4-Semi-Sync replication
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Regular MariaDB replication is asynchronous.
MariaDB, since MariaDB 5.5, has included the Semisynchronous Replication.
Semi-Synchronous Binlog Event
After the status byte of a binlog network stream, 2 bytes are added before the normal Binlog Event.
Note : The packet size, as in network protocol header, is then: event_size + 1 byte status + 2 bytes semi-sync replication
The SemiSync flag is SEMI_SYNC_ACK_REQ (0x01)
If the SEMI_SYNC_ACK_REQ flag is set the master waits for a Semi Sync ACK packet from the slave before it sends the next event.
The Semi Sync ACK sent by the slave (when requested) is
- uint<1> semi-sync indicator, always 0xef
- uint<8> the next position of received event
- string<EOF> binlog file name.
The master acknowledges this Semi Sync ACK with a OK_Packet or a ERR_Packet.
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