Glossary term
What is Replication lag? Meaning for developers
How far behind a replica is. Example: You update your bio, refresh, and see the old one.
Learn it properly · System DesignLesson 24: Database Replication: Leader, Follower and BeyondOne database server will eventually die, drown in reads, or be too far from your users. How leader-follower replication works, what replication lag does to real users, why failover is so hard, and how multi-leader and quorum systems handle conflicts.