Mix of Cyclic and Chained MySQL replication - What do you do with "log-slave-updates"..?
Well, you are absolutely right to be concerned about log-slave-updates causing an issue with your Master-Master setup, though it won't necessarily be an infinite loop changes. I suspect if you are writing to both masters, that you will constantly be having to set skip_slave_counter and restart the slave thread.... In a word, not ideal.

I would look over this post, specifically the short section on data integrity:


  The safest solution is to simply never write data to both masters.


So, if both master's are up, but your clients only ever write to one master at a time (Master 1 by default), then you shouldn't have an issue.


*shouldn't doesn't mean you won't, though.