Damien Churchill wrote: > On 11 March 2011 12:04, Magnus Hagander <magnus@xxxxxxxxxxxx> wrote: > > On Fri, Mar 11, 2011 at 12:58, Damien Churchill <damoxc@xxxxxxxxx> wrote: > >> Hi there, > >> > >> I have done quite a bit of searching but have been unable to find any > >> way to do this. I am quite keen to use PostgreSQL 9.0's streaming > >> replication to create a master/slave write/read setup. However I am > >> unsure of an upgrade procedure whilst using streaming replication that > >> doesn't yield any downtime (including being able to write). From what > >> I have read the WAL won't be compatible between 9.0 and 9.1 so it > >> won't be possible to take the slave off-line and upgrade it, promote > >> it to master and then upgrade the old master. > > > > That's correct, you can'd do that. > > > > > >> So I was wondering if anyone knows of a method that allows you to do > >> this. Sorry if this is an often asked question and I just haven't been > >> able to find the answer. > > > > Using SR, the method will be to upgrade the master and then rebuild > > the slave off that one. You can upgrade with pg_upgrade, which will > > shorten your downtime, but there will be downtime. > > > > For a downtime-less upgrade, you will need to look at one of the > > "userspace replication solutions", like slony, bucardo, londiste etc. > > > > Thanks for the response! > > That's the conclusion I had come to as well, I thought it best to ask > in case there was a method I hadn't come across. Is anything planned > to allow SR to be used for downtime-less upgrades, or will using one > of the other replication solutions be the only way for the foreseeable > future? I don't know of any plans to allow downtime-less upgrades with streaming replication. -- Bruce Momjian <bruce@xxxxxxxxxx> http://momjian.us EnterpriseDB http://enterprisedb.com + It's impossible for everything to be true. + -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
