Multi-Threaded Slave (MTS) & Logical Clock Parallel Applier

Multi-Threaded Slave (MTS) replication architecture that applies binlog events concurrently across multiple worker threads to eliminate replication lag.

Internal Architecture Breakdown

Legacy replication executed binlog events via a single SQL thread, creating inevitable replication lag behind multi-threaded primary hosts.

Modern MySQL Multi-Threaded Slaves (slave_parallel_type = LOGICAL_CLOCK) track transaction commit groups on the master to replay concurrent commits simultaneously across slave_parallel_workers on replicas, slashing replication lag to near-zero.

Production Inspection Queries

MySQL

SHOW SLAVE STATUS\G; -- Seconds_Behind_Master
SELECT * FROM performance_schema.replication_applier_status_by_worker;

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