Topic

Database failover

The promotion of a replacement write node when a database's primary fails or is taken out of service, covering candidate selection, topology updates and the window in which writes are blocked.

Current clusters

product1 publisher

Vitess v25 makes emergency failover wait only on the tablets that could win the election

Before v25, one surviving tablet that missed the relay-log deadline could fail an entire EmergencyReparentShard. Vitess says the new release filters that wait down to tablets sharing the leading history.

Publishers:vitess.io

Reality

Evidence60
Adoption20
Hype gap+12
Incentives65
Confidence62