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Re: MySQL Proxy: Scenarios
Posted by: Edwin DeSouza
Date: July 10, 2007 12:05PM

Gerry,
We like this:
"Turns out that MySQL Proxy is exactly the right tool for bringing load balancing to non-replication aware applications. So it will solve the load-balancing and HA as far as mysqld is concerned."

Can you help us understand more on:
"But what about HA for the proxy itself. I would have preferred that the proxy was an implementation of a VRRP router. This way it would take care of HA for itself automatically. The idea is that all upstream clients would use a VIP to address the proxy. You would install two proxies on different machines and assign one of these the VIP. Being a VRRP router the failover router would monitor the active router and if it could not make contact it would then take over the VIP and continue service for upstream clients. The upstream clients would never know that they had been switched to the failover proxy. So this is what MySQL Proxy needs for its own HA. Now I've only been working with MySQL Proxy for two days so maybe it has a way to do this that is transparent to upstream clients. The issue is that it is not enough that MySQL Proxy provide HA to mysqld. It must also make sure that it does not become a SPOF and therefore must provide HA for itself. In the alternative, I have been mapping out some ways that I could externally provide HA for MySQL Proxy but things get ugly quickly when you have to provide complete transparency to upstream clients."

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