Tue Oct 30 03:23:49 PDT 2007
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Hi, I'm trying to wrap my head around Slony-I and how to use it from an application server like JBoss with Hibernate. I'm not clear on the relationship between actual connections established by a client and nodes in the cluster. Is it true that any connection that is established is either connected to a slave or to the master (origin) for a specific replication set? I.e. there's no node in between that will redirect updates to the master for the replication set in question? I'm trying to figure out how to do a controlled switchover and the implications of doing that. My appservers can work with two different connections if needed but it will be somewhat cumbersome if they need to change their settings when I do a switchover. Is there a way to do switchover and maintain the connection settings (i.e. host, database, credentials)? Ideally, the connections should survive the switch. I'm also looking into automatic switchover in case the master fails for some reason. The Heartbeat product seems to be useful for this. Are you aware of any examples on how to do this? Any pointer or hint would be useful. Kind Regards, Thomas Hallgren
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