Comment 4 for bug 307407

For this issue, there is no need for configuration apart from specifying what the threshold is - the appservers will switch over to master-only mode when this threshold is reached.

I think it would be useful to easily change what database is used for the master and slave. However, I think this is better done using a connection pool like pgbouncer or pgpool rather than attempt to code this logic ourselves. This approach will work for batch processes as well as the web app.