Re: Hot standby, recovery infra

Heikki Linnakangas wrote:
> It looks like if you issue a fast shutdown during recovery, postmaster 
> doesn't kill bgwriter.

Hmm, seems like we haven't thought through how shutdown during 
consistent recovery is supposed to behave in general. Right now, smart 
shutdown doesn't do anything during consistent recovery, because the 
startup process will just keep going. And fast shutdown will simply 
ExitPostmaster(1), which is clearly not right.

I'm thinking that in both smart and fast shutdown, the startup process 
should exit in a controlled way as soon as it's finished with the 
current WAL record, and set minSafeStartPoint to the current point in 
the replay.

I wonder if bgwriter should perform a restartpoint before exiting? 
You'll have to start with recovery on the next startup anyway, but at 
least we could minimize the amount of WAL that needs to be replayed.

--   Heikki Linnakangas  EnterpriseDB   http://www.enterprisedb.com