I recently needed to setup MySQL replication across 4 servers, so that each one is a slave of another.
After several hours of tweaking I finally got this working - it was actually quite simple. I am using MySQL 5.5.
What happens if one of the machines fails and the replication stops happening?
For instance, if there was a change on server 1, and server 3 failed during the change, the 4th machine will not know about the change.
What are possible scenarios to think about? How can I mitigate this issue?
