project

Redis Sentinel

Monitoring process distributed with Redis that watches a primary, requires a quorum of peers to agree it is down, then elects a leader to promote a replica and tells clients which node is master.

Current clusters

build1 publisher

Fifteen deliberate primary kills put Redis Sentinel failover at down-after plus two seconds

A Docker lab that killed the primary fifteen times across Redis 8, Valkey 8 and Dragonfly found the outage tracking its down-after-milliseconds setting plus about two seconds of quorum vote and promotion.

Publishers:dev.to

Reality

Evidence58
Adoption20
Hype gap+15
Incentives35
Confidence55