> > Does it attempt any interaction with Slony when it detects a failure of the > > master? It would seem a pity to have pgpool watching the pair to detect > > failure but having to have a separate watcher process to tell Slony to > > failover. > > If pgpool detects PostgreSQL failure, Slony should detect it as well, no?
Others are much better place to answer this, but my understanding is that Slony does not do so: http://gborg.postgresql.org/project/slony1/genpage.php?howto_overview "What Slony-I is not: Slony-I is not a network management system. Slony-I does not have any functionality within it to detect a node failure, or automatically promote a node to a master or other data origin. Slony-I is not multi-master; it's not a connection broker, and it doesn't make you coffee and toast in the morning." > pgpool 2.5 has the capabilty to perform periodical health checking to > PostgreSQL. Since pgpool has this capability, how about including a hook that allows a script to be run when pgpool detects a problem with the master? That would allow action to be taken to investigate further and, if required, switchover or failover and promote the slave to master. Julian Scarfe ---------------------------(end of broadcast)--------------------------- TIP 6: Have you searched our list archives? http://archives.postgresql.org
