Versions Run The four-step sequence that lets old and new application code share one schema, which intermediate states must be safe, and where the sequence breaks down. databases
- Jun 10, 2022 Expand and Contract: Schema Changes That Survive an Overlap The three-phase pattern that keeps two application versions reading one schema, which DDL operations take heavy locks, and how to bound the lock window with batched backfills. devops