On Apr 21, 2008, at 12:31 PM, Michael Gruetzner wrote:

> Unfortunately the Slony documentation says nothing about that kind  
> of issue.

This is because slony doesn't offer any solution to make such a  
determination.  It leaves the problem of detecting failed nodes and  
reacting to them to the user.  Everyone has different business needs  
and network architecture, so it is very much a custom solution.