The Ultimate Guide to High Availability with MariaDB

4-Semi-Sync replication

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Semi-Synchronous Binlog Event

After the status byte of a binlog network stream, 2 bytes get added before the normal Binlog Event.

  • [ef] semi-sync indicator
  • semi-sync flags

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.

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