# SemiSyncReplication – block commit on a master until at least one slave acknowledges receipt of all replication events.
# MirroredBinlogs – maintain a copy of the master’s binlog on a slave
# TransactionalReplication – make InnoDB and slave replication state consistent during crash recovery
# UserTableMonitoring – monitor and report database activity per account and table
# InnodbAsyncIo – support multiple background IO threads for InnoDB
# FastMasterPromotion – promote a slave to a master without restart