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Displaying posts with tag: MySQL ring replication (reset)
MySQL ring replication: Why it is a bad option

I’ve recently worked with customers using replication rings with 4+ servers; several servers accepting writes. The idea behind this design is always the same: by having multiple servers, you get high availability and by having multiple writer nodes, you get write scalability. Alas, this is simply not true. Here is why.

High Availability

Having several servers is a necessary condition to have high availability, but it’s far from sufficient. What happens if for instance C suddenly disappears?

  • The replication ring is broken, so updates from A and B will never go to D. D will then quickly become so out-of-date that it’s not going to be usable. But wait! A will no longer receive the updates from B so A …
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