I was reading over the replication discussion on maria-developers I thought I'd share some thoughts that are not so technical as I do not understand the back end that well. Our system is currently a master-master WAN replication setup, each writing to a different DB with an offline process to do copies. Our databases extensively uses auto-increments on tables (more than necessary, but that's another story). Would future developments allow synchronous replication to occur on a single database when the WAN link has a single point of failure(SPoF)? How might an auto-increment system handle such a failure? This SPoF is our network link that can be a transient problem out of our control. Both sides may need to keep inserting data during this transient issue. This is usually not an issue 99% of the time, but it's better to prepare for downtime than trying to fix data errors in that 1%.