TechPlanetScaleover 5 years ago
MySQL semi-sync replication: durability consistency and split brains
12 min read
MySQL semi-sync replication delays a primary's commit until a configured number of replicas persist the changelog. This improves durability but can reduce availability. Scenarios requiring higher-level intervention to avoid split brains are presented. The discussion covers MySQL 5.7 and the rpl_semi_sync_master_wait_for_slave_count setting.
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