On Fri, Feb 25, 2011 at 8:40 AM, Greg Smith <g...@2ndquadrant.com> wrote: > I didn't get the Streaming Rep + Hot Standby features I wanted in 9.0 either. > But committing what was reasonable to include in that version let me march > forward with very useful new code, doing another year of development on my > own projects and getting some new things get fixed in core. And so far it > looks like 9.1 will sort out all of the kinks I was unhappy about. The same > sort of thing will need to happen to get Sync Rep committed and then > appropriate for more use cases. There isn't any margin left for discussions > of scope creep left here; really it's "is this subset useful for some > situations and stable enough to commit" now.
I mostly wanted to raise the issue to not be a blocker, but an attempt to avoid boxing ourselves in for growing such a feature in 9.2. if 9.1 ships with the syncrep patch as-conceived, it'll just mean that it'll be hard/not possible to offer syncrep to users as well as at the "infrastructure service provider" level...which is, actually, quite fine -- most current users likely don't want to take the performance hit of syncrep all the time, but to live with it during a switchover is quite fine. I just wanted to make a reasonable effort to ensure its possibility in a 9.2-like timeframe. >> 2. The unprivileged user can disable syncrep, in any situation. This >> flexibility is *great*, but you don't really want people to do it when >> one is performing the switchover. > > For the moment you may have to live with a situation where user connections > must be blocked during the brief moment of switchover to eliminate this > issue. That's what I end up doing with 9.0 production systems to get a > really clean switchover, there's a second of hiccup even in the best case. > I'm not sure yet of the best way yet to build a UI to make that more > transparent in the sync rep case. It's sure not a problem that's going to > get solved in this release though. I'm totally okay killing all backends during the switchover between 9.1 and 9.2 releases, unless I get super clever with pgbouncer...which I will have to do anyway. -- fdr -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
