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On 10/08/2018 06:14 AM, Florian Engelmann wrote:
> 3. HAProxy is not capable to handle "read/write" split with Galera. I 
> would like to introduce ProxySQL to be able to scale Galera.

Why not send all read and all write traffic to a single haproxy endpoint 
and just have haproxy spread all traffic across each Galera node?

Galera, after all, is multi-master synchronous replication... so it 
shouldn't matter which node in the Galera cluster you send traffic to.

-jay