Damien Churchill 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.
>
> 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.
Good question. I think you have to disconnect the slave, use pg_upgrade
to upgrade the master, and make a new slave. It is something we had not
considered. I don't think you can run pg_upgrade on the slave and have
it work.
--
Bruce Momjian <bruce@momjian.us> http://momjian.us
EnterpriseDB http://enterprisedb.com
+ It's impossible for everything to be true. +