> Replication rings are possible but you must design your application to
> take special care to NOT update the same row in multiple nodes of the
> ring at the same time. This is even harder to design and code for than
> splitting writes/reads to master/slaves.
>
> Also the loss of one node of a replication ring is not as easy to
> recover from as simply promoting one slave to become the new master of
> a replication tree (demoting the recovered former-master to become yet
> another slave) as there may be pending events in the relay logs of the
> lost node that have not yet been relayed to the downstream node.
>
> I may not have every answer, but I have seen nearly every kind of
> failure. Everyone else is encouraged to add their views to the
> discussion.
>

Has anyone used maatkit or Percona to setup circular replication? How
does it affect this system's reliability and robustness? Do the tools
help to deal with fail over?

W.

--
Wes Modes
Systems Designer, Developer, and Administrator
University Library ITS
University of California, Santa Cruz


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