Hi Jesus,
Unfortunately there is nothing built into MySQL replication that
would automatically dispatch queries based on query type.
The best alternatives I can think of is MySQL Cluster, or
perhaps EMIC.
Best wishes,
Lars
On Thu, Jan 20, 2005 at 09:21:09PM -0400, Jesus De Oliveira wrote:
> Hi,
>
> We're considering a cluster of four machines for a high availability and
> load balancing mysql database service, using replication to sync data
> along the cluster nodes. The client of this ha-database would be a J2EE
> app server, using container managed persistence of entity beans. The
> cluster software we're using is Linux Virtual Server, allowing the app
> server client to send his queries to a virtual IP address of the cluster,
> and dispatching each query to any of the cluster nodes.
>
> In this case, the developer has no control over which queries go to which
> nodes (because the nature of container managed persistence and connection
> pooling techniques), allowing for example a UPDATE send to a slave node
> (and as we know this would end up in a disaster).
>
> Is there a way to send all queries to the master server, and make him
> decide upon the query type if the query could be dispatched to one of the
> slaves? The main purpose is to have load balancing plus the high
> availability provided by the replication mechanism.
>
> The mysql cluster product satisfies this requeriment, and was evaluated
> but results really expensive due to the RAM needed to hold at least two
> replicas of our database of 20Gb.
>
> --
> Jesus De Oliveira
> Consultor IT
> Baysystem Consultores C.A.
> Tlf: (0212) 339.06.96
> (0414) 300.06.46
>
>
>
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--
Dr. Lars Thalmann
MySQL AB, www.mysql.com
